AS7221 datasheet(19/36 Pages) AMSCO

部件名	AS7221

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

PDF	36 Pages

Scroll/Zoom	100%

制造商	AMSCO [ams AG]

网页	http://www.ams.com

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19 / 36 page

ams Datasheet

Page 19

[v1-01] 2016-Dec-08

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AS7221 − Detailed Description

I²C Master Interface (Local Sensor Interface)

The I²C Master interface can be used to connect external sensors

(such as daylight, occupancy, CO sensors, etc.). Refer to the

separate ams Application Note for external sensor usage with

the AS7221.

I²C Feature List

Clock is set to 100kHz

7+1-bit addressing mode.

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

Read formats: Random-Read, Sequential-Read

SDA input delay and SCL spike filtering by integrated

RC-components.

I²C Protocol

Figure 22:

I²C Symbol Definition

The above I²C symbol definition table describes the symbols

used in the following mode descriptions.

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

NNo 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

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