DS1631Z+T&R Maxim Integrated Products, DS1631Z+T&R Datasheet - Page 12
![IC THERMOMETER DIG HI-PREC 8SOIC](/photos/1/39/13902/8-soic_21-0042b_sml.jpg)
DS1631Z+T&R
Manufacturer Part Number
DS1631Z+T&R
Description
IC THERMOMETER DIG HI-PREC 8SOIC
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1631U.pdf
(15 pages)
Specifications of DS1631Z+T&R
Function
Thermometer, Thermostat
Topology
ADC (Sigma Delta), Comparator, Register Bank
Sensor Type
Internal
Sensing Temperature
-55°C ~ 125°C
Output Type
I²C™/SMBus™
Output Alarm
Yes
Output Fan
No
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-55°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Full Temp Accuracy
+/- 2 C
Digital Output - Bus Interface
Serial (2-Wire)
Digital Output - Number Of Bits
12 bit
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Figure 8. START, STOP, AND ACK SIGNALS
GENERAL 2-WIRE INFORMATION
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/
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/
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 T
byte, the DS1631/DS1631A/DS1731 respond with an ACK, and the transaction is finished with a STOP
from the master.
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.
SDA
SCL
H
or T
Condition
L
START
registers the master must send two bytes of data. After receiving each data
12 of 15
…
…
ACK (or NACK)
W ¯ ¯
From Receiver
bit of the control byte must be a 0 (“write”)
Condition
STOP
DS1631/DS1631A/DS1731
W ¯ ¯
bit in the control