STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 24

• Manufacturer Part Number: STMPE821QTR
• Description: IC CTLR TOUCH KEY 8CH CAP 16-QFN
• Manufacturer: STMicroelectronics
• Type: Capacitiver

Specifications of STMPE821QTR

• Number Of Inputs/keys: 8 Key
• Data Interface: I²C
• Voltage - Supply: 1.65 V ~ 1.95 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• Voltage Supply Source: Single Supply
• Resolution: 7 bit to 10 bit
• Interface Type: I2C
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Number Of Channels: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sampling Rate (per Second): -
• Resolution (bits): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-8826-2

GPIO controller
7
24/50
IO-7
7
7
GPIO controller
A total of 8 GPIOs are available in the STMPE821. The GPIO controller contains the
registers that allow the host system to configure each of the pins into either a GPIO, direct
output of a TOUCH channel or a PWM output. Unused GPIOs should be configured as
outputs to minimize the power consumption.
A group of registers is used to control the exact function of each of the 8 GPIOs. The
registers and their respective address is listed in the following table.
Table 8.
All GPIO registers are named as GPxx, where:
Xxx represents the functional group
For LSB registers:
For MSB registers:
IO-6
6
6
Address
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
GPIO controller registers summary map
IO-5
5
5
IO-4
GPIO_FUNCT_MSB
GPIO_FUNCT_LSB
4
4
GPIO_SET_MSB
GPIO_SET_LSB
GPIO_DIR_MSB
GPIO_MR_MSB
GPIO_DIR_LSB
GPIO_MR_LSB
Register name
Doc ID 14478 Rev 5
RESERVED
IO-3
3
3
GPIO monitor pin state
register
GPIO set pin state
register
GPIO set pin direction
register
GPIO function register
IO-2
2
2
Description
IO-1
1
1
Auto-increment
YES
YES
YES
YES
STMPE821
IO-0
0
0