STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 32

• 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

Capacitive touch module registers
TVR
Address:
Type:
Reset:
Description:
EVR
Address:
Type:
Reset:
Description:
STRENGTH_THRESHOLD
Address:
Type:
Reset:
Description:
32/50
RESERVED
RESERVED
7
7
7
[6:0] TVR:
[7:0] STRENGTH_THRESHOLD:
[7] RESERVED
[7] RESERVED
[6] EVR:
6
6
6
0X30 - 0x3B
R/W
0x08
Touch variance setting.
Setting TVR between 0-99
A high TVR value decreases sensitivity of the sensor, but increasing 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 - 0x57
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 14478 Rev 5
3
3
3
TVR
TVR
2
2
2
Environmental variance
Touch variance setting
1
1
1
Strength threshold
STMPE821
0
0
0