CAP1014 datasheet(44/84 Pages) SMSC

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.65 (08-11-09)

SMSC CAP1014

DATASHEET

5.14

Configuration Register

The Configuration register controls general global functionality that affects the entire device.

Bit 7 - TIMEOUT - Enables the timeout and idle functionality of the SMBus protocol.

‘0’ (default) - The SMBus timeout and idle functionality are disabled. The SMBus interface will not

time out if the clock line is held low. Likewise, it will not reset if both the data and clock lines are

held high for longer than 150us. This is used for I2C compliance.

‘1’ - The SMBus timeout and idle functionality are enabled. The SMBus interface will time out if the

clock line is held low for longer than 30ms. Likewise, it will reset if both the data and clock lines

are held high for longer than 150us.

Bit 6 - POS_VOL - Determines the behavior of the POS[6:0] status bits when a Grouped sensor is

activated - see Section 5.4.

‘0’ (default) - The POS[6:0] bits represent position information that indicates which sensor was

touched or the last sensor touched during a slide.

‘1’ - The POS[6:0] bits represent volumetric data. The Position / Volumetric Data register is read /

write.

Bit 5 - BLK_DIG_NOISE - Determines whether the noise threshold is checked when determining

whether to discard samples.

‘0’ - The noise threshold is enabled and checked. If a sample is above the noise threshold, it is not

included in the re-calibration routine.

‘1’ (default) - The noise threshold is disabled. No samples are excluded from the re-calibration

routine.

Bit 4 - BLK_ANA_NOISE - Determines whether the noise flag setting will block a touch detection as

well as the analog calibration routine.

‘0’ (default) - If the analog noise bit is set, then a touch is blocked on the corresponding channel

and will force the analog calibration routine to retry.

‘1’ - A touch is not blocked even if the analog noise bit is set. Likewise, the analog calibration

routine will not retry if the analog noise bit is set.

Bit 3 - MAX_DUR_EN_B - Determines whether the maximum duration recalibration is enabled for non-

grouped sensors.

256x

All others

256x

(default = 1111b)

Table 5.20 Configuration Register

ADDR

R/W

DEFAULT

20h

R/W

Configuration

TIME

OUT

POS_

VOL

BLK

NOISE_

BLK_

NOISE_

DIS

MAX_

DUR_

EN_B

RPT_

EN_B

MAX_

DUR_

EN_G

RPT_

EN_G

2Dh

Table 5.19 C_DSP Bit Decode (continued)

C_DSP[3:0]

DATA SCALING

FACTOR

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