STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 18

• 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

System and identification registers
SYS_CFG_2
Address:
Type:
Reset:
Description:
18/50
CLOCK 2
SENSOR
7
Table 7.
CLOCK 1
SENSOR
Operational
(6.5 MHz)
Autosleep
(200 KHz)
[7:5] SENSOR CLOCK: See description in the table below.
[4] RESERVED
[3] PWM CLOCK DISABLE:
[2] GPIO CLOCK DISABLE:
[1] FIFO CLOCK DISABLE:
[0] TOUCH CLOCK DISABLE:
6
0x04
R/W
0xEF
This register enables to switch off the clock supply
Write ‘1’ to disable the clock to PWM unit.
Write ‘1’ to disable the clock to GPIO unit. Note that GPIO clock is required for PWM operation.
Write ‘1’ to disable the clock to FIFO unit. This must be set to ‘0’ if touch interrupt is required.
Write ‘1’ to disable the clock to TOUCH unit.
Mode
CLOCK 0
SENSOR
Sensor clock setting
5
Divider
4
-
16
16
1
2
4
8
1
2
4
8
Doc ID 14478 Rev 5
PWM CLOCK
DISABLE
3
Sensor clock
[2:0]
000
001
010
011
000
001
010
011
1xx
1xx
GPIO CLOCK
DISABLE
2
12.8 KHz
6.4 KHz
3.2 KHz
1.6 KHz
800 Hz
400 Hz
200 Hz
100 Hz
Active
50 Hz
25 Hz
System configuration 2
FIFO CLOCK
DISABLE
1
Calibration
TOUCH CLOCK
12.5 KHz
6.25 KHz
100 KHz
3.2 KHz
1.6 KHz
50 KHz
25 KHz
800 Hz
400 Hz
200 Hz
STMPE821
DISABLE
0