STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 26
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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
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Part Number
Manufacturer
Quantity
Price
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Part Number:
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Capacitive touch module registers
8
TOUCH_FIFO
Address:
Type:
Reset:
Description:
26/55
T7
7
Capacitive touch module registers
Table 10.
T6
6
0x19, 0x18
R
0x00
TOUCH_FIFO is the access port for the internal 4-level FIFO used for buffering the
touch events. While it is possible to access each bytes in the data structure directly, it
is recommended that the FIFO is accessed only via the 0x18 address.
The FIFO must be accessed in multiples of 2 bytes (LSB, MSB). For STMPE821,
MSB is reserved and LSB contains a snapshot of the recent touch event. The FIFO
must be accessed in multiples of 2 bytes (LSB, MSB). For STMPE821, MSB is
reserved and LSB contains a snapshot of the recent touch event.
Where Tn is touch status of touch sensing channel n.
TOUCH_FIFO summary table
T5
5
Address
0x1C
0x1D
0x1A
0x1B
0x1E
0x1F
0x18
0x19
T4
4
Touch FIFO
T3
3
T2
2
FIFO-0, MSB
FIFO-1, MSB
FIFO-2, MSB
FIFO-3, MSB
FIFO-0, LSB
FIFO-1, LSB
FIFO-2, LSB
FIFO-3, LSB
Function
T1
1
STMPE821
T0
0