STMPE321QTR STMicroelectronics, STMPE321QTR Datasheet - Page 22

• Manufacturer Part Number: STMPE321QTR
• Description: IC CTLR TOUCH KEY 3CH 12-QFN
• Manufacturer: STMicroelectronics
• Series: S-Touch™r
• Type: Capacitiver

Specifications of STMPE321QTR

• Number Of Inputs/keys: 3 Key
• Resolution (bits): 8 b
• Data Interface: I²C
• Data Rate/sampling Rate (sps, Bps): 100k
• Voltage - Supply: 1.65 V ~ 1.95 V
• Mounting Type: Surface Mount
• Package / Case: 12-QFN
• Voltage Supply Source: Single Supply
• Resolution: 7 bit to 10 bit
• Interface Type: I2C
• Supply Voltage (max): 1.95 V
• Supply Voltage (min): 1.65 V
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Sampling Rate (per Second): -
• Lead Free Status / Rohs Status: Details
• Other names: 497-8985-2

GPIO controller
7
22/40
7
7
GPIO controller
A total of 3 GPIOs are available in the STMPE321. The GPIO controller contains the
registers that allow the host system to configure each of the pins into either a GPIO or Touch
input. Unused GPIOs should be configured as outputs to minimize power consumption.
A group of registers is used to control the exact function of each of the 3 GPIOs. The
registers and their respective addresses are listed in
Table 8.
All GPIO registers are named GPxx, where:
Xxx represents the functional group
For LSB registers:
For MSB registers:
6
6
Address
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
RESERVED
GPIO controller registers summary map
5
5
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 15791 Rev 3
RESERVED
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
Table 8.
IO-1
1
1
Auto-increment
Yes
Yes
Yes
Yes
STMPE321
IO-0
0
0