MCP23009ESS datasheet(22/50 Pages) MICROCHIP

22 / 50 page

MCP23009/MCP23S09

DS22121B-page 22

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

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>.

= Pull-up enabled

= Pull-up disabled

GPIO Pin Internal Pull-up Current vs VDD

100

150

200

250

300

350

400

1.52

2.533.5

4.5

55.5

VDD (V)

T = -40°C

T = +25°C

T = +125°C

T = +85°C

MCP23009ESS 数据表(PDF) 22 Page - Microchip Technology

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