STEVAL-ILL029V2 STMicroelectronics, STEVAL-ILL029V2 Datasheet - Page 66

• Manufacturer Part Number: STEVAL-ILL029V2
• Description: BOARD & REF DESIGN
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of STEVAL-ILL029V2

• Main Purpose: Touch Interface, LED Driver
• Embedded: Yes, MCU, 32-Bit
• Utilized Ic / Part: STLED325, STM8S, STMPE24M31
• Primary Attributes: 4 Digit 7-Segment LEDs, 8 Discrete LEDs, 8 Touch Pads, 8-Channel Touch Wheel
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Touchkey controller
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Touchkey controller
The touchkey controller processes raw capacitance measurement data into “touch/no-
touch” boolean data for easy usage. The 2 key filter units provides additional flexibility by
allowing the system to define a maximum number of keys that could be detected and
considered active, based on the amount of impedance change detected.
Table 16.
Figure 19. Data flow in touchkey controller
Address
0x9A
0xB4
0x90
0x92
0x96
Touchkey controller registers
KEY_FILT_GROUP1
KEY_FILT_GROUP2
KEY_FILT_CTRL
KEY_FILT_DATA
Register name
TOUCH_DET
Doc ID 16174 Rev 3
Reset value
0x00000000
0x00000000
0x00000000
0x00000000
0x00
R/W
R/W
R/W
R/W
R
R
General key filter control
Define channels included in key
filter group 1
Define channels included in key
filter group 2
Filtered touchkey data
Touch detection register
(real time)
STMPE16M31, STMPE24M31
Description