AS7150 datasheet(52/159 Pages) AMSOSRAM

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AS7150

Functional description

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DS001130 • v3-00 • 2026-Jan-26

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Figure 39: I²C sequential read format

Sequential Read is the extended form of Random Read, as more than one register-data byte is

subsequently transferred. In contrast to the Random Read, for a sequential read, the

transferred register-data bytes are responded to with an acknowledge from the master. The

number of data bytes transferred in one sequence is unlimited (consider the behavior of the

word-address counter). To terminate the transmission, the master has to send a “not-

acknowledge” following the last data byte and subsequently generate the STOP condition.

Figure 40: I²C current address read format

To keep the access time as small as possible, this format allows a read access without the

word address transfer in advance to the data transfer. The bus is idle, and the master issues a

START condition, followed by the Device-Read address. Analogous to Random Read, a single

byte transfer is terminated with a “not-acknowledge” after the first register byte. Analogous to

Sequential Read, an unlimited number of data bytes can be transferred - where the data bytes

have to be responded to with an acknowledge from the master. For termination of the

transmission, the master sends a “not-acknowledge” following the last data byte and a

subsequent STOP condition.

A Sr

data 1

data 2

...

data n

RA++

data 1

data 2

...

data n

RA++

AS7150 Datasheet(PDF) 52 Page - ams-OSRAM AG