DESCRIPTIO Complete Ambient Temperature Sensor Onboard System Pow
|
|
|
Top Searches for this datasheet
LTC1392 Micropower Temperature, Power Supply Differential Voltage Monitor
DESCRIPTIO
Complete Ambient Temperature Sensor Onboard System Power Supply Monitor 10-Bit Resolution Rail-to-Rail Common-Mode Differential Voltage Input Available 8-Pin PDIP 0.2µA Supply Current When Idle 700µA Supply Current When Sampling Maximum Rate Single Supply Voltage: 4.5V 3-Wire Half-Duplex Serial Communicates with Most Serial Ports Parallel Ports
LTC1392 micropower data acquisition system designed measure temperature, on-chip supply voltage differential voltage. differential inputs feature rail-to-rail common mode input voltage range. LTC1392 contains temperature sensor, 10-bit converter with sample-and-hold, high accuracy bandgap reference 3-wire half-duplex serial interface. LTC1392 programmed measure ambient temperature, power supply voltage external voltage differential input pins, that also used current measurement using external sense resistor. When measuring temperature, output code converter linearly proportional temperature Production trimming achieves ±2°C initial accuracy room temperature ±4°C over full 40°C 85°C temperature range. on-chip serial port allows efficient data transfer wide range MPUs over three four wires. This, coupled with power consumption, makes remote location sensing possible facilitates transmitting data through isolation barriers.
APPLICATI
Temperature Measurement Power Supply Measurement Current Measurement Remote Data Acquisition Environment Monitoring
registered trademarks Linear Technology Corporation.
TYPICAL APPLICATI
Complete Temperature, Supply Voltage Supply Current Monitor
TEMPERATURE ERROR (°C)
Output Temperature Error
LTC1392C GUARANTEED LIMIT LTC1392I GUARANTEED LIMIT TYPICAL
LTC1392 P1.4 (e.g., 68HC11) P1.3 P1.2 DOUT -VIN +VIN
TEMPERATURE (°C)
RSENSE ILOAD
LTC1392 TA01
LTC1392 TA02
LTC1392 ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
VIEW DOUT PACKAGE 8-LEAD PDIP -VIN +VIN
Supply Voltage (VCC) Input Voltage 0.3V 0.3V Output Voltage 0.3V 0.3V Operating Temperature Range LTC1392C. 70°C LTC1392I. 40°C 85°C Junction Temperature. 125°C Storage Temperature Range 65°C 150°C Lead Temperature (Soldering, sec). 300°C
ORDER PART NUMBER LTC1392CN8 LTC1392CS8 LTC1392IN8 LTC1392IS8 PART MARKING 1392 1392I
PACKAGE 8-LEAD PLASTIC
TJMAX 125°C, 100°C/ (N8) TJMAX 125°C, 130°C/ (S8)
Consult factory Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply Digital Conversion Resolution Total Absolute Error Differential Voltage Digital Conversion (Full-Scale Input Resolution Integral Linearity Error (Note Differential Linearity Error Offset Error Full-Scale Error Differential Voltage Digital Conversion (Full-Scale Input 0.5V) Resolution Integral Linearity Error (Note Differential Linearity Error Offset Error Full-Scale Error Temperature Digital Conversion Accuracy Nonlinearity CONDITIONS
(Note
UNITS
4.5V 4.5V
±0.5 ±0.5
±0.5 ±0.5
25°C (Note TMAX TMIN (Note TMIN TMAX (Note
LTC1392
ELECTRICAL CHARACTERISTICS
SYMBOL LEAKAGE IOFF LEAKAGE ISOURCE ISINK tSMPL tCONV tdDO tdis thDO PARAMETER On-Channel Leakage Current (Note Off-Channel Leakage Current (Note High Level Input Voltage Level Input Voltage High Level Input Current Level Input Current High Level Output Voltage Level Output Voltage Hi-Z Output Current Output Source Current Output Sink Current Supply Current Analog Input Sample Time Conversion Time Delay Time, DOUT Data Valid Delay Time, DOUT Data Enabled Delay Time, DOUT Hi-Z Time Output Data Remains Valid After DOUT Fall Time DOUT Rise Time Input Capacitance
(Note
CONDITIONS
UNITS
5.25V 4.75V 4.75V, IOUT 10µA 4.75V, IOUT 360µA 4.75V, IOUT 1.6mA High VOUT VOUT High Low, Figure Figure CLOAD 100pF CLOAD 100pF CLOAD 100pF CLOAD 100pF CLOAD 100pF Analog Input On-Channel Analog Input Off-Channel Digital Input
4.74 4.72
Cycles Cycles
RECOM ENDED OPERATING CONDITIONS
SYMBOL fCLK tCYC thDI tsuCS tWAKEUP tsuDI tWHCLK tWLCLK tWHCS tWLCS PARAMETER Supply Voltage Clock Frequency Total Cycle Time Hold Time, After Setup Time Before First (See Figure Wakeup Time Before Start (See Figure Setup Time, Stable Before Clock High Time Clock Time High Time Between Data Transfer Cycles Time During Data Transfer fCLK 250kHz Temperature Conversion Only Temperature Conversion Only fCLK 250kHz fCLK 250kHz Temperature Conversion Only CONDITIONS UNITS
LTC1392
RECOM ENDED OPERATING CONDITIONS
denotes specifications which apply over operating temperature range (0°C 70°C commercial grade 40°C 85°C industrial grade). Note Absolute maximum ratings those values beyond which life device impaired. Note voltage values with respect GND. Note Testing done 250kHz 25°C unless otherwise specified. Note Temperature integral nonlinearity defined deviation code versus temperature curve from best-fit straight line over device's rated temperature range. Note Voltage integral nonlinearity defined deviation code from straight line passing through actual points transfer curve. Note Channel leakage current measured after channel selection. Note guaranteed temperature limit curves temperature range first page this data sheet.
TYPICAL PERFORMANCE CHARACTERISTICS
Differential Nonlinearity Power Supply Voltage Mode
DIFFERENTIAL NONLINEARITY ERROR (LSB)
Integral Nonlinearity Power Supply Voltage Mode
INTEGRAL NONLINEARITY ERROR (LSB)
fCLK 250kHz 25°C
DIFFERENTIAL NONLINEARITY ERROR (LSB)
fCLK 250kHz 25°C
-0.5
-0.5
-1.0 CODE
1392
-1.0 CODE
1392
Integral Nonlinearity
DIFFERENTIAL NONLINEARITY ERROR (LSB)
INTEGRAL NONLINEARITY ERROR (LSB)
Differential Nonlinearity
INTEGRAL NONLINEARITY ERROR (LSB)
Full Scale fCLK 250kHz 25°C
Full Scale 0.5V fCLK 250kHz 25°C
-0.5
-0.5
-1.0 1024 CODE
1392
-1.0 1024 CODE
1392
Differential Nonlinearity
Full Scale fCLK 250kHz 25°C
-0.5
-1.0 1024 CODE
1392
Integral Nonlinearity
Full Scale 0.5V fCLK 250kHz 25°C
-0.5
-1.0 1024 CODE
1392
LTC1392 TYPICAL PERFORMANCE CHARACTERISTICS
Thermal Response Stirred Bath
TEMPERATURE (°C)
TEMPERATURE (°C)
TIME (SEC)
1392
TIME (SEC)
SUPPLY CURRENT (µA)
FUNCTIONS
(Pin Digital Input. configuration word shifted into this input. DOUT (Pin Digital Output. result shifted this output. (Pin Shift Clock. This clock synchronizes serial data. (Pin Chip Select Input. logic this input enables LTC1392. (Pin Ground Pin. should tied directly analog ground plane. +VIN (Pin Positive Analog Differential Input. used single-ended input grounding VIN. (Pin Negative Analog Differential Input. input must free from noise. (Pin8): Positive Supply. This supply must kept free from noise ripple bypassing directly ground plane.
BLOCK DIAGRAM
TEMPERATURE SENSOR
+VIN
VREF
-VIN
Thermal Response Still
1000
Supply Current Sample Rate
BETWEEN SAMPLES HIGH BETWEEN SAMPLES
fCLK 250kHz 25°C SAMPLE FREQUENCY (Hz) 100k
1392
1392
VREF 2.42V INPUT SHIFT REGISTER BANDGAP VREF VREF 0.5V 10-BIT CAPACITIVE SERIAL PORT BITS 10-BIT
DOUT
ANALOG INPUT CSAMPLE
COMP
CONTROL TIMING
LTC1392
LTC1392
TEST CIRCUITS
Load Circuit tdDO,
1.4V
tdDO
Voltage Waveforms DOUT Delay Time, tdDO
DOUT 100pF
LTC1392 TC02
TEST POINT
DOUT
LTC1392 TC03
Voltage Waveforms DOUT Rise Fall Times,
DOUT
2.0V
Voltage Waveforms tdis
1392 TC04
Load Circuit tdis
TEST POINT
DOUT WAVEFORM (SEE NOTE tdis DOUT WAVEFORM (SEE NOTE
NOTE WAVEFORM OUTPUT WITH INTERNAL CONDITIONS SUCH THAT OUTPUT HIGH UNTIL DISABLED OUTPUT CONTROL. NOTE WAVEFORM OUTPUT WITH INTERNAL CONDITIONS SUCH THAT OUTPUT UNTIL DISABLED OUTPUT CONTROL.
LTC1392 TC06
DOUT 100pF
tdis WAVEFORM tdis WAVEFORM
LTC1392 TC05
APPLICATIONS INFORMATION
LTC1392 micropower data acquisition system designed measure temperature, on-chip power supply voltage differential input voltage. LTC1392 contains following functional blocks: On-chip temperature sensor 10-bit successive approximation capacitive Bandgap reference Analog multiplexer (MUX) Sample-and-hold (S/H) Synchronous, half-duplex serial interface Control timing logic DIGITAL CONSIDERATIONS Serial Interface LTC1392 communicates with microprocessors other external circuitry synchronous, half-duplex, 3-wire serial interface (see Figure clock (CLK) synchronizes data transfer with each being transmitted falling edge captured rising edge both transmitting receiving systems. input data first received then conversion result transmitted (half-duplex). Half-duplex operation allows DOUT tied together allowing transmission over three wires: DATA (DIN/DOUT). Data transfer initiated falling chip select (CS) signal. After falling recognized, 80µs delay needed
LTC1392
APPLICATIONS INFORMATION
MSB-First Data (MSBF
tCYC tsuCS tWAKEUP SEL1 SEL0 START DOUT Hi-Z tSMPL tCONV MSBF Hi-Z FILLED WITH ZEROS
tsuCS tWAKEUP SEL1 SEL0 START DOUT Hi-Z MSBF Hi-Z FILLED WITH ZEROS
tSMPL
tCONV
LTC1392
temperature measurement 10µs delay other measurements, followed 4-bit input word which configures LTC1392 current conversion. This data word shifted into input. then disabled from shifting data DOUT configured from three-state output pin. null result current conversion serially transmitted falling edge onto DOUT line. format result either MSB-first sequence MSB-first sequence followed LSB-first sequence. This provides easy interface MSB- LSB-first serial ports. Bringing high resets LTC1392 next data exchange. INPUT DATA WORD Data transfer initiated falling chip select (CS) signal. After falls, LTC1392 looks start bit. Once start received, next three bits shifted into
tCYC
Figure
input which configures LTC1392 starts conversion. Further inputs input then ignored until next cycle. four bits input word defined follows:
Start Select Select MSBF
Start first "logic one" clocked into input after goes Start Bit. Start initiates data transfer leading zeros which precede this logical will ignored. After Start received remaining bits input word will clocked Further input then ignored until next cycle.
LTC1392
APPLICATIONS INFORMATION
Measurement Mode Selections bits input word following Start assign measurement mode requested conversion. Table shows mode selections. Whenever there mode change from another mode temperature measurement, temperature mode initializing cycle needed. first temperature data measurement after mode change should ignored.
Table Measurement Mode Selections
SELECT SELECT MEASUREMENT MODE Temperature Power Supply Voltage Differential Input, Full Scale Differential Input, 0.5V Full Scale
MSB-First/LSB-First (MSBF) output data LTC1392 programmed MSB-first LSB-first sequence using MSBF bit. When MSBF logical one, data will appear DOUT line MSB-first format. Logical zeros will filled indefinitely following last data accommodate longer word lengths required some microprocessors. When MSBF logical zero, LSB-first data will follow normal MSB-first data DOUT line. CONVERSIONS Temperature Conversion LTC1392 measures temperature through on-chip, proprietary temperature measurement technique. temperature reading provided 10-bit, unipolar format. Table describes exact relationship output data measured temperature equation used calculate temperature. Temperature (°C) Output Code/4
Note that LTC1392C only specified operation over 70°C temperature range LTC1392I over 40°C 85°C range. Performance tempera-
tures outside these specified temperature ranges guaranteed errors greater than those shown Electrical Characteristics table.
Table Codes Temperature Conversion
OUTPUT CODE 1111111111 1111111110 1001101101 1001101100 1001101011 0000000001 0000000000 TEMPERATURE (°C) 125.75 125.50 25.25 25.00 24.75 129.75 130.00
Voltage Supply (VCC) Monitor LTC1392 measures supply voltage through onchip supply line. reading provided 10-bit, unipolar format. Table describes exact relationship output data measured equation used calculate measured VCC. Measured [(Output Code) 4.84/1024] 2.42
guaranteed supply voltage monitor range from 4.5V Typical parts able maintain measurement accuracy with 3.25V. typical error plots shown page measured with from 3.63V 6.353V.
Table Codes Voltage Supply Conversion
OUTPUT CODE 1011110110 1011110101 1000100010 0110111001 0110111000 Supply Voltage (VCC) 6.003V 5.998V 5.001V 4.504V 4.500V
LTC1392
APPLICATIONS INFORMATION
Differential Voltage Conversion LTC1392 measures differential input voltage through pins VIN. Input ranges 0.5V full scale available differential voltage measurement with resolutions bits. Tables describe exact relationship output data measured differential input voltage 0.5V input range. Equations used calculate differential voltage 0.5V input voltage range respectively. output code unipolar format. Differential Voltage (10-bit code)/1024 Differential Voltage 0.5V (10-bit code)/1024
Table Codes Differential Voltage Range
OUTPUT CODE 1111111111 1111111110 0000000001 0000000000 INPUT VOLTAGE 1LSB 2LSB 1LSB 0LSB INPUT RANGE 999.0mV 998.0mV 0.977mV 0.00mV 1LSB 1/1024 REMARKS
Table Codes 0.5V Differential Voltage Range
OUTPUT CODE 1111111111 1111111110 0000000001 0000000000 INPUT VOLTAGE 0.5V 1LSB 0.5V 2LSB 1LSB 0LSB INPUT RANGE 0.5V 499.5mV 499.0mV 0.488mV 0.00mV 1LSB 0.5/1024 REMARKS
Thermal Coupling/Airflow supply current LTC1392 700µA typically when running maximum conversion rate. equivalent power dissipation 3.5mW causes temperature rise 0.455°C 0.35°C PDIP packages self-heating effects. sampling rates less than samples second, less than 20µA current drawn from supply (see Typical Performance Characteristics) self-heating effect negligible. This LTC1392 attached surface (such microprocessor chip heat sink) precision temperature monitoring. package leads principal path carry heat into device; thus wiring leaving device should held same temperature surface. easiest this cover wires with bead epoxy which will ensure that leads wires same temperature surface. thermal time constant LTC1392 still about seconds (see graph Typical Performance Charateristics section). Attaching LTC1392 small metal (which also provides small thermal mass) will help reduce thermal time constant, speed response give steadiest reading slow moving air.
LTC1392
TYPICAL APPLICATIONS
System Monitor Supply Voltages Ambient Temperature
1N4148 10µF 0.1µF 0.1µF LTC1430 COMP SHDN 220pF 7.5k 4700pF 100pF TRIMMED VOUT 3.3V MOTOROLA MTD20N03HL SHDN PVCC +VIN
System Monitor Relative Humidity, Supply Voltage Ambient Temperature
0.01µF
LTC1043 TRIM LT1004-1.2 SENSOR 100pF 0.1µF
220µF 2.5µH 330µF 6.3V VOUT 3.3V
10µF 0.1µF 100k
LTC1392 -VIN +VIN DOUT P1.4 (e.g., 8051) P1.3 P1.2
LTC1392 TA03
0.1µF
LTC1043 0.1µF 0.1µF 0.1µF OUTPUT 0.1µF 100% 100pF LTC1392 -VIN +VIN DOUT P1.4 (e.g., 8051) P1.3 P1.2
®1056 0.1µF
LM301A
TRIM
0.1µF
SENSOR: PANAMETRICS #RHS 500pF 1.7pF/%RH FILM RESISTOR
1392 TA04
LTC1392
PACKAGE DESCRIPTION
0.300 0.325 (7.620 8.255)
0.009 0.015 (0.229 0.381)
+0.025 0.325 -0.015 +0.635 8.255 -0.381
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.010 INCH (0.254mm)
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.016 0.050 0.406 1.270 *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
Dimemsions inches (millimeters) unless otherwise noted. Package 8-Lead PDIP (Narrow 0.300)
(LTC 05-08-1510)
0.400* (10.160)
0.255 0.015* (6.477 0.381)
0.130 0.005 (3.302 0.127)
0.045 0.065 (1.143 1.651)
0.065 (1.651) 0.005 (0.127) 0.100 0.010 (2.540 0.254) 0.125 (3.175) 0.018 0.003 (0.457 0.076) 0.015 (0.380)
0695
Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC 05-08-1610)
0.189 0.197* (4.801 5.004)
0.228 0.244 (5.791 6.197)
0.150 0.157** (3.810 3.988)
0.053 0.069 (1.346 1.752)
0.004 0.010 (0.101 0.254)
0.014 0.019 (0.355 0.483)
0.050 (1.270)
0695
LTC1392
TYPICAL APPLICATI
Measuring Secondary Temperature with External Thermistor
ERT-D2FHL103S DIVIDER OUTPUT VOLTAGE TEMPERATURE 6.8k
DIVIDER OUTPUT VOLTAGE
LT1004-1.2
RELATED PARTS
PART NUMBER LT1025 DESCRIPTION Micropower Thermocouple Cold Junction Compensator COMMENT Compatible with Standard Thermocouples Differential 2-Channel Multiplexed, Single Supply Differential 2-Channel Multiplexed, Single Supply SPI, QSPI Compatible, Single RON, Charge Injection Pins, Current LTC1285/LTC1288 Micropower 12-Bit ADCs with Auto Shutdown LTC1286/LTC1298 Micropower 12-Bit ADCs with Auto Shutdown LTC1391 LM334 Power, Precision 8-to-1 Analog Multiplexer Constant Current Source Temperature Sensor
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417q (408)432-1900 FAX: (408) 434-0507q TELEX: 499-3977 www.linear-tech.com
IDEAL OUTPUT -11.15mV/°C TEMPERATURE 1.371 ACTUAL DIVIDER OUTPUT TEMPERATURE (°C) 1.8k IDEAL OUTPUT -11.15mV/°C TEMPERATURE 1.371 TEMPERATURE RANGE: 38°C 80°C ±4°C D2FHL103S ASSUMING TOLERANCES LTC1392 -VIN +VIN DOUT P1.4 (e.g., 8051) P1.3 P1.2 FILM RESISTOR
1392 TA05
1392f LT/TP 0497 PRINTED
LINEAR TECHNOLOGY CORPORATION 1995
Other recent searches
WE05D9LC - WE05D9LC WE05D9LC Datasheet
ICL7109 - ICL7109 ICL7109 Datasheet
HDSP-450x - HDSP-450x HDSP-450x Datasheet
HDSP-510x - HDSP-510x HDSP-510x Datasheet
HDSP-M10x - HDSP-M10x HDSP-M10x Datasheet
DS2784 - DS2784 DS2784 Datasheet
CXA3250AN - CXA3250AN CXA3250AN Datasheet
CAV414 - CAV414 CAV414 Datasheet
60P42013 - 60P42013 60P42013 Datasheet
1N4448 - 1N4448 1N4448 Datasheet
Privacy Policy | Disclaimer
© 2012 Datasheet Archive
