PCA9670_2

© NXP B.V. 2007. All rights reserved.

Product data sheet

Rev. 02 — 17 July 2007

8 of 28

NXP Semiconductors

PCA9670

7.2 Software Reset Call, and device ID addresses

Two other different addresses can be sent to the PCA9670.

information.

identification, revision). See Section 7.2.2 “Device ID (PCA9670 ID field)” for more

information.

7.2.1 Software Reset

The Software Reset sequence is defined as following:

3. The PCA9670 device(s) acknowledge(s) after seeing the General Call address

‘0000 0000’ (00h) only. If the R/W bit is set to 1 (read), no acknowledge is returned to

4. Once the General Call address has been sent and acknowledged, the master sends

1 byte. The value of the byte must be equal to 06h.

a. The PCA9670 acknowledges this value only. If the byte is not equal to 06h, the

PCA9670 does not acknowledge it.

If more than 1 byte of data is sent, the PCA9670 does not acknowledge any more.

5. Once the right byte has been sent and correctly acknowledged, the master sends a

STOP command to end the Software Reset sequence: the PCA9670 then resets to

the default value (power-up value) and is ready to be addressed again within the

specified bus free time. If the master sends a Repeated START instead, no reset is

performed.

Fig 7.

General Call address

Fig 8.

Device ID address

0

002aac115

0

0

0

0

0

0

0

R/W

R/W

002aac116

1

1

1

1

1

0

0