参数资料
| 型号： | PCA9501D,112 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 26/28页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 20SOIC |
| 标准包装： | 38 |
| 接口： | I²C，SM 总线 |
| 输入/输出数： | 8 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 2.5 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SO |
| 包装： | 管件 |
| 包括： | EEPROM |
| 配用： | 568-4002-ND - DEMO BOARD I2C |
| 其它名称： | 568-3353-5 935272364112 PCA9501D |
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PCA9501_4
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 10 February 2009
7 of 28
NXP Semiconductors
PCA9501
8-bit I2C-bus and SMBus I/O port with interrupt, 2-kbit EEPROM
7.3.1 Quasi-bidirectional I/Os
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. See Figure 9.
7.3.2 Interrupt
The PCA9501 provides an open-drain output (INT) which can be fed to a corresponding
input of the microcontroller. This gives these chips a type of master function which can
initiate an action elsewhere in the system. See Figure 10.
An interrupt is generated by any rising or falling edge of the port inputs in the input mode.
Resetting and reactivating the interrupt circuit is achieved when data on the port is
changed to the original setting or data is read from or written to the port which has
generated the interrupt.
Resetting occurs as follows:
In the Read mode at the acknowledge bit after the rising edge of the SCL signal
In the Write mode at the acknowledge bit after the HIGH-to-LOW transition of the SCL
signal
Returning of the port data to its original setting
Interrupts which occur during the acknowledge clock pulse may be lost (or very short)
due to the resetting of the interrupt during this pulse.
Each change of the I/Os after resetting will be detected and, after the next rising clock
edge, will be transmitted as INT. Reading from or writing to another device does not affect
the interrupt circuit.
Fig 9.
Transient pull-up current (IOHt) while IO3 changes from LOW to HIGH and back to LOW
0
A
S
slave address (I/O expander)
START condition
R/W
acknowledge
from slave
002aad292
1
data to port
A
acknowledge
from slave
12345678
SCL
9
SDA
0
A
IO3 output voltage
IO3 pull-up output current
acknowledge
from slave
data to port
A5 A4 A3 A2 A1 A0
0
IO3
P
STOP
condition
IO3
IOHt
IOH
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