SI7050-A20 Datasheet, PDF (12/26 Pages) Silicon Laboratories – IC TEMPERATURE SENSORS

Si7050/3/4/5-A20
5. I²C Interface
The Si705x communicates with the host controller over a digital I²C interface. The 7-bit base slave address is
0x40. When sending commands to the device, the R/W bit is set high for a read command and low for a write
command.
Table 8. I²C Slave Address Byte
A6
A5
A4
A3
A2
A1
A0
R/W
1
0
0
0
0
0
0
0
Master I²C devices communicate with the Si705x using a command structure. The commands are listed in the I²C
command table. Commands other than those documented below are undefined and should not be sent to the
device. When sending commands to the device, the R/W bit is set high for a read command and low for a write
command.
Table 9. I²C Command Table
Command Description
Measure Temperature, Hold Master Mode
Measure Temperature, No Hold Master Mode
Reset
Write User Register 1
Read User Register 1
Read Electronic ID 1st Byte
Read Electronic ID 2nd Byte
Read Firmware Revision
Command Code
0xE3
0xF3
0xFE
0xE6
0xE7
0xFA 0x0F
0xFC 0xC9
0x84 0xB8
12
Rev. 1.0