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AS6221T

Register Description

Datasheet

• PUBLIC

DS001032

• v1-00 • 2022-Apr-08

37

│ 27

6.3.10

General Call

A general call is issued by the master by transmitting the general call address (000 0000) with a low

R/W bit. When this command is issued on the bus, the device acknowledges this command. The

device also acknowledges the second byte but ignores the data. Subsequent bytes sent by the master

during the general call are not acknowledged.

6.3.11

Start Byte

When

the master transmits address 000 0000 and a high R/W bit (“START byte”) the device

acknowledges the address. The device then send the MSB data byte and LSB data byte, where the

data corresponds to the content of the register whose address has been last written to. After reset this

corresponds to the temperature register.

6.3.12

Timeout Function

The serial interface of the slave device is reset if the clock signal SCL is kept low for typ. 30 ms. Such

a condition results in a release of the data line by the slave in case it has been pulled to low level. The

slave remains inactive after a timeout and waits for a new START command invoked by the bus

master. In order to prevent a timeout, the bus transfer rate must be higher than 1 kHz.

6.3.13

Bus Conditions

The following conditions occur on the serial bus which is compatible to the I²C-Bus.

Bus Idle

The signals SDA and SCL are not actively driven and pulled to a high level by an external pull-up

resistor.

Start Data Transfer

A transition of the SDA input from high to low level while the SCL signal is kept at high level results in

a START condition. Such a START condition must precede any data transfer.

Stop Data Transfer

A transition of the SDA input from low to high level while the SCL signal is kept at high level results in

a STOP condition. Any data transfer is finished by generating a STOP or START condition.

Data Transfer

The master device defines the number of data bytes between a START and STOP condition and there

is no limitation in the amount of data to be transmitted.