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PDF DS1631 Data sheet ( Hoja de datos )
| Número de pieza | DS1631 | |
| Descripción | Accuracy Digital Thermometer and Thermostat | |
| Fabricantes | Dallas | |
| Logotipo |  |
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DS1631
±0.5°C Accuracy Digital
Thermometer and Thermostat
FEATURES
§ Temperature measurements require no
external components
§ Measures temperatures from -55°C to +125°C
(-67°F to +257°F)
§ ±0.5°C accuracy over a range of 0°C to
+70°C
§ 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 a 2-wire serial
interface (SDA and SCL pins)
§ Applications include thermostatic controls,
industrial systems, consumer products,
thermometers, or any thermally sensitive
system
§ Available in 8-pin mSOP, SO (150mil and
208mil), and PDIP packages (see Table 1 for
ordering information)
PIN ASSIGNMENT
SDA 1
8 VDD
SCL 2
7 A0
TOUT
3
6 A1
GND 4
5 A2
DS1631Z—8-pin SO (150mil)
SDA
SCL
TOUT
GND
1
2
3
4
8 VDD
7 A0
6 A1
5 A2
DS1631U—mSOP
Note: Pin assignments for the
DS1631S (208mil 8-Pin SO) and
DS1631 (8-Pin PDIP) are the same
as for the DS1631Z.
PIN DESCRIPTION
SDA - Open-Drain Data I/O
SCL - Clock Input
TOUT - Thermostat Output
GND - Ground
VDD - Power Supply
A0 - Address Input
A1 - Address Input
A2 - Address Input
DESCRIPTION
The DS1631 digital thermometer and thermostat provides 9-, 10-, 11-, or 12-bit digital temperature
readings over a range of -55°C to +125°C. The thermometer accuracy is ±0.5°C from 0°C to +70°C with
3.0V £ VDD £ 5.5V. The thermostat provides custom hysteresis with user-defined trip points (TH and TL).
The thermostat output (TOUT) becomes active when the temperature of the device exceeds the upper
thermostat trip point (TH), and remains active until the temperature drops below the lower thermostat trip
point (TL).
The TH and TL registers and thermometer configuration settings are stored in NV EEPROM so the
DS1631 can be programmed prior to installation. Communication with the DS1631 is achieved through a
standard 2-wire serial interface.
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071502
1 page  
THERMOSTAT OUTPUT OPERATION Figure 3
Logic 1
POL=1 (TOUT is active high)
TOUT
DS1631
Logic 0
TL
TH Temp
CONFIGURATION REGISTER
The configuration register allows the user to program various DS1631 options such as conversion
resolution, TOUT polarity, and operating mode. It also provides information to the user about conversion
status, EEPROM activity, and thermostat activity. The configuration register is arranged as shown in
Figure 4 and detailed descriptions of each bit are provided in Table 6. This register can be read from and
written to using the Access Config command. Note that the POL and 1SHOT bits are stored in EEPROM
and all other configuration register bits are SRAM.
CONFIGURATION REGISTER Figure 4
MSb bit 6
DONE THF
*NV (EEPROM)
bit 5
TLF
bit 4
NVB
bit 3
R1
bit 2 bit 1
LSb
R0 POL* 1SHOT*
RESOLUTION CONFIGURATION Table 5
R1 R0 RESOLUTION CONVERSION
TIME (MAX)
00
9-bit
93.75ms
01
10-bit
187.5ms
10
11-bit
375ms
11
12-bit
750ms
START, STOP, AND ACK SIGNALS Figure 5
SDA
SCL
START
Condition
…
…
ACK (or NACK) STOP
From Receiver Condition
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5 Page 
DS1631
NOTES:
1) If only one byte of temperature data is needed, the master can issue a NACK followed by a STOP
after reading the first data byte, and the DS1631 will quit transmitting data.
2) After issuing a write command, no further writes should be requested for at least 10ms due to the
EEPROM write cycle time.
3) Data direction depends upon R/ W bit in the 2-wire control byte.
DS1631 OPERATION EXAMPLE
In this example, the master configures the DS1631 (A1A2A3 = 000) for continuous conversions and
thermostatic function.
MASTER
MODE
TX
TX
RX
TX
RX
TX
DS1631
MODE
RX
RX
TX
RX
TX
RX
RX TX
TX RX
TX RX
RX TX
TX RX
RX TX
TX RX
RX TX
TX RX
RX TX
TX RX
TX RX
RX TX
TX RX
RX TX
TX RX
RX TX
TX RX
RX TX
TX RX
TX RX
RX TX
TX RX
RX TX
TX RX
DATA
(MSb first)
START
90h
ACK
ACh
ACK
02h
ACK
START
90h
ACK
A1h
ACK
28h
ACK
00h
ACK
START
90h
ACK
A2h
ACK
0Ah
ACK
00h
ACK
START
90h
ACK
51h
ACK
STOP
COMMENTS
Master issues a START condition.
Master sends control byte with R/¯W¯ = 0.
DS1631 generates acknowledge bit.
Master sends Access Config command.
DS1631 generates acknowledge bit.
Master writes a data byte to the configuration register to
put the DS1631 in continuous conversion mode and set the
TOUT polarity to active high.
DS1631 generates acknowledge bit.
Master generates a repeated START condition.
Master sends control byte with R/¯W¯ = 0.
DS1631 generates acknowledge bit.
Master sends Access TH command.
DS1631 generates acknowledge bit.
Master sends most significant data byte for TH = +40°C.
DS1631 generates acknowledge bit.
Master sends least significant data byte for TH = +40°C.
DS1631 generates acknowledge bit.
Master generates a repeated START condition.
Master sends control byte with R/¯W¯ = 0.
DS1631 generates acknowledge bit.
Master sends Access TL command.
DS1631 generates acknowledge bit.
Master sends most significant data byte for TL = +10°C.
DS1631 generates acknowledge bit.
Master sends least significant data byte for TL = +10°C.
DS1631 generates acknowledge bit.
Master generates a repeated START condition.
Master sends control byte with R/¯W¯ = 0.
DS1631 generates acknowledge bit.
Master sends Start Convert T command.
DS1631 generates acknowledge bit.
Master issues a STOP condition.
11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet DS1631.PDF ] | |
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