pca9671 NXP Semiconductors, pca9671 Datasheet - Page 13

• Manufacturer Part Number: pca9671
• Description: Remote 16-bit I/o Expander For Fm+ I2c-bus With Reset
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9671_1
Product data sheet
Fig 16. Write mode (output)
SDA
SCL
data output from port
P05 output voltage
P05 pull-up ouput current
P16 output voltage
P16 pull-up ouput current
write to port
S A6
START condition
1
A5 A4 A3 A2 A1 A0 0
2
8.3 Reading from a port (Input mode)
slave address
3
4
All ports programmed as input should be set to logic 1. To read, the master
(microcontroller) first addresses the slave device after it receives the interrupt. By setting
the last bit of the byte containing the slave address to logic 1 the Read mode is entered.
The data bytes that follow on the SDA are the values on the ports.
If the data on the input port changes faster than the master can read, this data may be
lost.
5
6
7
R/W
8
9
A
acknowledge
from slave
07
P
06 1
P
Rev. 01 — 20 December 2006
data to port 0
P05
04
P
03
P
02
Remote 16-bit I/O expander for Fm+ I
P
01
P
I
trt(pu)
00
P
A
acknowledge
from slave
17
P
t
v(Q)
I
1
P16
OH
DATA A0 AND B0 VALID
15
P
data to port 1
14
P
13
P
12
P
11
I
P
trt(pu)
10
P
A
acknowledge
from slave
data A0 and B0 valid
PCA9671
t
© NXP B.V. 2006. All rights reserved.
2
v(Q)
I
C-bus with reset
OH
002aac250
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