CAP1028 datasheet(49/71 Pages) SMSC

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8 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

SMSC CAP1028

Revision 1.1 (08-05-09)

DATASHEET

5.17.1

Sensor Noise Threshold 1 Register

The Sensor Noise Threshold 1 register controls the noise threshold for Capacitive Touch Sensors 1-4.

Bits 7-6 - CS4_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 4.

Bits 5-4 - CS3_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 3.

Bits 3-2 - CS2_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 2.

Bits 1-0 - CS1_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 1.

5.17.2

Sensor Noise Threshold 2 Register

The Sensor Noise Threshold 2 register controls the noise threshold for Capacitive Touch Sensors 5 - 8.

Bits 7-6 - CS8_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 8.

Bits 5-4 - CS7_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 7.

Bits 3-2 - CS6_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 6.

Bits 1-0 - CS5_BN_TH[1:0] - Controls the noise threshold for Capacitive Touch Sensor 5.

5.18

Standby Channel Register

The Standby Channel register controls which (if any) Capacitive Touch Sensors are active during

Standby.

Bit 7 - CS8_STBY - Controls whether the CS8 channel is active in Standby.

‘0’ (default) - The CS8 channel not be sampled during Standby.

‘1’ - The CS8 channel will be sampled during Standby. It will use the Standby threshold setting, and

the standby averaging and sensitivity settings.

Bit 6 - CS7_STBY - Controls whether the CS7 channel is active in Standby.

Bit 5 - CS6_STBY - Controls whether the CS6 channel is active in Standby.

Table 5.28 CSx_BN_TH Bit Decode

CSX_BN_TH[1:0]

THRESHOLD DIVIDE SETTING

25%

37.5% (default)

50%

62.5%

Table 5.29 Standby Channel Register

ADDR

R/W

DEFAULT

40h

R/W

Standby

Channel

CS8_

STBY

CS7_

STBY

CS6_

STBY

CS5_

STBY

CS4_

STBY

CS3_

STBY

CS2_

STBY

CS1_

STBY

00h

CAP1028 Datasheet(PDF) 49 Page - SMSC Corporation

CAP1028 Datasheet(HTML) 49 Page - SMSC Corporation

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