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AS7225

I²C Slave Interface

Datasheet

• PUBLIC

DS000496

• v2-00 • 2019-Jun-28

│ 18

I²C Slave Interface

Interface and control can be accomplished through an I²C compatible slave interface to a set of

registers that access device control functions and output data. These control and output registers on

the AS7225 are, in reality, implemented as virtual registers in software. The actual I²C slave hardware

registers number only three and are described in the table below. The steps necessary to access the

virtual registers defined in the pages that follow are explained in pseudocode for external I²C master

writes and reads below. A compatible companion Flash device must be incorporated and pre-

programmed for I²C virtual-registers to function.

8.1

I²C Feature List

●

Fast mode (400 kHz) and standard mode (100 kHz) support

●

7+1-bit addressing mode

●

Write format: Byte

●

Read format: Byte

Figure 13:

I²C Slave Device Address and Physical Registers

Entity

Description

Note

Device Slave

Address

8-bit slave address

Byte = 1001001x (device address = 49 h)

x= 1 for Master Read (byte = 93 h)

x= 0 for Master Write (byte = 92 h)

STATUS Register

I²C slave interface

STATUS register

Read-only

Bit 1: TX_VALID

0 -> New data may be written to WRITE register

1 -> WRITE register occupied. Do NOT write.

Bit 0: RX_VALID

0 -> No data is ready to be read in READ register.

1 -> Data byte available in READ register.

WRITE Register

I²C slave interface

WRITE register

Write-only

8 bits of data written by the I²C Master intended for

receipt by the I²C slave. Used for both virtual register

addresses and write data.

READ Register

I²C slave interface

READ register

Read-only

8 bits of data to be read by the I²C Master.

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