CRTOUCH Datasheet, PDF (33/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

Memory Map and Registers Description
Table 12. Capacitive Touch Configuration registers map
Name
Capacitive System
Configuration
DC Tracker Rate
Capacitive Touch
ResponseTime
StuckKeyTimeout
Electrode0 Sensitivity
Electrode1 Sensitivity
Electrode2 Sensitivity
Electrode3 Sensitivity
Electrodes Enablers
Register
address
0x60
Incremental
Address
0x61
Default
Value
0x20
0x61
0x62
0x0A
0x62
0x63
0x04
0x63
0x64
0x64
0x65
0x64
0x40
0x65
0x66
0x40
0x66
0x67
0x40
0x67
0x68
0x40
0x68
0x69
0x0F
Capacitive touch Low power 0x69
scan period
Capacitive Touch Low power 0x6A
electrode
Low power electrode
sensitivity
Capacitive Resolution
0x6B
0x6C
0x6A
0x6B
0x6C
0x6D
0x0F
0x00
0x7F
0x0A
Valid
Range
Comment
—
0x00 –
0xFF
0x00 –
0x20
0x00 —
0xFF
0x02 –
0x7F
0x02 –
0x7F
0x02 –
0x7F
0x02 –
0x7F
—
0x00 –
0x0F
0x00 –
0x03
0x00 –
0x7F
0x08 –
0x0B
Main configuration of the capacitive
touch system
Determines how often the
recalibration function occurs.
Configures the number of scans
necessary to determine if a key is
pressed
Configures the number of scans to
detect a key stuck
Represents the capacitance threshold
for electrode 0 to be detected as
touched
Represents the capacitance threshold
for electrode 1 to be detected as
touched
Represents the capacitance threshold
for electrode 2 to be detected as
touched
Represents the capacitance threshold
for electrode 3 to be detected as
touched
Each bit represents the enabler of an
electrode. If a bit is 0, then the
corresponding electrode will not be
scanned
Represents the value of the scan
period in low power mode
This register represents the number of
the electrode scanned in low power
mode
Threshold for the low power electrode
while in shutdown mode
Determines the resolution in bits of the
capacitive samples
CRTouch Data Sheet, Rev. 3
Freescale Semiconductor
33