STMPE321QTR STMicroelectronics, STMPE321QTR Datasheet - Page 32

• 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
CALIBRATED_IMPEDANCE
Address:
Type:
Reset:
Description:
IMPEDANCE
Address:
Type:
Reset:
Description:
TINT_PENDING
Address:
Type:
Reset:
Description:
32/40
7
7
7
[7:0] CALIBRATED IMPEDANCE:
[7:0] IMPEDANCE:
[7:4] RESERVED
[2:0] RESERVED
[3] EOC:
6
6
6
0x70 - 0x72
R
0x00
Calibrated impedance is a reference value maintained by the device.
Calibrated reference impedance
0x80 - 0x82
R
0x00
Impedance is the instantaneous impedance value seen at the input pin of each
capacitive sensing pin.
Currently sensed impedance. This impedance reading decreases with the increase of the
capacitance at the sensing channel.
When this register reads 0x7F, reference capacitance should be reduced.
When this register reads 0x00, reference capacitance should be increased.
0x92
R
0x00
Reflects the status of each interrupt source.
End of calibration
RESERVED
5
5
5
Doc ID 15791 Rev 3
4
4
4
CAL_IMPEDANCE
IMPEDANCE
EOC
3
3
3
2
2
2
Calibrated impedance
RESERVED
Interrupt pending
1
1
1
Impedance
STMPE321
0
0
0