DS1631 Datasheet, PDF (1/15 Pages) National Semiconductor (TI) – CMOS Dual Peripheral Drivers

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FEATURES
ƒ DS1631 and DS1631A Provide ±0.5°C
Accuracy over a 0°C to +70°C Range
ƒ DS1731 Provides ±1°C Accuracy over a
-10°C to +85°C Range
ƒ DS1631A Automatically Begins Taking
Temperature Measurements at Power-Up
ƒ Operating Temperature Range: -55°C to
+125°C (-67°F to +257°F)
ƒ Temperature Measurements Require No
External Components
ƒ Output Resolution is User-Selectable to 9,
10, 11, or 12 Bits
ƒ Wide Power-Supply Range (+2.7V to +5.5V)
ƒ Converts Temperature-to-Digital Word in
750ms (max)
ƒ Multidrop Capability Simplifies Distributed
Temperature-Sensing Applications
ƒ Thermostatic Settings are User-Definable
and Nonvolatile (NV)
ƒ Data is Read/Written Through 2-Wire Serial
Interface (SDA and SCL Pins)
ƒ All Three Devices are Available in 8-Pin
μSOP Packages and the DS1631 is Also
Available in a 150mil SO package—see
Table 1 for Ordering Information
DS1631/DS1631A/DS1731
High-Precision Digital
Thermometer and Thermostat
PIN CONFIGURATIONS
SDA 1
8
V_DD
SCL 2
7
A₀
T_OUT
3
6
A₁
GND 4
5
A₂
μSOP
(DS1631U+, DS1631AU+,
DS1731U+)
SDA 1
8 V_DD
SCL 2
T_OUT
3
GND 4
7 A₀
6 A₁
5 A₂
SO (150mil and 208mil)
(DS1631Z+, DS1631S+)
See Table 2 for Pin Descriptions
APPLICATIONS
ƒ Network Routers and Switches
ƒ Cellular Base Stations
ƒ Portable Products
ƒ 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 ≤ V_DD ≤ 5.5V, and the DS1731 accuracy is ±1°C from -10°C to +85°C with
3.0V ≤ V_DD ≤ 5.5V. The thermostat on all three devices provides custom hysteresis with user-defined trip
points (T_H and T_L). The T_H and T_L 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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