Four DMOS Low-side Relay Drivers with Current Limitation Gate Driver E

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Four DMOS Low-side Relay Drivers with Current Limitation Gate Driver E

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Driver Stages
Four DMOS Low-side Relay Drivers with Current Limitation Gate Driver External N-channel with Charge Pump Bootstrap Universal Outputs High Side Side) Warning Lamp Driver Power Supplies 5V/150 Linear Regulator 5V/30 Linear Regulator (also Active Standby Mode) Internal Power Supply Switchable System Supply Voltage Output Monitoring Protection Monitoring Watchdog with Reset Comparators Current Measurement Adjustable Undervoltage Warning Level Overtemperature Protection with Hysteresis Comparators Wide Supply Voltage Range from 5.8V 8-bit Interface Current Consumption Standby Mode CMOS Compatible Inputs Protection Transient Protection According ISO/TR 7637-1 Level (Except Load Dump)
Automotive Failsafe System ATA6842
Applications
Automotive Failsafe System ATA6842 ideal driver monitoring functions ambitious solutions with increased safety requests such parking brakes, power steering, other applications with motor control.
4964B-AUTO-07/07
Description
ATA6842 monolithically-integrated multi-functional designed Atmel state-of-the-art BCDMOS technology. With built-in driver stages, voltage supplies monitoring functions, ideal cost saving failsafe system communication with external microcontroller provided 8-bit interface. Four protected current limited driver stages available control relays additionally there gate driver including charge pump bootstrap control external FET. Three LEDs status information controlled three separate outputs: high-side driver OUTP monitoring functions overcurrent current threshold. low-side drivers pins OUTN also have monitoring functions overcurrent, current threshold, voltage monitoring. internal bandgap references control monitor independent supply voltages. standby mode internal IC-supply provided them; other switched off, order reduce power consumption minimum. internal blocks supplied specific internal voltage regulator. system supply voltage internally-generated voltages monitored case over undervoltage drivers switched off. system supply voltage switched provide power external components. battery voltage monitored adjustable monitoring function. oscillator with external circuitry fully-integrated auxiliary oscillator which RREF clock references watchdog other time constants. Both oscillators monitor each other. independent watchdog circuitry monitors microcontroller's correct operation. differential amplifiers support external converters current measurement. comparators provided monitor supply external devices like sensors. ATA6842 improved version successor ATA6814. function compatible ATA6842 replacement applications. ATA6842 offers flawless performance reference requests some automotive customers regarding very slow supply voltage ramps downs.
ATA6842
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ATA6842
Figure 1-1. Block Diagram
OUTN OUTP
Battery undervoltage monitor Over/ CtrL undervoltage monitor CtrL
Universal lowside Driver CtrL
Universal lowside Driver CtrL
Universal highside driver CtrL
CtrL
Highside gate driver with charge pump
TCFET
CtrL
Lowside driver
V12S EK15
switch
CtrL
Lowside driver
Control Logic
8-Bit CtrL
(CtrL)
CtrL Bandgap reference CtrL Overtemperature monitor CtrL CtrL CtrL
Lowside driver
Enable
Lowside driver
Internal voltage regulator Main voltage regulator Auxiliary voltage regulator Watchdog oscillator
Current measurement comparator Current measurement comparator Voltage monitoring comparator Voltage monitoring comparator
B1CI B1CG B1CO B2CI B2CG B2CO
Voltage monitoring
CtrL Fully integrated main oscillator
CtrL
CtrL Bandgap reference
RCOS RSTN RESAN RESN
IREF
CtrL
CtrL
Watchdog with reset function
CtrL
Current bias blocks
Test
RREF
TEST
4964B-AUTO-07/07
Figure 1-2.
DK30
Application Circuit
K30P K15ext
CK30
STD1802
QU5A BC817-40 CV5A
DWLN RWLN
DOUTN ROUTN
ROUTP DOUTP
DK15
RUVM
OUTN
V12S
OUTP TCFET CBS1 CBS2 RTC1 RTC2
RUV1 RUV2
MTCFET1
K30P
RCOS
RREF RREF EK15 RSTN RESAN GNDA GNDL TEST GNDP B2CO B2CG RL24 B2CI RL23 RL22 RL25 0.01 RL21 MR34 K30P RESN B1CO B1CG RL14 MTCFET2 B1CI RL13 RL12 RL15 0.01 RL11 MR12
ATA6842
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ATA6842
Configuration
Figure 2-1. Pinning QFN48
B2CG B2CI B2CO B1CG B1CI B1CO GNDL OUTN GNDP V12S OUTP
ATA6842
RCOS EK15 TEST GNDA RREF RESN RSTN
Table 2-1.
Description
Symbol RSTN RESN RREF GNDA TEST EK15 RCOS GNDL B1CO B1CI B1CG Function Reset input Reset output Reference resistor Analog ground Undervoltage reference input Test Undervoltage measurement input Enable (K15 based) Enable based) Resistor-capacitor oscillator Chip-select input Clock input Data input Data output External voltage regulator output Comparator output Logic ground Comparator output Bridge current output Bridge current input Bridge current ground
TCFET RESAN
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Table 2-1.
Description (Continued)
Symbol B2CO B2CI B2CG OUTN GNDP V12S OUTP TCFET RESAN Function Bridge current output Bridge current input Bridge current ground Comparator input Low-side driver output Comparator input Relay driver output Relay driver output Power ground Relay driver output Relay driver output switch supply voltage High-side driver output Warning lamp output Test current Bootstrap capacitor Internal supply supply Base supply Auxiliary supply Base auxiliary supply Enable relay driver input Warning lamp polarity input Watchdog trigger input Undervoltage warning output Auxiliary reset output
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ATA6842
Absolute Maximum Ratings
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. This stress rating only functional operation device these other conditions beyond those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Parameters Supply voltage Supply voltage Voltage pins CLK, ERD, WDT, WLP, CSN, RSTN, VRE, C1O, C2O, RESN, RESAN, UVR, UVW, RREF, TEST, B1CI, B1CG, B1CO, B2CI, B2CG, B2CO, RCOS Current pins CLK, ERD, WDT, WLP, CSN, RSTN, VRE, C1O, C2O, RESN, RESAN, UVR, UVW, RREF, TEST, B1CI, B1CG, B1CO, B2CI, B2CG, B2CO, RCOS Voltage RD1, RD2, RD3, RD4, WLN, OUTN, OUTP, EK15, BSC, TCFET, Current RD1, RD2, RD3, RD4, WLN, OUTN Current OUTP Voltage Current Current Voltage V12S Current V12S protection pins MIL-STD-883, Method 3015, discharged through Operation Peak Condition Symbol Min. -0.3 -0.3 Max. Unit
0.3V
-0.3
+5.5
Vd() Tj,op Tj,peak
-0.3 -150 -0.3 -150 -0.3
+150 +5.5
Junction temperature Storage temperature
+150 +165 +125
Thermal Resistance
Parameters Operating ambient temperature range Thermal resistance, chip case Soldering temperature Condition Symbol Tamb RthJC Min. Max. +105 Unit
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Electrical Characteristics
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters Total Device functions Reduced operation mode(1) Standby, 14V, I(V5A) WLN, OUTN, OUTP, V12S, RSTN RSTN CLK, ERD, CLK, ERD, RSTN CLK, ERD, WDT, CLK, CSN, ERD, RSTN, WDT, CLK, CSN, ERD, RSTN, WDT, Vt()hys Vt()hi Vt()lo CLK, CSN, ERD, RSTN, WDT, C1O, C2O, VRE, RESAN, RESN, I(V12) I(V12) Ilk()lo,stb Ilk()hi,stb I(V5) I(V5A) Ipu() Ipu() Ipu() Ipu() Ipd() Ipd() Ipd() Ipd() Vpu() Vpu() Vpd() -100 -100 -200 -200 -0.6 -0.6 Permissible supply voltage Supply current Supply current Test Conditions Symbol Min. Typ. Max. Unit Type*
Leakage current V12, Leakage current high Supply current Supply current V12, V(BSC) based pins open RESAN open
Pull-up current Pull-up current 1.10 Pull-up current 1.11 Pull-up current 1.12 Pull-down current 1.13 Pull-down current 1.14 Pull-down current 1.15 Pull-down current
Vpu() 1.16 Pull-up voltage 1.17 Pull-up voltage 1.18 Pull-down voltage Input threshold voltage high Input threshold voltage Input hysteresis voltage Saturation voltage Vpu()
1.19
Vt()hi
1.20
Vt()lo
0.85
1.21
Vt()hys
1.22
outputs
Vs()lo
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
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ATA6842
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters 1.23 Saturation voltage Saturation voltage high Saturation voltage high Saturation voltage high Saturation voltage high Test Conditions outputs Vs() V(), -0.1 outputs high Vs() V(), -0.1 RESAN high Vs() V(), -1.6 outputs high Vs() V(), -1.6 RESAN high Cload from high Cload from high Cload from high Cload from high off, pins V5A, RESAN C1O, C2O, VRE, RESAN, RESN, C1O, C2O, RESN, RESAN C1O, C2O, RESN, RESAN C1O, C2O, RESN, Symbol Vs()lo Min. Typ. Max. Unit Type*
1.24 1.25 1.26 1.27
Vs()hi Vs()hi Vs()hi Vs()hi
1.28 Rise time
tr()
1.29 Rise time
RESAN
tr()
1.30 Fall time
C1O, C2O, RESN,
tf()
1.31 Fall time 1.32 Leakage current 1.33 1.34 Short circuit current Short circuit current Short circuit current high Saturation voltage high Saturation voltage high Short circuit current
RESAN C1O, C2O, RESN, RESAN C1O, C2O, VRE, RESAN, RESN,
tf() I()lk Isc()lo Isc()lo
1.35
pins high Vs() V(), -0.1 high Vs() V(), -1.6 high Cload from high Cload from high
Isc()hi
1.36 1.37 1.38
Vs()hi Vs()hi Isc()lo
1.39 Rise time
tr()
1.40 Fall time
tf()
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
4964B-AUTO-07/07
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters Bandgap, Bias RREF Overcurrent WLN, OUTN OUTP Overcurrent WLN, OUTN OUTP RREF V(RREF) 1.18 1.23 1.28 Temperature Monitoring Thermal shutdown temperature Thermal re-entry temperature Thermal shutdown temperature Thermal re-entry temperature Enable/Standby EK15 EK15 EK15 EK15 EK15 RiEK15 VEK15on VEK15off VEK15hys te(EK15) Upper enable threshold Lower enable threshold T1off T1on T1hys T2off T2on T2hys Voltage RREF Test Conditions Symbol Min. Typ. Max. Unit Type*
Thermal hysteresis T1hys T1off T1on
Thermal hysteresis T2hys T2off T2on Input resistor
Enable hysteresis Enable time based watchdog oscillator period Voltage Monitoring Lower undervoltage threshold Upper undervoltage threshold Undervoltage hysteresis Lower overvoltage threshold Upper overvoltage threshold Overvoltage hysteresis Under/overvoltage filter time VtOhys VtOhi VtOlo VtUhys VtUhi VtUlo
VtUlo VtUhi VtUhys VtOlo VtOhi VtOhys
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
ATA6842
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ATA6842
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters Linear Regulator I(V5) -150 Uce,sat(NPN) 0.8V, Ube(NPN) 0.8V -40°C, Ube(NPN) 0.7V 27°C, Ube(NPN) 0.6V 105°C 18V, I(V5) -150 14V, I(V5) -150 Test Conditions Symbol Min. Typ. Max. Unit Type*
Output voltage
4.85
5.15
Line regulation Load regulation Allowed capacitor Allowed capacitor 6.10 6.11 Lower threshold undervoltage Upper threshold undervoltage Lower threshold overvoltage Upper threshold overvoltage Hysteresis Under/overvoltage Under/overvoltage filter time
V5lir V5lor ESR,CV5 VtU(V5)low VtU(V5)hig VtO(V5)low VtO(V5)hig Vt(V5)hys tfi(V5) Isc(B5) Rpd(B5) Ipd(B5)
RESN RESN high RESN high RESN
6.12 Short circuit current 6.13 Pull-down resistor 6.14 Pull-down current
V(B5) V(B5) V(B5) Vs(B5) V(B5), 5.8V 6.5V, I(B5) -1.25 -40°C 27°C 105°C
6.15
Saturation voltage high
Vs(B5)high
0.15 0.25 0.35
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
4964B-AUTO-07/07
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters Test Conditions I(V5A) 200, Uce,sat(NPN) Ube(NPN) 0.8V -40°C, Ube(NPN) 0.7V 27°C, Ube(NPN) 0.6V 105°C 18V, I(V5A) 14V, I(V5A) Symbol Min. Typ. Max. Unit Type* Auxiliary Linear Regulator
Output voltage
4.65
5.35
Line regulation Load regulation Minimum capacitor Minimum capacitor Lower threshold undervoltage 7.10 7.11 Upper threshold undervoltage Lower threshold overvoltage Upper threshold overvoltage Hysteresis under/ overvoltage Under/overvoltage filter time
V5Alir V5Alor CV5A ESR,V5A VtU(V5A) VtU(V5A) high VtO(V5A) VtO(V5A) high Vt(V5A) tfi(V5A) Isc(B5A) Rpd(B5A) Ipd(B5A)
RESAN RESAN high RESAN high RESAN
standby mode V(B5A) V(B5A) V(B5A) Vs(B5A) V(B5A), 5.8V 6.5V, I(B5A) -150 -40°C 27°C 105°C
7.12 Short circuit current 7.13 Pull-down resistor 7.14 Pull-down current
7.15
Saturation voltage high
Vs(B5A)
0.35 0.45 0.55
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
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ATA6842
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters Test Conditions C(VI) I(VI) RESN RESN high RESN high RESN Symbol Min. Typ. Max. Unit Type* Internal Voltage Supply I(BxCO) BxCO I(BxCO) -750 BxCO high, Vs(BxCO)hi V(BxCO) BxCO low, V(BxCO) BxCO high, V(BxCO) BxCO VtUlo VtUhi VtOlo VtOhi VtUhys VtOhys Isc() Vs()lo 4.35 5.35
Output voltage Lower threshold undervoltage Upper threshold undervoltage Lower threshold overvoltage Upper threshold overvoltage Hysteresis undervoltage Hysteresis overvoltage
Short-circuit current Output voltage
Current Measurement,
Saturation voltage
BxCO
Vs()hi
Short-circuit current Short-circuit current high
BxCO BxCO
Isc()lo Isc()hi
-2.5
Vos() V(BxCI) V(BxCG) Input offset voltage -40°C V(BxCO) (V(BxCI) 27°C V(BxCG)) 105°C Leakage current Input voltage range V(BxCI), V(BxCG) Difference leakage -0.7V +0.35V, current dIlk(BxCI, BxCG), V(BxCI), V(BxCG) -0.7V +0.35V
BxCO
Vos()
-3.5 -3.5 -1.75 -0.7
+3.5 +3.5 -0.25 +0.35
BxCI BxCG BxCI BxCO B1CI, B1CG B2CI, B2CG
Ilk() Vi()
dIlk()
-0.25
+0.25
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
4964B-AUTO-07/07
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters Test Conditions I(RDx) Toff -40°C 27°C 105°C V(RDx) V12, Toff V(RDx) 40V, Toff I(RDx) high, 0.2H ±1%, ±1%, ±1%, I(WLN) V(WLN) V12, Symbol Min. Typ. Max. Unit Type* Relay Driver RDx, Saturation voltage 10.1 Short circuit current
Vs()lo
10.2
Isc()lo Ilk() Vf()
10.3 Leakage current 10.4 Free-wheeling voltage
Watchdog 11.1 Upper window time 11.2 Lower window time 11.3 Watchdog timeout Warning Lamp 12.1 12.2 12.3 Saturation voltage Short-circuit current Threshold current high V(WLN) 40V, high I(WLN) Isc(WLN)lo, T1off V(WLN) from high I(WLN) high, Vs()lo Isc()lo Ith()hi Ith()lo Ithhys Vth() Ilk() tfi() tf() Vf() 0.25 2.25 2.75 Tu(WDT) Tl(WDT) Tt(WDT) 22.2 16.4 59.7 24.6 64.6 19.8
12.4 Threshold current Hysteresis threshold 12.5 current 12.6 Threshold voltage detection
12.7 Leakage current 12.8 Overcurrent filter time 12.9 Fall time 12.10 Free-wheeling voltage
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
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ATA6842
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters Reset 13.1 Reset pulse duration 13.2 Reset pulse duration Low-side Driver OUTN 14.1 14.2 14.3 Saturation voltage Short-circuit current Threshold current high Hysteresis threshold current Threshold voltage detection V(OUTN) 40V, OUTN high I(OUTN) Isc(OUTN)lo, T1off V(OUTN) from high I(OUTN) OUTN high, Vs(OUTP) V(OUTP), I(OUTP) OUTP high, Toff V(OUTP) OUTP high I(OUTN) OUTN low, Toff V(OUTN) V12, OUTN OUTN OUTN OUTN OUTN OUTN OUTN OUTN OUTN OUTN OUTN Vs()lo Isc()lo Ith()hi Ith()lo Ithhys Vth() Ilk() tfi() tf() 0.25 2.25 2.75 RESN RESAN tl(RESN) tl(RESAN) Test Conditions Symbol Min. Typ. Max. Unit Type*
14.4 Threshold current 14.5 14.6
14.7 Leakage current 14.8 Overcurrent filter time 14.9 Fall time 14.10 Free wheeling voltage
High-side Driver OUTP 15.1 Saturation voltage high OUTP Vs()hi
15.2 Short-circuit current 15.3 Threshold current high Hysteresis threshold current
OUTP OUTP OUTP OUTP
Isc()hi Ith()hi Ith()lo Ithhys Ilk() tfi() tr()
15.4 Threshold current 15.5
-0.1
15.6 Leakage current 15.7 Overcurrent filter time 15.8 Rise time
V(OUTP) V12, OUTP I(OUTP) Isc(OUTP)hi, T1off V(OUTP) from high
OUTP OUTP OUTP
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
4964B-AUTO-07/07
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters Test Conditions ±1%, reset, 1/(2 COS) Symbol Min. Typ. Max. Unit Type* Watchdog Oscillator RCOS 16.1 Oscillator frequency 16.2 Permissible frequency range RCOS RCOS RCOS RCOS RCOS RCOS fOSC fOSC Isc()lo Ilk()
16.3 Permissible resistor Short-circuit current
16.4 Permissible capacitor 16.5 V(RCOS) V(RCOS) 63.2%
16.6 Leakage current Main Oscillator 17.1 Main oscillator frequency Threshold voltage detection
RREF
fmosC
82.5
Comparator Cxl, 18.1 V(CxI) dv/dt 1V/µs Vo(TCFET) V(TCFET) V12, 6.5V, I(TCFET) V(BSC) Vd() V(BSC) V(TCFET), TCFET high, I(TCFET) TCFET low, I(TCFET) V(TCFET) TCFET high V(TCFET) V12, TCFET V(BSC) 36V, TCFET Vth(CxI) Ilk(CxI) tpd(Cx) 1.23
18.2 Leakage current 18.3 Propagation delay TCFET 19.1 Output voltage Short-circuit current high Saturation voltage high Saturation voltage Short-circuit current high Short-circuit current
TCFET
Vo()
19.2
Isc(BSC)hi
19.3
Vs()hi
19.4 19.5 19.6
TCFET TCFET TCFET
Vs()lo Isc()hi Isc()lo Ilk() -250
19.7 Leakage current
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
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ATA6842
Electrical Characteristics (Continued)
Operating conditions: 6.5V 26V, ±3%, RREF ±2%, -40°C 150°C, unless otherwise specified. Parameters V12S Switch 20.1 Saturation voltage high Short-circuit current high Vs(V12S) V(12S), V12S high, T2off, I(V12S) V(V12S) V12S high V(V12S) V12, V12S V12S Vs()hi 0.36 Test Conditions Symbol Min. Typ. Max. Unit Type*
20.2
V12S V12S
Isc()hi Ilk()
-150
20.3 Leakage current
Voltage Monitoring 21.1 Input voltage range 21.2 Threshold V(K30, UVM) R(K30, UVM) Vir(UVR) Vt(K30, UVM) Ri(UVM) Vt(UVR) Ilk(UVR) Ilk(UVM) 0.02 0.06
21.3 Input resistor Undervoltage reference hysteresis 21.4 based V(K30, UVM) 21.5 Leakage current 21.6 Leakage current V(UVR) V(UVM) V12, standby
Type means: 100% tested, 100% correlation tested, Characterized samples, Design parameter Note: Reduced operation mode means either RDSON drivers could higher than specified Voltage TCFET could beyond specified limits
Operating Conditions: Interface
5.8V 26V; Tamb -40°C 105°C Parameters Cycle time cycle time High cycle time Setup time: stable before high Hold time: stable after high Access time: stable after high Valid time: stable before high Symbol tcycle tcycle,lo tcycle,hi tsetup thold taccess tvalid Min. Max. 12.5 Unit
4964B-AUTO-07/07
Functional Description
Bandgaps
voltage monitoring references various voltage regulators, independent bandgaps used. bandgaps generation monitoring internal supply V5A) used cross-over mode.
Bias
external resistor RREF defines current reference blocks determines main oscillator frequency. current through external resistor monitored case malfunction (pin open short ground; current less than 0.25 times greater than times nominal value), bias failure detected (see Table page 25).
Temperature Monitoring
protect circuit from extensive temperature error condition, temperature levels implemented switch various blocks. lower temperature level, outputs WLN, OUTN OUTP switched after debounce time, corresponding driver current limitation. Warning Lamp switched above upper temperature level. other drivers linear regulators will switch off. temperature level falls below shutdown temperature (hysteresis), drivers except TCFET relay drivers will their previous state.
Enable/Standby
power consumption ATA6842 reduced minimum inputs EK15 (sleep mode). With signal command, inputs EK15 overwritten ATA6842 will stay active (keep-alive function). status EK15 read SPI.
Table 7-1.
High
Enable/Standby Table
EK15 High (SPI) High ATA6842 Active Active Active Standby
Voltage Monitoring
system supply checked overvoltage undervoltage internal voltage divider. voltage exceeds limits, drivers switched reset RESN RESAN generated (see Table page 25).
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Linear Regulators
ATA6842 offers independent supplies. main supply (V5) available only active mode while auxiliary supply (V5A) active time. ATA6842 activates basis external bipolar transistors pins B5A. currents regulators (150 mA), defined datasheet, only achieved external transistors fulfil certain requirements terms current amplification transit frequency. Especially 5.8V saturation voltage combination with forward diode voltage saturation voltage (Uce,sat) external bipolar transistors required. fast load changes high transit frequency necessary (typically MHz). voltage monitoring references voltage regulators independent bandgaps used. voltage monitoring functions generate reset pulse RESN RESAN limits exceeded (see Table page 25). internal voltage supply, additional linear regulator (VI) implemented.
Current Measurement
ATA6842 contains differential amplifiers current measurement. input signal each amplifier voltage drop over external current sense resistor. amplification, defined ratio external resistors, provides reasonable signal following converter. output limited
Relay Driver
ATA6842 features four current-limited relay drivers motor direction control relays. relays controlled command input enable relay driver (ERD). Error conditions disable relays permanently (see Table page 25). Table 7-2.
High High
Relay Status Table
TRD2 (SPI) High High High High High Open drain Open drain Open drain Open drain Open drain Open drain Open drain Open drain
TRD1 (SPI)
Table 7-3.
High High Note:
Relay Status Table
TRD4 (SPI) High High High High High Open drain Open drain Open drain Open drain Open drain Open drain Open drain Open drain
TRD3 (SPI)
simultaneous activation relay drivers possible (see Table Table 7-3). This feature ensures that ATA6842 used motor application, motors only operate same direction.
4964B-AUTO-07/07
Watchdog
open loop watchdog (window comparator) compares each time interval between falling rising edge with given reference time interval. lower window time between upper window time between (tWD 2/fOSC). watchdog includes error counter WDC(2:0) which incremented when there valid trigger events decremented three when there watchdog errors. counter reaches value zero (state 000), warning lamp will switched Relay drivers, TCFET-, low- high-side drivers disabled. With counter value greater than equal seven (state 111), watchdog stops affecting drivers. case watchdog timeout (322 tWD), error counter immediately zero. initial state watchdog counter after power-up RESN (state S6). watchdog reset RSTN. Figure 7-1. State Diagram
good
timeout good good timeout good
timeout
timeout
good
timeout timeout
timeout
good
good
good
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ATA6842
7.10 Warning Lamp
ATA6842 features watchdog-controlled output, WLN, which used switch warning lamp. Depending warning lamp polarity (WLP), warning lamp output switched either level open drain, when Warning lamp request (that Table page column WLN) occurs corresponding command transmitted. behavior output refer Table 7-4. driver short-circuit proof will switch after debounce time. activation warning lamp Warning lamp request suppressed after wake-up avoid flickering warning lamp during start-up phase (exception: lower thermal threshold level reached). driver also current sensor voltage monitoring which sets flags corresponding thresholds reached. Warnlamp open drain during suppression time after wake-up. oscillator does work after start internal oscillator watchdog timeout reached warning lamp switched
Table 7-4.
Warnlamp Request
Warning Lamp Status Table
Overcurrent Occurred Thermal Threshold Reached Suppression Time After Wake-up/VI Reset
TWLN (SPI) High High High High
4.8V 4.8V 4.8V 4.8V 4.8V 4.8V 4.8V 4.8V 4.8V 4.8V 4.8V 4.8V 4.8V 4.8V
High High High High High
Open drain Open drain Open drain Open drain Open drain Open drain Open drain Open drain Open drain Open drain
7.11
Reset
When V12, beyond their corresponding normal operating range temperature reached upper temperature level, reset indicated outputs RESN (640 tmos; tmos 1/fmos) RESAN. Additionally, RESAN activated command. input RSTN, Interface watchdog reset external signal (see Table page 25).
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7.12
Interface
ATA6842 supports 8-bit interface communicate with microprocessor. transmitted first. There status registers (address 0xxxxx01 0xxxxx10) control registers (address 1xxxxx01 1xxxxx10).
Table 7-5.
Status Register 0xxxxx01 Request Microprocessor
Name EK15S WLPS Meaning Comparator output EK15 status Warnlamp polarity status Function comparator below threshold comparator above threshold EK15 below threshold EK15 above threshold high normal operation overtemperature present overtemperature detection switched watchdog watchdog failure Status watchdog counter
Overtemperature status
WDOK WDC(2:0)
Watchdog status Watchdog counter
Table 7-6.
Status Register 0xxxxx10 Request Microprocessor
Name WLNOC ONOC OPOC WLNCS ONCS OPCS WLNVS ONVS Meaning Warnlamp overcurrent OUTN overcurrent OUTP overcurrent Warnlamp current status OUTN current status OUTP current status Warnlamp voltage status OUTN voltage status Function overcurrent overcurrent overcurrent overcurrent overcurrent overcurrent current below threshold current above threshold current below threshold current above threshold current below threshold current above threshold voltage below threshold voltage above threshold voltage below threshold voltage above threshold
ATA6842
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ATA6842
Table 7-7.
Control Register 1xxxxx01 Sent Microprocessor
Name TWLN Meaning Trigger warning lamp Trigger OUTN Trigger OUTP Trigger enable (keep alive) Trigger switch Trigger undervoltage reference Function OUTN OUTN OUTP OUTP keep alive keep alive V12S V12S high function high overtemperature high, else Comment Table page Table page Table 7-10 Table 7-11 page Table 7-10 Table 7-11 page Table page Used Testmode Table page
TOUTN TOUTP TV12S
Note:
TUVR OTDE
Overtemperature temperature detection detection enable temperature detection
Bold: default state after reset RSTN
Table 7-8.
Note:
Control Register 1xxxxx10 Sent Microprocessor
Name Meaning Trigger test current Trigger RESAN Trigger relay driver Trigger relay driver Trigger relay driver Trigger relay driver Function TCFET TCFET default RESAN reset (low) function Table page Table page Table page function Comment Table page
TTCFET TRESAN TRD4 TRD3 TRD2 TRD1
Bold: default state after reset RSTN
operation communication following timing diagrams (see Figure Figure page 24). With signal CSN, ATA6842 will selected communication microprocessor. With clock pulses CLK, address data transfer will synchronized. input address data from microprocessor ATA6842. data must valid falling edge pin. transfers data from ATA6842 microprocessor.
4964B-AUTO-07/07
request command structure read status register ATA6842) consists two-byte transmission. control command structure write control register ATA6842) consists three-byte transmission with eight clock pulses each low/high transition CSN. first byte identification. request command bytes shall have their most significant bit. address transmitted last bits. second byte (which dummy byte (0x00) next command), status register corresponding address first byte will sent start-up, returned value when first command sent will zero 'last command' available). Figure 7-2.
ADR1 ADR0
Request Command Structure (Read Register)
ADR1 ADR0
DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0
control command bytes shall have their most significant bit. address transmitted last bits. second byte data byte which contains control data send command. With second high transition data stored ATA6842. logic monitors faulty communication. check which data received ATA6842 second third clock cycle, address data sent back microprocessor tested verify that transmission correct. first data byte response byte last command while third byte address next data. there next command, address 0x00. Figure 7-3.
ADR1 ADR0 DATA7 DATA6 DATA5 DATA4 DATA3 DATA2 DATA1 DATA0 ADR7 DATA7 ADR1 ADR0
Control Command Structure (Write Register)
ADR7 ADR6 ADR5 ADR4 ADR3 ADR2 ADR1 ADR0
DATA1 DATA0
pulses must received when triggered, otherwise address and/or data will ignored zeros will returned minimum time receiving during otherwise, timeout expires receiving stopped. received data ignored. Therefore, minimum clock frequency transmission.
ATA6842
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ATA6842
7.13 External Voltage Regulator
ATA6842 control external voltage regulator with enable input. output provides same logic regulator (see Table 7-9). voltage monitoring, external generated voltage must connected Table 7-9.
Event Standby undervoltage undervoltage overvoltage Oscillator/bias failure overvoltage Reset RSTN range range Short circuit (overcurrent) Short circuit OUTx (overcurrent) Watchdog error
Logic Table
Info
On/Off On/Off
RESN Reset Reset Reset Reset Reset Reset reset Reset reset reset reset reset
RESAN reset Reset reset reset Reset Reset Reset reset reset Reset reset reset reset
V12S
OUTx On/Off On/Off(1) Temp
TCFET On/Off On/Off Perm
Upper thermal threshold
Off(1)
On/Off On/Off On/Off Temp(2)
mode Perm(3) Note: Corresponding driver switched thermal threshold number reached
Temp temporary state, recovery when event condition removed, except over-/undervoltage, thermal threshold number reached reset RSTN Perm permanent state, recovery when event condition removed, must re-engaged command overcurrent testable
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7.14
Low-/High-side Driver
ATA6842 features multipurpose outputs, low-side driver OUTN high-side driver OUTP. Both drivers controlled short-circuit proof (they will switch after debounce time short circuit detected). During short-circuit condition corresponding flag set. drivers disabled watchdog error during reset phase. Both drivers also have current sensor OUTN voltage monitor which sets flags corresponding thresholds reached. Table 7-10. Logic Table Low-side Driver
Overcurrent Thermal Threshold Number Reached
TOUTN (SPI) High
Watchdog Error
OUTN Open drain Open drain Open drain
Table 7-11.
Logic Table High-side Driver
Overcurrent Thermal Threshold Number Reached
TOUTP (SPI) High
Watchdog Error
OUTP High Open drain Open drain Open drain
7.15
Oscillators
watchdog oscillator provides internal frequency ±10% given external components. watchdog. failsafe reasons, clock frequency internally monitored oscillator with RREF running fOSC ±20%. This oscillator determines other time constants. watchdog oscillator frequency adjusted factor five with components according formula: 1/tWD where
0.632 0.684
first term describes charging external second term describes discharging. With period RCOS will result typically tosc 0.012) half frequency measured externally RCOS pin. oscillator failure generated oscillator watchdog occurs period RCOS smaller than tOSC greater than tOSC, fOSC 1/tOSC. oscillator failure, Table page
ATA6842
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ATA6842
7.16 Switch
command, voltage switched V12S (see Table page 25). switch current limitation.
7.17
Comparator
ATA6842 comparators. They compare inputs reference bandgap voltage. There internal pull-ups pull-downs. output V5-based push-pull stage. hysteresis implemented external resistors. Additionally, output comparator number read SPI.
7.18
TCFET Driver
ATA6842 features circuit drive external N-channel FET. control voltage generated charge pump with bootstrap circuit faster power-up behavior. Activation done command (see Table page 25).
7.19
Voltage Monitoring
undervoltage warning indicated output falls below UVR. This referencevoltage level adjusted external resistor divider. undervoltage warning tested with command.
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Ordering Information
Extended Type Number ATA6842-PLSW ATA6842-PLQW Package QFN48 QFN48 Remarks Tube, lead-free Taped reeled, lead-free
Package Information
Package: Exposed (acc. JEDEC OUTLINE MO-220) Dimensions indicated tolerances 0.05 max.
0.05-0.05
technical drawings according specifications
0.23
0.4±0.1 nom.
Drawing-No.: 6.543-5089.01-4 Issue: 24.01.03
ATA6842
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4964B-AUTO-07/07

Four DMOS Low-side Relay Drivers with Current Limitation Gate Driver E

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