DS1631A Datasheet PDF - Dallas
| Part Number | DS1631A | |
| Description | High-Precision Digital Thermometer and Thermostat | |
| Manufacturers | Dallas | |
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DS1631/DS1631A/DS1731
High-Precision Digital
Thermometer and Thermostat
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
μSOP Packages and the DS1631 is Also
Available in a 150mil SO package—see
Table 1 for Ordering Information
PIN CONFIGURATIONS
SDA 1
8 VDD
SCL 2
7 A0
TOUT
3
6 A1
GND
45
μSOP
A2
(DS1631U+, DS1631AU+,
DS1731U+)
SDA 1
8 VDD
SCL
TOUT
GND
2
3
4
7 A0
6 A1
5 A2
SO (150mil and 208mil)
(DS1631Z+, DS1631S+)
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
AC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETER SYMBOL CONDITION
MIN TYP MAX UNITS NOTES
9-bit resolution
93.75
Temperature
Conversion Time
10-bit
resolution
tTC 11-bit
resolution
187.5
375
ms
12-bit
resolution
750
SCL Frequency
Bus Free Time
fSCL
0 400 kHz
Between a STOP and
START Condition
tBUF
1.3 µs 5
START and Repeated
START Hold Time
from Falling SCL
tHD:STA
0.6 µs 5, 6
Low Period of SCL
High Period of SCL
tLOW
tHIGH
1.3 µs 5
0.6 µs 5
Repeated START
Condition Setup Time
to Rising SCL
tSU:STA
0.6 µs 5
Data-Out Hold Time
from Falling SCL
tHD:DAT
0
0.9 µs
5
Data-In Setup Time to
Rising SCL
tSU:DAT
100 ns 5
Rise Time of SDA and
SCL
tR
20 + 0.1CB
1000 ns
5, 7
Fall Time of SDA and
SCL
tF
20 + 0.1CB
300 ns
5, 7
STOP Setup Time to
Rising SCL
tSU:STO
0.6 µs 5
Capacitive Load for
Each Bus Line
CB
400 pF
I/O Capacitance
Input Capacitance
Spike Pulse Width that
CI/O
CI
10 pF
5 pF
can be Suppressed by
Input Filter
tSP
0 50 ns
NOTES:
1) All voltages are referenced to GND.
2) See Figure 2 for Typical Operating Curves.
3) Specified with TOUT pin open; A0, A1, A2 = 0V or VDD; and fSCL ≥ 2Hz.
4) 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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| Information | Total 6 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DS1631A.PDF Datasheet ] | |
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