AK9750 Datasheet, PDF (26/49 Pages) Asahi Kasei Microsystems – IR Sensor IC with I2C I/F

[AK9750]
12.1.5. WRITE Command
When the R/w bit set to “0”, the AK9750 executes a WRITE Operation. The AK9750 will out an
Acknowledge signal and receive the second byte, after receiving a Start condition and first one byte
(Slave address) in a WRITE Operation. The second byte has an MSB-first configuration, and specifies
the address of the internal control register.
MSB
LSB
A7 A6 A5 A4 A3 A2 A1 A0
Figure 12.5. Register Address
The AK9750 will generate an Acknowledge and receive the third byte after receiving the second byte
(Register Address).
The data after the third byte is the control data. The control data consists of 8-bit and has an MSB-first
configuration. The AL9750 generates an Acknowledge for each byte received. The data transfer is
terminated by a Stop condition, generated by the master device.
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
Figure 12.6. Control data
Two or more bytes can be written at once. The AK9750 generates an Acknowledge and receives the
next data after receiving the third byte (Control Data). When the following data is transmitted without a
Stop condition, after transmitting one byte, the internal address counter is automatically incremented,
and data is written in the next address.
The automatic increment function works in the address from 11H to 1CH.Wthen the start address is
“11H”, the address is repeatedly incremented as. “11H -> 12H ->…..-> 1CH -> 11H -> 12H…”
R/W= 0
SDA
S ^Slave
Address
Register
Address(n) ^{DATA(n) DATA(n+1)}
DATA(n+x) ^P
Figure 12.7. WRITE Operation
015002896-E-01
- 26 -
2015/10