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Part: DS1631A
Category:
Sensors
-> Temperature Sensors
Description: DS1631/DS1631A/DS1731 High-precision Digital Thermometer And Thermostat
Company: Maxim Integrated Products
Datasheet: Download DS1631A datasheet File size : 725 kB
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DS1631/DS1631A/DS1731
High-Precision Digital Thermometer and Thermostat
www.maxim-ic.com
FEATURES
§ § § § § § § § § § § § DS1631 and DS1631A Provide ±0.5°C Accuracy over a 0°C to +70°C Range DS1731 Provides ±1°C Accuracy over a -10°C to +85°C Range DS1631A Automatically Begins Taking Temperature Measurements at Power-Up Operating Temperature Range: -55°C to +125°C (-67°F to +257°F) Temperature Measurements Require No External Components Output Resolution is User-Selectable to 9, 10, 11, or 12 Bits Wide Power-Supply Range (+2.7V to +5.5V) Converts Temperature-to-Digital Word in 750ms (max) Multidrop Capability Simplifies Distributed Temperature-Sensing Applications Thermostatic Settings are User-Definable and Nonvolatile (NV) Data is Read/Written Through 2-Wire Serial Interface (SDA and SCL Pins) All Three Devices are Available in 8-Pin mSOP Packages and the DS1631 is Also Available in a 150mil SO package--see Table 1 for Ordering Information
PIN CONFIGURATIONS
SDA SCL TOUT GND
1 2 3 4 8 7 6 5
VDD A0 A1 A2
mSOP (DS1631U, DS1631AU, DS1731U)
SDA SCL TOUT GND
1 2 3 4 8 7 6 5
VDD A0 A1 A2
SO (150mil) (DS1631Z) See Table 2 for Pin Descriptions
APPLICATIONS
§ § § § Network Routers and Switches Cellular Base Stations Portable Products Any Space-Constrained Thermally Sensitive Product
DESCRIPTION
The DS1631, DS1631A, and DS1731 digital thermometers provide 9, 10, 11, or 12-bit temperature readings over a -55°C to +125°C range. The DS1631 and DS1631A thermometer accuracy is ±0.5°C from 0°C to +70°C with 3.0V £ VDD £ 5.5V, and the DS1731 accuracy is ±1°C from -10°C to +85°C with 3.0V £ VDD £ 5.5V. The thermostat on all three devices provides custom hysteresis with user-defined trip points (TH and TL). The TH and TL registers and thermometer configuration settings are stored in NV EEPROM so they can be programmed prior to installation. In addition, the DS1631A automatically begins taking temperature measurements at power-up, which allows it to function as a stand-alone thermostat. Communication with the DS1631/DS1631A/DS1731 is achieved through a 2-wire serial interface, and three address pins allow up to eight devices to be multidropped on the same 2-wire bus. Pin descriptions for the DS1631/DS1631A/DS1731 are provided in Table 2 and user-accessible registers are summarized in Table 3. A functional diagram is shown in Figure 1.
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DS1631/DS1631A/DS1731
Table 1. ORDERING INFORMATION
ORDERING NUMBER DS1631 U DS1631U/T&R DS1631Z DS1631Z/T&R DS1631AU DS1631AU/T&R DS1731 U DS1731U/T&R PACKAGE MARKING D1631 D1631 DS1631Z DS1631Z 1631A 1631A D1731 D1731 DESCRIPTION DS1631 in 8-Pin mSOP DS1631 in 8-Pin mSOP, 3000-Piece Tape-and-Reel DS1631 in 150mil 8-Pin SO DS1631 in 150mil 8-Pin SO, 2500-Piece Tape-and-Reel DS1631A in 8-Pin mSOP DS1631A in 8-Pin mSOP, 3000-Piece Tape-and-Reel DS1731 in 8-Pin mSOP DS1731 in 8-Pin mSOP, 3000-Piece Tape-and-Reel
Table 2. DETAILED PIN DESCRIPTION
PIN 1 2 3 4 5 6 7 8 SYMBOL SDA S CL TOUT GND A2 A1 A0 VDD DESCRIPTION Data Input/Output Pin for 2-Wire Serial Communication Port. Open-Drain. Clock Input Pin for 2-Wire Serial Communication Port. Thermostat Output Pin. Push-Pull. Ground Pin Address Input Pin Address Input Pin Address Input Pin Supply Voltage Pin. +2.7V to +5.5V Power-Supply Pin.
Figure 1. FUNCTIONAL DIAGRAM
VDD
CONFIGURATION REGISTER AND CONTROL LOGIC TEMPERATURE SENSOR and DS ADC ADDRESS AND I/O CONTROL
SCL SDA A0 A1 A2
TEMPERATURE REGISTER TH REGISTER DIGITAL COMPARATOR/LOGIC TL REGISTER TOUT
GND
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DS1631/DS1631A/DS1731
ABSOLUTE MAXIMUM RATINGS*
Voltage on any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Solder Dip Temperature (10s) Reflow Oven Temperature -0.5V to +6.0V -55°C to +125°C -55°C to +125°C See IPC/JEDEC J-STD-020A Specification +220°C
* These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
DC ELECTRICAL CHARACTERISTICS (VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETER Supply Voltage DS1631, DS1631A Thermometer Error SYMBOL VDD TERR CONDITION 0°C to +70°C, 3.0V £ VDD £ 5.5V 0°C to +70°C, 2.7V £ VDD < 3.0V -55°C to +125°C -10°C to +85°C, 3.0V £ VDD £ 5.5V -10°C to +85°C, 2.7V £ VDD < 3.0V -55°C to +125°C -0.5 0.7 x VDD 0 0 -10 MIN 2.7 MAX 5.5 ±0.5 ±1 ±2 ±1 ±1.5 ±2 0.3 x VDD VDD + 0.3 0.4 0.6 +10 1 mA 1.25 400 110 800 2.4 0.4 µA nA V V 4 1 1 3 V V V µA °C 2 °C 2 UNITS V NOTES 1
DS1731 Thermometer Error Low-Level Input Voltage High-Level Input Voltage SDA Low-Level Output Voltage Input Current Each I/O Pin
TERR
VIL VIH VOL1 VOL2 3mA sink current 6mA sink current 0.4 < VI/O < 0.9VDD Temperature conversion -55°C to +85°C Temperature conversion +85°C to +125°C E2 write Communication only 0°C to +70°C 1mA source current 4mA sink current
Active Supply Current
IDD
Standby Supply Current TOUT Output Logic Voltage
ISTBY VOH VOL
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DS1631/DS1631A/DS1731
AC ELECTRICAL CHARACTERISTICS (VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETER SYMBOL CONDITION 9-bit resolution 10-bit resolution 11-bit resolution 12-bit resolution MIN TYP MAX 93.75 187.5 375 750 0 1.3 0.6 1.3 0.6 0.6 0 100 20 + 0.1CB 20 + 0.1CB 0.6 400 10 5 0 50 1000 300 0.9 400 kHz µs µs µs µs µs µs ns ns ns µs pF pF pF ns 5 5, 6 5 5 5 5 5 5, 7 5, 7 5 ms UNITS NOTES
Temperature Conversion Time
tTC
SCL Frequency Bus Free Time Between a STOP and START Condition START and Repeated START Hold Time from Falling SCL Low Period of SCL High Period of SCL Repeated START Condition Setup Time to Rising SCL Data-Out Hold Time from Falling SCL Data-In Setup Time to Rising SCL Rise Time of SDA and SCL Fall Time of SDA and SCL STOP Setup Time to Rising SCL Capacitive Load for Each Bus Line I/O Capacitance Input Capacitance Spike Pulse Width that can be Suppressed by Input Filter
fSCL tBUF tHD:STA tLOW tHIGH tSU:STA tHD:DAT tSU:DAT tR tF tSU:STO CB CI/O CI tSP
NOTES:
All voltages are referenced to GND. See Figure 2 for Typical Operating Curves. Specified with TOUT pin open; A0, A1, A2 = 0V or VDD; and fSCL ³ 2Hz. Specified with temperature conversions stopped; TOUT pin open; SDA = VDD; SCL = VDD; and A0, A1, A2 = 0V or VDD. 5) See Timing Diagram in Figure 3. All timing is referenced to 0.9 x VDD and 0.1 x VDD. 6) After this period the first clock pulse is generated. 7) For example, if CB = 300pF, then tR[min] = tF[min] = 50ns.
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1) 2) 3) 4)
DS1631/DS1631A/DS1731
EEPROM AC ELECTRICAL CHARACTERISTICS (VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETER EEPROM Write Cycle Time EEPROM Writes EEPROM Data Retention SYMBOL twr NEEWR tEEDR CONDITION -55°C to +55°C -55°C to +55°C MIN 50k 10 TYP 4 MAX 10 UNITS ms Writes Years
Figure 2. TYPICAL OPERATING CURVES
DS1631/DS1631A
0.8 0.6 0.4 0.8 0.6 0.4
DS1731
ERROR (°C)
0.2 0 -0.2 -0.4 -0.6 -0.8 0 10
-3s
ERROR (°C)
+3s Mean
0.2 0 -0.2 -0.4 -0.6 -0.8
-3 s Mean
+3 s
20
30
40
50
60
70
-10
0
10
20
30
40
50
60
70
80
REFERENCE TEMPERATURE (°C)
REFERENCE TEMPERATURE (°C)
Figure 3. TIMING DIAGRAM
All timing is referenced to 0.9 x VDD and 0.1 x VDD.
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