Data Sheet

[AK9753]

017005237-E-00 2017/04

- 26 -

12.1.5. WRITE Command

When the R/w bit set to “0”, the AK9753 executes a WRITE Operation. The AK9753 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

Figure 12.5. Register Address

The AK9753 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 AK9753 generates an Acknowledge for each byte received. The data transfer is

terminated by a Stop condition, generated by the master device.

MSB LSB

Figure 12.6. Control data

Two or more bytes can be written at once. The AK9753 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…”

SDA

Slave

Address

R/W= 0

ACK

Address(n)

ACK

DATA(n)

DATA(n+1)

DATA(n+x)

Start

Stop

ACK

Figure 12.7. WRITE Operation