STTS751 STMicroelectronics, STTS751 Datasheet - Page 14

• Manufacturer Part Number: STTS751
• Description: 2.25 V low-voltage local digital temperature sensor
• Manufacturer: STMicroelectronics

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STTS751 register summary
4.1
Table 10.
Note:
4.2
Table 11.
14/36
START
ADDR
(hex)
00
02
R/W
ADDRESS
1001_000
R
R
SLAVE
STTS751 register formats and details
The STTS751 register set is comprised of the 16 addresses shown in
individual registers are accessed by transferring their addresses via the SMBus interface as
shown in
(Section
byte sequence.
An example read sequence of the Therm hysteresis register, address 21h, with its default
value, 0Ah, is shown below. The slave address used is 90h. The gray data is sent by the
STTS751 while the white data is sent by the host.
Pointer register format
All eight bits are used to select the register.
Temperature register format
The temperature data is a 12-bit number and is stored in two's complement format spanning
the high byte and low byte registers as shown in
Temperature register (two’s complement)
The integer portion of the temperature is stored in the high byte, and the fractional portion in
the low byte. The lower four bits of the low byte will always read 0. At power-up, the
STTS751 defaults to 10-bit resolution. Thus, bits b5 and b4 of the lower byte will also read 0
until the device is configured to a higher resolution (via the Tres bits in the configuration
register).
Temperature - high byte
Temperature - low byte
WR ACK
Register
3.5) the address used is the address sent in the previous WRITE, READ or SEND
0
Section
3.2, 3.3, and 3.4. In the case of the RECEIVE byte sequence
REGISTER
0010_0001
ADDRESS
½
sign
b7
°C
Doc ID 16483 Rev 5
ACK START
64 °C
¼ °C
b6
32 °C
1
/
b5
8
°C
ADDRESS
1001_000
SLAVE
1
16 °C
/
16
Table
b4
°C
11.
8 °C
RD ACK
b3
1
0
4°C
b2
0
0000_1010
2 °C 1 °C
DATA
b1
0
Table
b0
0
9. The
NACK STOP
Power-up
STTS751
default
(hex)
00
00