STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 27

• 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

STMPE821
FEATURE_SELECT
Address:
Type:
Reset:
Description:
ETC_WAIT
Address:
Type:
Reset:
Description:
7
7
[7:3] RESERVED
[2:1] AFS[1:0]:
[7:0] ETC_WAIT[7:0]:
[0] Filter EN:
6
6
0x20
R/W
0x04
Controls AFS (advanced filtering system and second level filtering feature
“00’: reserved
“01’ AFS mode 1 (only 1 strongest key)
‘10’: AFS mode 2 (all keys that are above threshold)
‘11’: AFS mode 3 (the 2 strongest keys)
Write '1' to enable filter
0x21
R/W
0x27
Sets the wait time between the calibration and the last button touch
ETC wait time = ETC_Wait[7:0] *64 + sensor clock period
A "non-touch" condition must persist for this wait time, before an ETC operation is carried out.
Range: 5 mS - 20 s
RESERVED
5
5
4
4
Doc ID 14478 Rev 5
ETC_WAIT[7:0]
3
3
2
2
Capacitive touch module registers
AFS[1:0]
1
1
Wait time setting
Feature select
Filter EN
0
0
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