STMPE812ABJR STMicroelectronics, STMPE812ABJR Datasheet - Page 41

• Manufacturer Part Number: STMPE812ABJR
• Description: Touch Screen Converters & Controllers Touchscreen cntrlr S-Touch
• Manufacturer: STMicroelectronics
• Type: Resistive Touch Controllersr

Specifications of STMPE812ABJR

• Rohs: yes
• Input Type: 1 TSC
• Data Rate: 400 kbps
• Resolution: 12 bit
• Interface Type: 4-wire, I2C
• Supply Voltage: 1.65 V to 3.6 V
• Supply Current: 100 uA
• Operating Temperature: - 40 C to + 85 C
• Package / Case: CSP-12
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 1.65 V

STMPE812A
12
GPIO port controller
A total of 3 configurable ports are available in the STMPE812A port expander device.
If configured as GPIO input/output, they are controlled by the GPIO registers.
Table 14.
All GPIO registers are named as GPxx, where:
Xxx represents the functional group
The function of each bit is shown in
Table 15.
If both GPFE and GPRE are not set, state transition on a GPIO does not cause an interrupt.
On power-up reset, all GPIO are set as input.
GPIO monitor pin state
GPIO set pin state
GPIO clear pin state
GPIO falling edge detection
enable
GPIO rising edge detection
enable
GPxx
Bit
Register name
Address
0x10
0x11
0x12
0x13
0x14
GPIO registers
GPIO registers
7
6
GPIO_SET_PIN
GPIO_CLR_PIN
GPIO_MP_STA
GPIO_DIR
GPIO_ED
Reading this bit yields the current state of the bit. Writing has no effect.
Writing ‘1’ to this bit causes the corresponding GPIO to go to ‘1’ state.
Writing ‘0’ to this bit has no effect
Reading this register always yield 0x00
Writing ‘1’ to this bit causes the corresponding GPIO to go to ‘0’ state.
Writing ‘0’ to this bit has no effect
Reading this register always yield 0x00
Writing ‘1’ to this bit allows interrupt generation when there is a falling
edge at the corresponding GPIO
Writing ‘0’ disables the interrupt generation on falling edge detection
Writing ‘1’ to this bit allows interrupt generation when there is a rising
edge at the corresponding GPIO
Writing ‘0’ disables the interrupt generation on rising edge detection
Register
Doc ID 18225 Rev 4
5
Table
15:
4
Bit
8
8
8
8
8
IO-2
Function
3
Type
R/W
R/W
R/W
R/W
R/W
RESERVED
Reset
0x00
0x00
0x00
0x00
0x00
2
GPIO port controller
Set pin state
Clear pin state
Monitor pin state
Falling edge
detection enable
Rising edge
detection enable
IO-1
1
Function
IO-0
0
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