AS6221 datasheet(27/39 Pages) OSRAM

27 / 39 page

Document Feedback

AS6221

Datasheet

• PUBLIC

DS000751

• v3-00 • 2022-Feb-28

│ 26

6.3.6

Slave Receiver Mode

Any transmission is invoked by the master device by transmitting the slave address with a low R/W bit.

Subsequently, the slave device acknowledges the reception of the valid address by pulling the ninth

bit to a low level. Following to acknowledge, the master transmits the content of the index register.

This transfer is again acknowledged by the slave device. The next data byte(s) are written to the

actual data register which is selected by the index register while each transfer is acknowledged upon a

completed transfer by the slave device. A data transfer can be finished if the master transmits a

START or a STOP condition on the bus.

6.3.7

Slave Transmitter

The master transmits the slave address with a high R/W bit. In turn, the slave acknowledges a valid

slave address. Subsequently, the slave transmits the MSB byte of the actual selected data register by

the index register. After the MSB byte transmission, acknowledge is sent by the master. Afterwards,

the LSB byte is transmitted by the slave which is also acknowledged by the master after the

completed transmission. The data transfer can be terminated by the master by transmitting a Not-

Acknowledge after the transmitted slave data or by invoking a START or a STOP condition on the bus.

6.3.8

Alert Function

If the device is configured for an interrupt mode operation (IM=1), the ALERT output can be used as

an alert signal.

If the polarity bit is

set to ‘0’ (POL=’0’), the alert condition bit is set to ‘0’ in case the temperature has

exceeded the configured value in register THIGH. Accordingly, the alert condition bit is set to ‘1’ if the

temperature has fallen below the configured value in register TLOW.

If the polarity bit is set to ‘1’ (POL=’1’), the alert condition bit is inverted. The following table

summarizes the status of the alert condition bit with different alert conditions and polarity

configurations.

Figure 29:

Alert Condition Bit

Polarity Bit

Alert Condition

Alert Condition Bit (AC-Bit)

T ≥ THIGH

T ≤ TLOW

T ≥ THIGH

T ≤ TLOW

AS6221 Scheda tecnica(PDF) 27 Page - OSRAM GmbH

AS6221 Scheda tecnica(HTML) 27 Page - OSRAM GmbH

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

Scheda tecnica Scarica

Link URL