STMPE321QTR STMicroelectronics, STMPE321QTR Datasheet - Page 25

• 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

STMPE321
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 15791 Rev 3
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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