AK9750 Datasheet, PDF (23/49 Pages) Asahi Kasei Microsystems – IR Sensor IC with I2C I/F

[AK9750]
12. Serial Interface
The I²C bus interface of the AK9750 supports Standard Mode (Max. 100kHz) and High Speed Mode
(Max. 400kHz).
12.1. Data Transfer
Initially the start condition should be input to access the AK9750 through the bus. Next, send a one byte
slave address, which includes the device address. The AK9750 compares the a¥slave address, and if
these addresses match, the AK9750 generates an acknowledge signal and executes a Read / Write
command. The stop condition should be input after executing a command.
12.1.1. Changing state of the SDA line
The SDA line state should be changed only while the SCL line is “L”. The SDA line state must be
maintained while the SCL line is “H”. The SDA line state can be changed while the SCL line is “H”, only
when a Start Condition or a Stop Condition is input.
SCL
SDA
Constant
Changing Stare
Enable
Figure 12.1.Changing state of SDA line
12.1.2. Start / Stop Conditions
A Start Condition is generated when the SDA line state is changed from “H” to “L” while the SCL line is
“H”. All command start from a Start condition.
A Stop condition is generated when the SDA line state is changed from “L” to “H” while the SCL line is
“H”. All command end after a Stop condition.
SCL
SDA
Start Condition
Stop Condition
Figure 12.2. Start / Stop Conditions
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