CAP1114 Datasheet, PDF (66/102 Pages) SMSC Corporation – Multiple Channel Capacitive Touch Sensor and LED Driver

Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
6.29.2 Button Noise Threshold 2 Register
The Button Noise Threshold 2 Register controls the noise threshold for Capacitive Touch Sensors 5 -
7 and the Grouped sensors.
Bits 7-6 - GR_BN_TH[1:0] - Controls the noise threshold for all grouped Capacitive Touch Sensors.
Bits 5-4 - CH7_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 7.
Bits 3-2 - CH6_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 6.
Bits 1-0 - CH5_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 5.
6.30 Lid Closure Threshold Registers
ADDR R/W
3Ah
R/W
3Bh
R/W
3Ch
R/W
3Dh
R/W
REGISTER
Lid Closure
Threshold 1
Lid Closure
Threshold 2
Lid Closure
Threshold 3
Lid Closure
Threshold 4
Table 6.43 Lid Closure Threshold Registers
B7
B6
CS4_LD_TH
[1:0]
CS8_LD_TH
[1:0]
CS12_LD_TH
[1:0]
-
-
B5
B4
CS3_LD_TH
[1:0]
CS7_LD_TH
[1:0]
CS11_LD_TH
[1:0]
-
-
B3
B2
CS2_LD_TH
[1:0]
CS6_LD_TH
[1:0]
CS10_LD_TH
[1:0]
CS14_LD_TH
[1:0]
B1
B0
CS1_LD_TH
[1:0]
CS5_LD_TH
[1:0]
CS9_LD_TH
[1:0]
CS13_LD_TH
[1:0]
DEFAULT
AAh
AAh
AAh
0Ah
The Lid Closure Threshold Registers control the value of a secondary internal threshold to detect noise
potentially generated by lid closure. If a Capacitive Touch Sensor output exceeds the Lid Closure
Threshold, the appropriate status bit is set in the Lid Closure Status register (see Section 6.8).
The Lid Closure Threshold is proportional to the programmed Sensor Threshold as shown in
Table 6.44.
Table 6.44 CSx_LD_TH Bit Decode
CSX_LD_TH[1:0]
1
0
THRESHOLD DIVIDE SETTING
0
0
6.25%
0
1
12.5%
1
0
25% (default)
1
1
50%
6.30.1
Lid Closure Threshold 1 Register
The Lid Closure Threshold 1 Register controls the lid closure threshold for Capacitive Touch Sensors
1-4.
Bits 7-6 - CS4_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 4.
Revision 1.1 (02-04-11)
66
DATASHEET
SMSC CAP1114