STMPE1801BJR STMicroelectronics, STMPE1801BJR Datasheet - Page 52

• 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

Keypad controller
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Keypad wakeup from Hibernate mode
The keypad controller is functional in Hibernate mode as long as it is enabled before
entering the Hibernate mode. It will then wake the system up into operational mode if a valid
key press is detected.
An asynchronous detection of the keypad column input activity is turned on during the
Hibernate mode. If any key activity is detected, the system wakes up into operational mode
for the de-bouncing of the key press to take place. If a valid key is detected, the system
stays in operational mode; otherwise, the device goes back into Hibernate mode.
Keypad controller combination key interrupt
The keypad controller (KPC) can be programmed to exit from Hibernate mode if a unique
combination keys is detected. These combination keys of up to 3 keys are specified in the
KPC combination set 0-2 registers.
There are 2 combination key operation modes. The modes can be set in the
COMB_KEY_MODE in the KPC_CTRL_HIGH register. In ‘OR’ mode, the device exits from
Hibernate mode on ANY of the 3 keys specified in the KPC combination set 0-2 registers. In
‘AND’ mode, the device exits from Hibernate mode ONLY if ALL of the 3 keys are pressed.
The sequence of the key pressed in not relevant as long as the 1-3 keys specified in the
KPC_COMB_KEY registers are detected, the KPC will exit from Hibernate mode and
interrupt the host. All the "active" keys must be pressed and held together, for the combi-key
interrupt to be generated.
If any other keys (beside those specified in the KPC_COMB_KEY_N registers) are pressed,
it would be considered an invalid combination and no interrupt will be generated.
Doc ID 17884 Rev 3
STMPE1801