参数资料
型号: MCP23018-E/SO
厂商: Microchip Technology
文件页数: 18/56页
文件大小: 0K
描述: IC I/O EXPANDER I2C 16B 28SOIC
标准包装: 27
接口: I²C
输入/输出数: 16
中断输出:
频率 - 时钟: 3.4MHz
电源电压: 1.8 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
供应商设备封装: 28-SOIC
包装: 管件
产品目录页面: 684 (CN2011-ZH PDF)
2008 Microchip Technology Inc.
DS22103A-page 25
MCP23018/MCP23S18
1.6.7
PULL-UP RESISTOR
CONFIGURATION REGISTER
The GPPU register controls the pull-up resistors for the
port pins. If a bit is set the corresponding port pin is
internally pulled up with an internal resistor.
FIGURE 1-10:
TYPICAL PERFORMANCE CURVE FOR THE INTERNAL PULL-UP RESISTORS
REGISTER 1-9:
GPPU – GPIO PULL-UP RESISTOR REGISTER
R/W-0
PU7
PU6
PU5
PU4
PU3
PU2
PU1
PU0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-0
PU7:PU0: Controls the internal pull-up resistors on each pin (when configured as an input or output)
<7:0>.
1
= Pull-up enabled.
0
= Pull-up disabled.
GPIO Pin Internal Pull-up Current vs VDD
0
50
100
150
200
250
300
350
400
1.52
2.533.5
4
4.5
55.5
VDD (V)
IPU
(
A
)
T = -40°C
T = +25°C
T = +125°C
T = +85°C
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