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AS7343

I²C Interface

Datasheet

• PUBLIC

DS001046

• v6-00 • 2023-Jun-07

│ 19

9.2

I²C Write Transaction

A Write transaction consists of a START, CHIP-ADDRESSWRITE, REGISTER-ADDRESS WRITE,

DATA BYTE(S), and STOP (P). Following each byte (9TH clock pulse) the slave places an

ACKNOWLEDGE/NOT- ACKNOWLEDGE (A/N) on the bus. If the slave transmits N, the master may

issue a STOP.

Figure 16:

I²C Byte Write

9.3

I²C Read Transaction

A Read transaction consists of a START, CHIP-ADDRESSWRITE, REGISTER-ADDRESS,

RESTART, CHIP-ADDRESSREAD, DATA BYTE(S), and STOP. Following all but the final byte the

master places an ACK on the bus (9TH clock pulse). Termination of the Read transaction is indicated

by a NACK being placed on the bus by the master, followed by STOP.

Figure 17:

I²C Read

9.4

Timing Characteristics

Figure 18:

I²C Timing Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

fSCL

I²C clock frequency

MHz

tBUF

Bus free time between start and stop

condition

1.3

µs

tHD;STA

Hold time after (repeated) start condition.

After this period, the first clock is generated.

0.6

reg_data

WA++

A Sr

data

RA++

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