8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Chapter 5 Register Description
The registers shown in Table 5.1 are accessible through the communications protocol. An entry of ‘-’
indicates that the bit is not used and will always read ‘0’.
Table 5.1 Register Set in Hexadecimal Order
DEFAULT
REGISTER
ADDRESS
R/W
REGISTER NAME
FUNCTION
VALUE
PAGE
Controls general power states and
power dissipation
00h
02h
03h
04h
0Ah
R/W
R
Main Control
General Status
Sensor Input Status
LED Status
00h
00h
00h
00h
00h
Page 41
Page 42
Page 42
Page 42
Page 43
Stores general status bits
Returns the state of the sampled
capacitive touch sensor inputs
R
R
Stores status bits for LEDs
Stores the noise flags for sensor
inputs
R
Noise Flag Status
Sensor Input 1 Delta
Count
10h
11h
12h
13h
14h
15h
16h
17h
R
R
R
R
R
R
R
R
Stores the delta count for CS1
Stores the delta count for CS2
Stores the delta count for CS3
Stores the delta count for CS4
Stores the delta count for CS5
Stores the delta count for CS6
Stores the delta count for CS7
Stores the delta count for CS8
00h
00h
00h
00h
00h
00h
00h
00h
Page 44
Page 44
Page 44
Page 44
Page 44
Page 44
Page 44
Page 44
Sensor Input 2 Delta
Count
Sensor Input 3 Delta
Count
Sensor Input 4 Delta
Count
Sensor Input 5 Delta
Count
Sensor Input 6 Delta
Count
Sensor Input 7 Delta
Count
Sensor Input 8 Delta
Count
Controls the sensitivity of the
threshold and delta counts and data
scaling of the base counts
1Fh
R/W
Sensitivity Control
2Fh
Page 45
20h
21h
R/W
R/W
Configuration
Controls general functionality
20h
FFh
Page 46
Page 48
Controls whether the capacitive
touch sensor inputs are sampled
Sensor Input Enable
Controls max duration and auto-
repeat delay for sensor inputs
operating in the full power state
Sensor Input
Configuration
22h
R/W
R/W
A4h
07h
Page 49
Page 50
Sensor Input
Configuration 2
Controls the MPRESS controls for all
sensor inputs
23h
SMSC CAP1128
Revision 1.32 (01-05-12)
DATA3S7HEET
SMSC [ SMSC CORPORATION ]
