参数资料
型号: MCP23S09T-E/MG
元件分类: 微控制器/微处理器
英文描述: 8 I/O, PIA-GENERAL PURPOSE, PQCC16
封装: 3 X 3 MM, 0.90 MM HEIGHT, PLASTIC, QFN-16
文件页数: 15/50页
文件大小: 607K
代理商: MCP23S09T-E/MG
MCP23009/MCP23S09
DS22121B-page 22
2009 Microchip Technology Inc.
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 1-7:
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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