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DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
General Description
The DS1631, DS1631A, and DS1731 digital thermome-
ters 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 ther-
mostat 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.
Pin descriptions for the DS1631/DS1631A/DS1731 are pro-
vided in Table 2 and user-accessible registers are summa-
rized in Table 3. A functional diagram is shown in Figure 1.
Applications
● Network Routers and Switches
● Cellular Base Stations
● Portable Products
● Any Space-Constrained Thermally Sensitive Product
Benefits and Features
● Maximize System Accuracy in Broad Range of
Thermal Management Applications
• Operating Temperature Range: -55°C to +125°C
(-67°F to +257°F)
• DS1631 and DS1631A: ±0.5°C Accuracy over 0°C
to +70°C Range
• DS1731: ±1°C Accuracy over a -10°C to +85°C Range
• User-Selectable Output Resolution from 9 Bits to
12 Bits
● Reduce Cost with No External Components
● Simplify Distributed Temperature-Sensing Applications
with Multidrop Capability
• Up to Eight Devices Can Operate on a 2-Wire Bus
● Flexible and Nonvolatile User-Defined Thermostatic
Modes with Custom Hysteresis
● Available in 8-Pin µSOP and SO (DS1631 and
DS1631A Only) and the 8-Pin DIP (DS1631 Only)
Packages
Pin Configurations
TOP VIEW
SDA 1
SCL 2
TOUT 3
GND 4
+
DS1631
8 VDD
7 A0
6 A1
5 A2
µSOP
(DS1631U+, DS1631AU+, DS1731U+)
SDA 1 +
8 VDD
SCL 2
DS1631
7 A0
TOUT 3
6 A1
GND 4
5 A2
SO (150mil and 208mil)
(DS1631Z+, DS1631S+)
Ordering Information appears at end of data sheet.
See Table 2 for Pin Descriptions.
19-7488; Rev 1; 1/15

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DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
Absolute Maximum Ratings
Voltage on any Pin Relative to Ground.................-0.5V to +6.0V
Operating Temperature Range.......................... -55°C to +125°C
Storage Temperature Range............................. -55°C to +125°C
Solder Dip Temperature (10s)........See IPC/JEDEC J-STD-020A
Specification
Reflow Oven Temperature................................................+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
SYMBOL
VDD
DS1631, DS1631A
Thermometer Error (Note 2)
TERR
DS1731 Thermometer Error
(Note 2)
Low-Level Input Voltage
High-Level Input Voltage
SDA Low-Level Output
Voltage
Input Current Each I/O Pin
TERR
VIL
VIH
VOL1
VOL2
Active Supply Current (Note 3)
IDD
Standby Supply Current
TOUT Output Logic Voltage
ISTBY
VOH
VOL
CONDITION
(Note 1)
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
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 (Note 4)
1mA source current (Note 1)
4mA sink current (Note 1)
MIN MAX
2.7 5.5
±0.5
±1
±2
±1
±1.5
-0.5
0.7 x VDD
0
0
-10
±2
0.3 x VDD
VDD + 0.3
0.4
0.6
+10
1
1.25
400
110
800
2.4
0.4
UNITS
V
°C
°C
V
V
V
µA
mA
µA
nA
V
V
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DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
AC Electrical Characteristics
(VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETER
Temperature Conversion Time
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
SYMBOL
tTC
fSCL
tBUF
tHD:STA
tLOW
tHIGH
tSU:STA
tHD:DAT
tSU:DAT
tR
tF
tSU:STO
CB
CI/O
CI
tSP
CONDITION
9-bit resolution
10-bit resolution
11-bit resolution
12-bit resolution
(Note 5)
(Note 5, 6)
(Note 5)
(Note 5)
(Note 5)
(Note 5)
(Note 5)
(Note 5, 7)
(Note 5, 7)
(Note 5)
MIN TYP MAX UNITS
93.75
187.5
375
ms
750
0 400 kHz
1.3 µs
0.6 µs
1.3 µs
0.6 µs
0.6 µs
0 0.9 µs
100
20 + 0.1CB
20 + 0.1CB
0.6
1000
300
ns
ns
ns
µs
400 pF
10 pF
5 pF
0 50 ns
Note 1: All voltages are referenced to GND.
Note 2: See Figure 2 for Typical Operating Curves.
Note 3: Specified with TOUT pin open; A0, A1, A2 = 0V or VDD; and fSCL ≥ 2Hz.
Note 4: Specified with temperature conversions stopped; TOUT pin open; SDA = VDD; SCL = VDD; and A0, A1, A2 = 0V or VDD.
Note 5: See Timing Diagram in Figure 3. All timing is referenced to 0.9 x VDD and 0.1 x VDD.
Note 6: After this period the first clock pulse is generated.
Note 7: For example, if CB = 300pF, then tR[min] = tF[min] = 50ns.
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 TYP MAX UNITS
4 10 ms
50k Writes
10 Years
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DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
Table 2. Detailed Pin Description
PIN SYMBOL
DESCRIPTION
1
SDA
Data Input/Output Pin for 2-Wire Serial Communication Port. Open-Drain.
2
SCL
Clock Input Pin for 2-Wire Serial Communication Port.
3
TOUT
Thermostat Output Pin. Push-Pull.
4
GND
Ground Pin
5 A2 Address Input Pin
6 A1 Address Input Pin
7 A0 Address Input Pin
8 VDD Supply Voltage Pin. +2.7V to +5.5V Power-Supply Pin.
VDD
SCL
SDA
ADDRESS
A0 AND
I/O CONTROL
A1
A2
GND
CONFIGURATION REGISTER
AND CONTROL LOGIC
TEMPERATURE SENSOR
AND ∆Σ ADC
TEMPERATURE REGISTER
TH REGISTER
TL REGISTER
DS1631
DIGITAL
COMPARATOR/LOGIC
TOUT
Figure 1. Functional Diagram
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
0
DS1631/DS1631A
+3σ
MEAN
-3σ
10 20 30 40 50 60
REFERENCE TEMPERATURE (°C)
Figure 2. Typical Operating Curves
DS1731
0.8
0.6
0.4
+3σ
0.2
0
MEAN
-0.2
-0.4
-3σ
-0.6
-0.8
70
-10 0
10 20 30 40 50 60 70 80
REFERENCE TEMPERATURE (°C)
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DS1631/DS1631A/
DS1731
High-Precision Digital
Thermometer and Thermostat
ALL TIMING IS REFERENCED TO 0.9 X VDD AND 0.1 x VDD.
SDA
tBUF
tLOW
tR
tF
tHD:STA
tSP
SCL
STOP START
tHD:STA
tHD:DAT
tHIGH
tSU:DAT
tSU:STA
REPEATED
START
tSU:STO
Figure 3. Timing Diagram
Table 3. Register Summary
REGISTER NAME
(USER ACCESS)
SIZE
(BYTES)
Temperature (Read Only)
2
TH (Read/Write)
TL (Read/Write)
2
2
Configuration (Various bits are Read/
Write and Read Only—See Table 5)
1
MEMORY
TYPE
SRAM
EEPROM
EEPROM
SRAM,
EEPROM
REGISTER CONTENTS
AND POWER-UP STATE
Measured temperature in two’s complement format.
Power-up state: -60ºC (1100 0100 0000 0000)
Upper alarm trip point in two’s complement format.
Factory state: 15ºC (0000 1111 0000 0000)
Lower alarm trip point in two’s complement format.
Factory state: 10ºC (0000 1010 0000 0000)
Configuration and status information. Unsigned data.
6 MSbs = SRAM
2 LSbs (POL and 1SHOT bits) = EEPROM
Power-up state: 100011XX (XX = user defined)
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