pca9501 NXP Semiconductors, pca9501 Datasheet - Page 7

• Manufacturer Part Number: pca9501
• Description: 8-bit I2c And Smbus I/o Port With Interrupt, 2-kbit Eeprom And 6 Address Pins
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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 V
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.
2004 Sep 30
8-bit I
2-kbit EEPROM and 6 address pins
I/O3
OUTPUT
VOLTAGE
I/O3
PULL-UP
OUTPUT
CURRENT
2
SDA
SCL
C and SMBus I/O port with interrupt,
START CONDITION
Figure 8. Transient pull-up current I
S
SLAVE ADDRESS (I/O EXPANDER)
0
1
A
2
5
A
3
4
A
4
3
DD
A2 A1
5
is active. An additional strong pull-up to V
6
A0
7
R/W
0
8
A
ACKNOWLEDGE
FROM SLAVE
OHt
while I/O3 changes from LOW-to-HIGH and back to LOW
DATA TO PORT
7
I/O3
1
DD
I
OHt
allows fast rising edges into heavily loaded outputs.
A
ACKNOWLEDGE
FROM SLAVE
DATA TO PORT
I/O3
0
PCA9501
A
Product data sheet
I
OH
P
SW00904