BU9817FV Datasheet, PDF (11/15 Pages) Rohm – 4-channel temperature sensor IC for PCs with I2C BUS interface

Multimedia ICs
!Circuit operation
Register structure
BU9817FV
1ch Configuration Register
1ch Vdl Register
1ch Vul Register
1ch ADV Register
SDA
SCL
I²C BUS
Interface
Pointer
Register
(Register select)
2ch Configuration Register
2ch Vdl Register
2ch Vul Register
2ch ADV Register
3ch Configuration Register
3ch Vdl Register
3ch Vul Register
3ch ADV Register
4ch Configuration Register
4ch Vdl Register
4ch Vul Register
4ch ADV Register
I²C Bus data structure
(1) Write Mode
S
Address
— _{W A Pointer reg. Byte}
A
Write Data Byte
AP
(2) Read Mode
1) Pointer register set
S
Address
—_{W A Pointer reg. Byte}
A
Sr
Address
R A Read Data Byte
—_{A P}
2) Preset pointer register
S
Address
RA
Read Data Byte
—_{A P}
S: Start condition
P: Stop condition
Sr: Restart condition
A: acknowledge
—_{A: acknowledge bar}