CAP1214 datasheet(67/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

6.30

Lid Closure Threshold Registers

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.

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.

Bits 5-4 - CS3_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 3.

Bits 3-2 - CS2_LD_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 2.

Bits 1-0 - CS1_LD_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 1.

6.30.2

Lid Closure Threshold 2 Register

The Lid Closure Threshold 2 Register controls the lid closure threshold for Capacitive Touch Sensors

5 - 8.

Bits 7-6 - CS8_LD_TH[1:0] - Controls the lid closure threshold for Capacitive Touch Sensor 8 (one of

the grouped sensors).

Table 6.43 Lid Closure Threshold Registers

ADDR

R/W

DEFAULT

3Ah

R/W

Lid Closure

Threshold 1

CS4_LD_TH

[1:0]

CS3_LD_TH

[1:0]

CS2_LD_TH

[1:0]

CS1_LD_TH

[1:0]

AAh

3Bh

R/W

Lid Closure

Threshold 2

CS8_LD_TH

[1:0]

CS7_LD_TH

[1:0]

CS6_LD_TH

[1:0]

CS5_LD_TH

[1:0]

AAh

3Ch

R/W

Lid Closure

Threshold 3

CS12_LD_TH

[1:0]

CS11_LD_TH

[1:0]

CS10_LD_TH

[1:0]

CS9_LD_TH

[1:0]

AAh

3Dh

R/W

Lid Closure

Threshold 4

CS14_LD_TH

[1:0]

CS13_LD_TH

[1:0]

0Ah

Table 6.44 CSx_LD_TH Bit Decode

CSX_LD_TH[1:0]

THRESHOLD DIVIDE SETTING

6.25%

12.5%

25% (default)

50%

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