參數(shù)資料
型號： MCP23S18-E/SO
元件分類： 微控制器/微處理器
英文描述： PIA-GENERAL PURPOSE, PDSO28
封裝： 0.300 INCH, PLASTIC, SOIC-28
文件頁數(shù)： 18/56頁
文件大?。?/td> 738K
代理商： MCP23S18-E/SO
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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