AS7221 datasheet(21/36 Pages) AMSCO

Part #	AS7221

Description	Calibrated XYZ tri-stimulus color sensing for direct translation to CIE 1931/1976 standard observer color MAPS

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	AMSCO [ams AG]

Direct Link	http://www.ams.com

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21 / 36 page

ams Datasheet

Page 21

[v1-01] 2016-Dec-08

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AS7221 − Detailed Description

I²C Read Access

Random, Sequential and Current Address Read are used to read

data from the slave.

Figure 25:

I²C Random Read

Random Read and Sequential Read are combined formats. The

repeated START condition is used to change the direction after

the data transfer from the master.

The word address transfer is initiated with a START condition

issued by the master while the bus is idle. The START condition

is followed by the device-write address and the word address.

In order to change the data direction a repeated START

condition is issued on the 1st SCL pulse after the acknowledge

bit of the word address transfer. After the reception of the

device-read address, the slave becomes the transmitter. In this

state the slave transmits register data located by the previous

received word address vector. The master responds to the data

byte with a not-acknowledge, and issues a STOP condition on

the bus.

Data

N P

WA++

read WA++

AS7221 Datasheet(PDF) 21 Page - ams AG