参数资料
型号: PCA8574TS,118
厂商: NXP Semiconductors
文件页数: 6/32页
文件大小: 0K
描述: IC I/O EXPANDER I2C 8B 20SSOP
特色产品: NXP - I2C Interface
标准包装: 1
接口: I²C
输入/输出数: 8
中断输出:
频率 - 时钟: 400kHz
电源电压: 2.3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-LSSOP(0.173",4.40mm 宽)
供应商设备封装: 20-SSOP
包装: 标准包装
包括: POR
其它名称: 568-8700-6
PCA8574_PCA8574A
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 3 June 2013
14 of 32
NXP Semiconductors
PCA8574; PCA8574A
Remote 8-bit I/O expander for I2C-bus with interrupt
while (INT == 1);
//Monitor the interrupt pin. If INT = 1 do nothing
//When INT = 0 then read input ports
<S> <slave address read> <ACK> <1010 0010> <NACK> <P> //Read PCA8574 data
If (P0 == 0)
//Temperature sensor activated
{
// write to PCA8574 with data 0010 1011b to turn on LED (P7), on Switch (P3)
and keep P[1:0] as input ports.
<S> <0100 0000> <ACK> <0010 1011> <ACK> <P> // Write to PCA8574
}
10.3 High current-drive load applications
The GPIO has a minimum guaranteed sinking current of 25 mA per bit at 4.5 V. In
applications requiring additional drive, two port pins may be connected together to sink up
to 50 mA current. Both bits must then always be turned on or off together. Up to 8 pins can
be connected together to drive 200 mA, which is the device recommended total limit.
Each pin needs its own limiting resistor as shown in Figure 16 to prevent damage to the
device should all ports not be turned on at the same time.
10.4 Migration path
NXP offers newer, more capable drop-in replacements for the PCF8574/74A in newer
space-saving packages.
PCA9670 replaces the interrupt output of the PCA9674 with a hardware reset input to
retain the maximum number of addresses. The PCA9672 replaces address A2 of the
PCA9674 with a hardware reset input to retain the interrupt, but limit the number of
addresses.
Fig 16. High current-drive load application
002aah472
VDD
P0
P1
P2
P3
P4
P5
P6
P7
VDD
SDA
SCL
INT
A0
A1
A2
CORE
PROCESSOR
VDD
LOAD
Table 6.
Migration path
Type number
I2C-bus
frequency
Voltage range
Number of
addresses
per device
Interrupt
Reset
Total package
sink current
PCF8574/74A
100 kHz
2.5 V to 6 V
8
yes
no
80 mA
PCA8574/74A
400 kHz
2.3 V to 5.5 V
8
yes
no
200 mA
PCA9674/74A
1 MHz Fm+
2.3 V to 5.5 V
64
yes
no
200 mA
PCA9670
1 MHz Fm+
2.3 V to 5.5 V
64
no
yes
200 mA
PCA9672
1 MHz Fm+
2.3 V to 5.5 V
16
yes
200 mA
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