STMPE321QTR STMicroelectronics, STMPE321QTR Datasheet - Page 30

• 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

Capacitive touch module registers
TVR
Address:
Type:
Reset:
Description:
EVR
Address:
Type:
Reset:
Description:
STRENGTH_THRESHOLD
Address:
Type:
Reset:
Description:
30/40
RESERVED
RESERVED
7
7
7
[6:0] TVR:
[7:0] STRENGTH_THRESHOLD:
[7] RESERVED
[7] RESERVED
[6] EVR:
6
6
6
0x30 - 0x32
R/W
0x08
Touch variance setting
Setting TVR between 0-99
A high TVR value decreases sensitivity of the sensor, but increases its tolerance to ambient
noise
A small TVR value increases the sensitivity
0x40
R/W
0x04
Environmental variance setting.
EVR is used to detect "Non-Touch" condition
0x50 - 0x52
R/W
0x01
Strength threshold.
Setting threshold to be used in AFS mode to determine valid touch
5
5
5
4
4
4
STRENGTH_THRESHOLD
Doc ID 15791 Rev 3
3
3
3
TVR
TVR
2
2
2
Environmental variance
Touch variance setting
1
1
1
Strength threshold
STMPE321
0
0
0