STMPE1801BJR STMicroelectronics, STMPE1801BJR Datasheet - Page 34

• Manufacturer Part Number: STMPE1801BJR
• Description: Touch Screen Converters & Controllers Xpander Logic 18-Bit 18 GPIO 1.65 to 3.6V
• Manufacturer: STMicroelectronics

Specifications of STMPE1801BJR

• Rohs: yes
• Input Type: 1 Keypad
• Data Rate: 400 kbps
• Resolution: 18 bit
• Interface Type: I2C
• Supply Voltage: 1.65 V to 3.6 V
• Supply Current: 28 uA
• Operating Temperature: - 40 C to + 85 C
• Package / Case: CSP-25
• 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

GPIO controller
10.2
10.2.1
10.2.2
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Hotkey feature
A GPIO is known as ‘Hotkey’ when it is configured to trigger an interruption to the host
whenever the GPIO input is being asserted. This feature is applicable in operational mode
as well as in Hibernate mode.
Programming sequence for Hotkey
1.
2.
3.
4.
5.
Below are the conditions to be fulfilled in order to configure a Hot Key:
1.
2.
3.
Minimum pulse width
The minimum pulse width of the assertion of the Hotkey is dependent on the de-bounce
time configured. It must be greater than the de-bounce value configured. Any pulse width
less than the stated value may not be registered.
Configure the GPIO pin into input direction by setting the corresponding bit in the GPIO
set pin direction registers [GPIO_SET_DIR_yyy].
Set the GPIO rising edge registers [GPIO_RE_yyy] and GPIO falling edge registers
[GPIO_FE_yyy] to the desired values to enable the rising edge or falling edge
detection.
Configure and enable the interrupt controller to allow the interruption to the host.
Now, the GPIO expander may enter Hibernate mode if there is no activity.
Upon any hot-key being asserted, the device will wake up and issue an interrupt to the
host.
The pin is configured into GPIO mode and as input pin.
The global interrupt mask bit is enabled.
The corresponding GPIO interrupt mask bit is enabled.
Doc ID 17884 Rev 3
STMPE1801