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PDF DS1731 Data sheet ( Hoja de datos )
| Número de pieza | DS1731 | |
| Descripción | High-Precision Digital Thermometer and Thermostat | |
| Fabricantes | Dallas | |
| Logotipo |  |
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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
DS1631/DS1631A/DS1731
High-Precision Digital
Thermometer and Thermostat
PIN CONFIGURATIONS
SDA
SCL
TOUT
GND
1
2
3
4
8 VDD
7 A0
6 A1
5 A2
mSOP
(DS1631U, DS1631AU, DS1731U)
SDA 1
8 VDD
SCL 2
7 A0
TOUT
3
6 A1
GND 4
5 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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1 page  
DS1631/DS1631A/DS1731
EEPROM AC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V; TA = -55°C to +125°C.)
PARAMETER
SYMBOL CONDITION MIN TYP MAX UNITS
EEPROM Write Cycle Time
EEPROM Writes
twr
NEEWR
-55°C to +55°C
50k
4
10 ms
Writes
EEPROM Data Retention
tEEDR
-55°C to +55°C 10
Years
Figure 2. TYPICAL OPERATING CURVES
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
0
DS1631/DS1631A
+3s
Mean
-3s
10 20 30 40 50 60
REFERENCE TEMPERATURE (°C)
70
DS1731
0.8
0.6
0.4
+3 s
0.2
0 Mean
-0.2
-0.4
-0.6 -3 s
-0.8
-10 0 10 20 30 40 50 60 70
REFERENCE TEMPERATURE (°C)
80
Figure 3. TIMING DIAGRAM
All timing is referenced to 0.9 x VDD and 0.1 x VDD.
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Figure 8. START, STOP, AND ACK SIGNALS
DS1631/DS1631A/DS1731
SDA
SCL
START
Condition
…
…
ACK (or NACK) STOP
From Receiver Condition
GENERAL 2-WIRE INFORMATION
§ All data is transmitted MSb first over the 2-wire bus.
§ One bit of data is transmitted on the 2-wire bus each SCL period.
§ A pullup resistor is required on the SDA line and, when the bus is idle, both SDA and SCL must remain
in a logic-high state.
§ All bus communication must be initiated with a START condition and terminated with a STOP
condition. During a START or STOP is the only time SDA is allowed to change states while SCL is
high. At all other times, changes on the SDA line can only occur when SCL is low: SDA must remain
stable when SCL is high.
§ After every 8-bit (1-byte) transfer, the receiving device must answer with an ACK (or NACK), which
takes one SCL period. Therefore, nine clocks are required for every one-byte data transfer.
INITIATING 2-WIRE COMMUNICATION
To initiate 2-wire communication, the master generates a START followed by a control byte containing
the DS1631, DS1631A, or DS1731 slave address. The R/･W･ bit of the control byte must be a 0 (“write”)
since the master next writes a command byte. The DS1631/DS1631A/DS1731 responds with an ACK
after receiving the control byte. This must be followed by a command byte from the master, which
indicates what type of operation is to be performed. The DS1631/DS1631A/DS1731 again respond with
an ACK after receiving the command byte.
If the command byte is a Start Convert T or Stop Convert T command (see Figure 9a), the transaction is
finished, and the master must issue a STOP to signal the end of the communication sequence. If the
command byte indicates a write or read operation, additional actions must occur as explained in the
following sections.
2-WIRE WRITES
The master can write data to the DS1631/DS1631A/DS1731 by issuing an Access Config, Access TH, or
Access TL command following the control byte (see Figures 9b and 9d). Since the R/･W･ bit in the control
byte was a 0 (“write”), the DS1631/DS1631A/DS1731 are already prepared to receive data. Therefore,
after receiving an ACK in response to the command byte, the master device can immediately begin
transmitting data. When writing to the configuration register, the master must send one byte of data, and
when writing to the TH or TL registers the master must send two bytes of data. After receiving each data
byte, the DS1631/DS1631A/DS1731 respond with an ACK, and the transaction is finished with a STOP
from the master.
11 of 14
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet DS1731.PDF ] | |
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