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参数资料
| 型号： | 935272364112 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 256 X 8 EEPROM, 8 I/O, PIA-GENERAL PURPOSE, PDSO20 |
| 封装： | PLASTIC, SOT-163-1, SO-20 |
| 文件页数： | 17/20页 |
| 文件大小： | 125K |
| 代理商： | 935272364112 |
Philips Semiconductors
Product data
PCA9501
8-bit I2C and SMBus I/O port with interrupt,
2-kbit EEPROM and 6 address pins
2002 Sep 27
6
Quasi-bidirectional I/Os (see Figure 7)
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
A2
A1
A0
0
A
SDA
SCL
12
34
5
6
7
8
SW00904
ACKNOWLEDGE
FROM SLAVE
R/W
START CONDITION
ACKNOWLEDGE
FROM SLAVE
SLAVE ADDRESS (I/O EXPANDER)
DATA TO PORT
1
I/O3
0
I/O3
P
I/O3
OUTPUT
VOLTAGE
I/O3
PULL-UP
OUTPUT
CURRENT
IOHt
IOH
A5
A4 A3
Figure 7. Transient pull-up current IOHt while I/O3 changes from LOW-to-HIGH and back to LOW
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