STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 34
![IC CTLR TOUCH KEY 8CH CAP 16-QFN](/photos/6/64/66486/stmpe821qtr_sml.jpg)
STMPE821QTR
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STMPE821QTR
Manufacturer:
STM
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Capacitive touch module registers
FILTER_THRESHOLD
Address:
Type:
Reset:
Description:
REFERENCE_DELAY
Address:
Type:
Reset:
Description:
34/55
RESERVED
7
7
[7:0] FILTER_THRESHOLD:
[6:0] REFERENCE_DELAY:
[7] RESERVED
6
6
0x29
R/W
0x00
Filter threshold.
An internal "Filter Counter" is compared with Filter Threshold [7:0] to determine if a valid touch
has occurred.
0x2A
R/W
0x00
Shifting of capacitive sensor dynamic range. The capacitance value set into this
register is in effect, equivalent to capacitor connected to the A_Ref pin.
Valid range = 0-127
Each step represents capacitance value of 0.05 pF
Warm reset is required after this value is updated
5
5
4
4
Filter threshold
Reference delay
FILTER_THRESHOLD
3
3
REFERENCE_DELAY
2
2
1
1
STMPE821
0
0