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STMPE811 Datasheet(PDF) 48 Page - STMicroelectronics

Part # STMPE811
Description  8-bit port expander with advanced touchscreen controller
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE811 Datasheet(HTML) 48 Page - STMicroelectronics

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GPIO controller
STMPE811
48/54
GPIO_FE
Falling edge
Address:
0x16
Type:
R/W
Reset:
0x00
Description:
Falling edge has been detected.
GPIO_ALT_FUNCT
Alternate function register
Address:
0x17
Type:
R/W
Reset:
0x0F
Description:
Alternate function register. "‘0’ sets the corresponding GPIO to function as GPIO, and
‘1’ sets it to Touch Key Direct Output mode.
On power-up reset, all GPIOs are set as input.
Power supply
The STMPE811 GPIO operates from a separate supply pin (VIO). This dedicated supply pin
provides a level-shifting feature to the STMPE811. The GPIO remains valid until VIO is
removed.
The host system may choose to turn off Vcc supply while keeping VIO supplied. However it is
not allowed to turn off supply to VIO, while keeping the Vcc supplied.
The touchscreen is always powered by VIO. For better resolution and noise immunity, VIO
above 2.8 V is advised.
13.0.1
Power-up reset (POR)
The STMPE811 is equipped with an internal POR circuit that holds the device in reset state,
until the VIO supply input is valid. The internal POR is tied to the VIO supply pin.


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