CAP1026 datasheet(49/70 Pages) SMSC

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6 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

SMSC CAP1026

Revision 1.1 (08-05-09)

DATASHEET

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

‘0’ (default) - The CS6 channel not be sampled during Standby mode.

‘1’ - The CS6 channel will be sampled during Standby Mode. It will use the Standby threshold

setting, and the standby averaging and sensitivity settings.

Bit 4 - CS5_STBY - Controls whether the CS5 channel is active in Standby.

Bit 3 - CS4_STBY - Controls whether the CS4 channel is active in Standby.

Bit 2 - CS3_STBY - Controls whether the CS3 channel is active in Standby.

Bit 1 - CS2_STBY - Controls whether the CS2 channel is active in Standby.

Bit 0 - CS1_STBY - Controls whether the CS1 channel is active in Standby.

5.19

Standby Configuration Register

The Standby Configuration register controls averaging and cycle time for those sensors that are active

in Standby.

Bit 7 - AVG_SUM - Determines whether the active sensors will average the programmed number of

samples or whether they will accumulate for the programmed number of samples.

‘0’ - (default) - The active sensor delta count values will be based on the average of the

programmed number of samples when compared against the threshold.

‘1’ - The active sensor delta count values will be based on the summation of the programmed

number of samples when compared against the threshold.

Bits 5 - 3 - STBY_AVG[2:0] - Determines the number of samples that are taken for all active channels

during the sensor cycle as shown in Table 5.31. All samples are taken consecutively on the same

channel before the next channel is sampled and the result is averaged over the number of samples

measured before updating the measured results.

Table 5.29 Standby Channel Register

ADDR

R/W

DEFAULT

40h

R/W

Standby

Channel

CS6_

STBY

CS5_

STBY

CS4_

STBY

CS3_

STBY

CS2_

STBY

CS1_

STBY

00h

Table 5.30 Standby Configuration Register

ADDR

R/W

DEFAULT

41h

R/W

Standby

Configuration

AVG_

SUM

STBY_AVG[2:0]

STBY_

SAMP_

TIME

STBY_CY_TIME

[1:0]

1Dh

CAP1026 Datasheet(PDF) 49 Page - SMSC Corporation

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