STMPE321QTR STMicroelectronics, STMPE321QTR Datasheet - Page 24

• 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
8
TOUCH_FIFO
Address:
Type:
Reset:
Description:
24/40
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 byte 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 the STMPE321,
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
Doc ID 15791 Rev 3
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
Touch FIFO
STMPE321
T0
0