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PCA9500 Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. PCA9500
Description  8-bit I2C and SMBus I/O port with 2-kbit EEPROM
Download  21 Pages
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCA9500 Datasheet(HTML) 6 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
PCA9500
8-bit I2C and SMBus I/O port with 2-kbit EEPROM
2004 Sep 30
6
Quasi-bidirectional I/Os (see Figure 8)
A quasi-bidirectional I/O can be used as an input or output without the use of a control signal for data direction. At power-on the I/Os are HIGH.
In this mode, only a current source to VDD is active. An additional strong pull-up to VDD allows fast rising edges into heavily loaded outputs.
These devices turn on when an output is written HIGH, and are switched off by the negative edge of SCL. The I/Os should be HIGH before
being used as inputs.
S
0
1
0
0
A2
A1
A0
0
A
A
A
SDA
SCL
12
34
5
6
7
8
SW00905
ACKNOWLEDGE
FROM SLAVE
R/W
START CONDITION
ACKNOWLEDGE
FROM SLAVE
SLAVE ADDRESS (I/O EXPANDER)
DATA TO PORT
DATA TO PORT
1
I/O3
0
I/O3
P
I/O3
OUTPUT
VOLTAGE
I/O3
PULL-UP
OUTPUT
CURRENT
IOHt
IOH
Figure 8. Transient pull-up current IOHt while I/O3 changes from LOW-to-HIGH and back to LOW


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