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AS7225

I²C Master Interface (Local Sensor Interface)

Datasheet

• PUBLIC

DS000496

• v2-00 • 2019-Jun-28

│ 26

I²C Master Interface (Local Sensor

Interface)

The I²C Master interface can be used to connect external sensors such as the current TSL25721 or

legacy TSL45315 ambient light sensor (or other external sensors with AS7225 native support). Once

the AS7225 has detected the supported ambient light sensor, daylight-responsive dimming directives

can be activated by using the ATCHANMOD command or DIR_CONF register.

9.1

I²C Feature List

●

Clock is set to 400 kHz

●

7+1-bit addressing mode.

●

Write formats: Single-Byte-Write, Page-Write

●

Read formats: Random-Read, Sequential-Read

9.2

I²C Protocol

Figure 17:

I²C Symbol Definition

Symbol

Definition

Note

Start condition after stop

1-bit

Repeated start

1-bit

Slave address for write

Slave address

Slave address for read

Slave address

Word address

8-bit

Acknowledge

1-bit

No Acknowledge

1-bit

Data

Data/write

8-bit

Data(n)

Data/read

8-bit

Stop condition

1-bit

WA++

Slave increment word address

During acknowledge

The above I²C symbol definition table describes the symbols used in the following Read and Write

descriptions.

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