Datasheet

PCA9675 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 2 — 3 October 2011 11 of 34
NXP Semiconductors
PCA9675
Remote 16-bit I/O expander for Fm+ I
2
C-bus with interrupt
Fig 11. PCA9675 ID
If more than 2 bytes are read, the slave device loops back to the first byte (manufacturer byte) and
keeps sending data until the master generates a ‘no acknowledge’.
Fig 12. Device ID field reading
0
002aab639
0 0revision
0
0 1 0 0 1 1 00part identification
0
0 0 0 0 0 0 0
0 0 0 0
manufacturer
category identification feature identification
002aab663
1 1 1 1 0 0 0 AS 1
device ID address
START condition R/W
acknowledge from one
or several slave(s)
A5 A4 A3 A2 A1 A0 XA6 A 1 1 1 1 0 0 11
device ID address
A
I
2
C-bus slave address of
the device to be identified
don't care
acknowledge from
slave to be identified
acknowledge from
slave to be identified
R/W
M6 M5 M4M7 M2 M1 M0M3 A
acknowledge
from master
C5 C4 C3C6 C1 C0 F5C2 A
acknowledge
from master
manufacturer name
= 00000000
P3 P2 P1F4 P0 R2 R1 R0
revision = 000
feature identification
= 001100
A P
STOP
condition
no acknowledge
from master
category identification
= 0000001