16-Bit Resolution Eight Conversions Second, Adjustable Down 10-Bit Res
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TC3402 +1.8V, Low-Power, Quad-Input, 16-Bit Sigma-Delta Converter
16-Bit Resolution Eight Conversions Second, Adjustable Down 10-Bit Resolution Conversions Second 1.8V 5.5V Operation, Power Operating 250µA Sleep: 0.75µA Four True Differential Inputs with Built-In Multiplexer MicroPortSerial Requires Only Interface Lines Uses Internal External Reference Automatically Enters Sleep Mode When 16-Pin QSOP PDIP Packages
TC3402 cost, power analog-to-digital converter based Microchip's Sigma-Delta technology. will perform 16-bit conversions (15-bit plus sign) eight second. TC3402 optimized microcontroller peripheral cost, battery operated systems. voltage reference included, external reference used. TC3402's 2-wire MicroPortTMdigital interface used starting conversions reading data. Driving SCLK line starts conversion. After conversion starts, each additional falling edge six) detected SCLK seconds reduces resolution cuts conversion time half. After conversion completed, clocking SCLK line puts through resulting data word onto SDAT line, much like shift register. part automatically sleeps when performing data conversion. TC3402 available 16-Pin PDIP 16-Pin QSOP packages.
TYPICAL APPLICATIONS
Consumer Electronics, Thermostats, Monitors, Humidity Meters, Security Sensors Embedded Systems, Data Loggers, Portable Equipment Medical Instruments
TYPICAL APPLICATION
ORDERING INFORMATION
Part
VBATT
Package
16-Pin PDIP (Narrow) 16-Pin QSOP (Narrow)
Temp. Range
+85°C +85°C
TC3402VPE TC3402VQR
IN1+ IN1- IN2+ IN2- IN3+ IN3- IN4+ IN4-
SDAT SCLK ADDR ADDR I/01 I/02 I/03 I/04
CONFIGURATIONS
TC3402
Controller
IN1+ IN1- IN2+
16-Pin PDIP/QSOP
SCLK IN4+ IN4- SDAT REFOUT
REFIN REFOUT
IN2- IN3+ IN3- REFIN
TC3402
2001 Microchip Technology Inc.
DS21411A
TC3402-1
6/29/00
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage .6.0V Input Voltage (GND 0.3V) (VDD 0.3V) Operating Temperature 85°C Maximum Chip Temperature +150°C Storage Temperature Range 65°C +150°C Lead Temperature (Soldering, sec) +300°C
*Static-sensitive device. Unused devices must stored conductive material. Protect devices from static discharge static fields. Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. These stress ratings only functional operation device these other conditions above those indicated operational sections specifications implied. Exposure Absolute Maximum Rating Conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS: 25°C 2.7V, unless otherwise specified. Specifications Bold type apply over temperature range 85°C. VREF 1.25V, Internal Clock Freq 520kHz
Symbol
IDD(SLEEP) IDD(SLEEP) VNOISE PSRR
Parameter
Test Conditions
0.75 .0038 0.4% 1.193
Unit
Bits %FSR %FSR µVrms
POWER SUPPLY
Supply Voltage Supply Current, During Data Conversion Supply Current, Sleep Mode +25°C
ACCURACY (Differential Inputs)
Resolution Integral Non-Linearity Offset Error Refered input Common Mode Rejection Full Scale Error Power Supply Rejection Ratio Differential Input Voltage Absolute Voltage Range INn+, INn-, Input Bias Current Input Sampling Capacitance Differential Input Resistance REFIN Voltage Range REFIN Input Current REFOUT Voltage REFOUT Current Sink Capability REFOUT Current Source Capability Input Voltage Input High Voltage Leakage Current
Differential input voltage defined (VIN+ VIN-) Resistance from INn+ INn- GND.
2.7V 2.5V 3.5V (Note
±1.0
1.25
INn+,
VIN±
(Note
REFIN, REFOUT
VREF IREF VREFOUT REFSINK REFSRC
SCLK, ADDR
ILEAK
Notes:
TC3402-1 6/29/00
2001 Microchip Technology Inc.
DS21411A
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
ELECTRICAL CHARACTERISTICS (CONT.): 25°C 2.7V, unless otherwise specified. Specifications Bold type apply over temperature range 85°C.
Symbol SDAT
Output Voltage Output High Voltage (SDAT) 1.5mA ISOURCE 400µa (Note
Parameter
Test Conditions
Unit
ELECTRICAL CHARACTERISTICS:TA 25°C 2.7V, unless otherwise specified. Specifications Bold type apply over temperature range 85°C. VREF 1.25V, Internal Clock Freq 520kHz
Symbol Parameter Resolution Reduction Clock Width Conversion Time (15-Bit Plus Sign) Conversion Time (14-Bit Plus Sign) Conversion Time (13-Bit Plus Sign) Conversion Time (12-Bit Plus Sign) Conversion Time (11-Bit Plus Sign) Conversion Time (10-Bit Plus Sign) Conversion Time (9-Bit Plus Sign) Resolution Reduction Window SCLK Data Valid Address Setup Address Hold Acknowledge Delay Description Width SCLK (Negative) Width SCLK (Positive) 16-bit conversion, (Note 15-bit conversion 14-bit conversion 13-bit conversion 12-bit conversion 11-bit conversion 10-Bit conversion Width SCLK SCLK falling edge SDAT valid Address valid SCLK SCLK address valid hold SCLK SDAT delay 1000 1000 t3/2.0 t3/4.0 t3/7.8 t3/15.1 t3/28.6 t3/51.4 t3/85.7 1000 Unit µsec µsec msec msec msec msec msec msec msec msec nsec nsec nsec nsec
Notes: Nominal temperature drift -2830 ppm/°C temperature less than 25°C -1340 ppm/°C temperatures greater than 25°C. @VDD =1.8V, ISOURCE 200µa
2001 Microchip Technology Inc.
DS21411A
TC3402-1 6/29/00
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
DESCRIPTION
TC3402
1,3,5,12
Name
Description
Analog Input. This positive terminal true differential input consisting INn+ INn-. VIN(n) (INn+ INn-).(See Electrical Characteristics.) Analog Input. This negative terminal true differential input consisting INn+ INn- VIN(n) (INn+ INn-) INn- swing below, ground. (See Electrical Characteristics.) Analog Input. converter's reference voltage differential between this ground times two. connected REFOUT shown page scaled using resistor divider. user supplied reference voltage power supply rail used place REFOUT. Ground Terminal. Analog Output. internal reference connects this pin. scaled externally, desired, tied REFIN input provide converter's reference voltage. Care must taken connecting external circuitry this pin. (See Electrical Characteristics.) Digital Output (push-pull). This MicroPortserial data output. SDAT driven while TC3402 converting data, effectively providing "busy" signal. After conversion complete, every highto-low transition SCLK puts from resulting data word SDAT (from LSB). Digital Input. Controls analog multiplexer conjunction with select four Input channels. This address latched falling edge SCLK, which starts conversion. A1,A0 Input Input Input Input Digital Input. Controls analog multiplexer conjunction with select four Input channels. This address latched falling edge SCLK, which starts conversion. A1,A0 Input Input Input Input Digital Input. This MicroPortserial clock input. After conversion starts, each additional falling edge six) detected SCLK seconds reduces resolution bit. When conversion complete, data word shifted SDAT clocking SCLK pin. Power Supply Input. (See Electrical Characteristics.)
2,4,6,11
INn-
REFIN
REFOUT
SDAT
SCLK
TC3402-1 6/29/00
2001 Microchip Technology Inc.
DS21411A
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
GENERAL THEORY OPERATION
TC3402 16-bit sigma-delta converter. four differential inputs analog multiplexer. detailed description components TC3402 outlined below. (Also refer Operational Flowchart page Timing Diagrams Figures through Table Data Conversion Word Voltage Input (REFIN 1.193V) Data Word INn+ INn- (Volts)
0111 1111 1111 1111 0000 0000 0000 0001 0000 0000 0000 0000 1111 1111 1111 1111 1000 0000 0000 0001 1000 0000 0000 0000 2.38596 (Positive Full Scale) 72.8 -72.8 -2.38596 (Negative Full Scale) Reserved Code
Converter Operation
When TC3402 converting, sleep mode with both SCLK SDAT lines high. conversion initiated high transition SCLK line which time internal clock TC3402 started address value internally latched. address value steers analog multiplexer select input channel converted. Each additional high transition SCLK (following initial SCLK falling edge) during time interval will decrement conversion accuracy reduce conversion time half. time interval referred resolution reduction window. minimum conversion resolution bits more than SCLK transitions during will ignored. After each high transition SCLK, interval, SDAT output driven high TC3402 acknowledge that conversion been decremented. When SCLK returns high interval ends, SDAT line returns (see Figure When conversion complete SDAT driven high. 3402 enters sleep mode conversion value read serial data word SDAT line.
SCLK input filter which rejects positive negative pulse width less than 50nsec reduce noise. rejection width this pulse vary between 50nsec 750nsec depending processing parameters supply voltage. Figure shows truth table determining mode operation TC3402 part recording value SDAT SCLK high, then low, then high state. example, SCLK goes through 1-0-1 transition corresponding values SDAT 1-1-0, then SCLK falling edge started data conversion. 0-1-0 SDAT would have indicated resolution reduction occurred. This useful microcontroller watchdog reset otherwise loses track where TC3402 part conversion data readout sequence. microcontroller simply transition SCLK until "finds" Start Conversion condition.
Reading Data Word
After conversion complete SDAT goes high, conversion value clocked serially onto SDAT line high transitions SCLK. data word two's compliment format with sign clocked onto SDAT line first followed ending LSB. conversion data word would consist sign follwed magnitude bits, Table shows data word versus input voltage conversion. Note that full scale input voltage range REFIN 1LSB). When REFOUT back directly REFIN, 73µV convertion, REFOUT typically 1.193V. Figure shows typical SCLK SDAT waveforms conversions. Note that complete convert read cycle requires negative edge clock pulses. first convert command. Then, these occur resolution reduction window, decrement accuracy. remaining pulses clock conversion data word.
2001 Microchip Technology Inc. DS21411A
TC3402-1 6/29/00
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
FUNCTIONAL BLOCK DIAGRAM
1.193V
REFOUT REFIN
IN1+ IN1- IN2+ IN2- IN3+ IN3- IN4+ IN4-
AMux
DATA SHIFT Modulator
SDAT
CONV done
CONVCLK
Start Conv.
CLOCK GENERATOR CONTROL CIRCUITRY
CLKOUT
SCLK
TC3402-1 6/29/00
2001 Microchip Technology Inc.
DS21411A
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
TIMING DIAGRAMS
SCLK
(MSB) (LSB) Sleep Mode DN-2
SDAT
DN-1
Data Conversion Complete
ADDR, Start Conversion Resolution Control Timing Data Output Timing
Figure Conversion Data Output Timing
SCLK
Status
Start Conversion Resolution Reduction Data Transfer Data Transfer Busy* Data Transfer
SDAT
*Note: code dual meaning: Data Transfer Busy Converting.To avoid confusion, user should send only required number pulses desired resolution, then wait SDAT rise indicating conversion complete before clocking SCLK again read data bits.
Figure SCLK, SDAT Logic State Table
2001 Microchip Technology Inc.
DS21411A
TC3402-1 6/29/00
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
TIMING DIAGRAMS (CONT.)
16-Bit Data Conversion data word A5A5h
SCLK
SDAT
Data Conversion Complete
16-Bit Data Conversion,long start pulse, data word 5A5Ah
SCLK
SDAT
Data Conversion Complete
12-Bit Conversion data word AB3h
SCLK
SDAT
Data Conversion Complete
10-Bit Conversion with "extra" data reduction clocks, data word 3A4h
SCLK
SDAT
Data Conversion Complete
Figure Example Timing Diagrams
TC3402-1 6/29/00
2001 Microchip Technology Inc.
DS21411A
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
OPERATIONAL FLOWCHART
SDAT CONVCLK (Conversion Done?)
SLEEP (SDAT high)
SCLK high-to-low?
Power Down Analog, Conversion Complete, SDAT high;
Power Analog, Start CONVCLK (=0), Start Conversion, Resolution 16), latch input channel address applicable).
SCLK high-to-low?
SCLK low-to-high transition?
SDAT m=m-1
SDAT
CONVCLK
SDAT high Internal Reset
SCLK high-to-low? SLEEP
Resolution 210?
Reduce Resolution SDAT high
2001 Microchip Technology Inc.
DS21411A
TC3402-1 6/29/00
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
TAPING FORM
Component Taping Orientation 16-Pin QSOP (Narrow) Devices
User Direction Feed
User Direction Feed
Standard Reel Component Orientation Suffix Device
Reverse Reel Component Orientation Suffix Device
Carrier Tape, Reel Size, Number Components Reel Reel Size
Package Carrier Width Pitch Part Full Reel Reel Size
16-Pin QSOP
2500
TC3402-1 6/29/00
2001 Microchip Technology Inc.
DS21411A
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
PACKAGE DIMENSIONS
16-Pin PDIP (Narrow)
.270 (6.86) .240 (6.10)
.045 (1.14) .030 (0.76) .770 (19.56) .740 (18.80) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .310 (7.87) .290 (7.37)
.040 (1.02) .020 (0.51)
.014 (0.36) .008 (0.20) .400 (10.16) .310 (7.87)
MAX.
.110 (2.79) .090 (2.29)
.070 (1.78) .045 (1.14)
.022 (0.56) .015 (0.38)
16-Pin QSOP (Narrow)
.157 (3.99) .150 (3.81) .244 (6.20) .228 (5.80)
.196 (4.98) .189 (4.80)
.010 (0.25) .004 (0.10) .069 (1.75) .053 (1.35) MAX. .050 (1.27) .016 (0.41)
.010 (0.25) .007 (0.19)
.025 (0.635) TYP.
.012 (0.31) .008 (0.21)
DImensions: inches(mm)
2001 Microchip Technology Inc. DS21411A
TC3402-1 6/29/00
+1.8V, Low-Power, Quad-Input, 16-Bit, Sigma-Delta, Converter TC3402
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rights reserved. 2001 Microchip Technology Incorporated. Printed USA. 1/01
Information contained this publication regarding device applications like intended through suggestion only superseded updates. your responsibility ensure that your application meets with your specifications. representation warranty given liability assumed Microchip Technology Incorporated with respect accuracy such information, infringement patents other intellectual property rights arising from such otherwise. products critical components life support systems authorized except with express written approval Microchip. licenses conveyed, implicitly otherwise, except maybe explicitly expressed herein, under intellectual property rights. Microchip logo name registered trademarks Microchip Technology Inc. U.S.A. other countries. rights reserved. other trademarks mentioned herein property their respective companies.
TC3402-1 6/29/00
2001 Microchip Technology Inc.
DS21411A
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