CAP1028 datasheet(39/71 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

5.6

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 - WAKE_CFG - Configures the operation of the WAKE pin.

‘0’ (default) - The WAKE pin is not asserted when a touch is detected while the device is in Standby.

It will still be used to wake the device from Deep Sleep when driven high.

‘1’ - The WAKE pin will be asserted high when a touch is detected while the device is in Standby.

It will also be used to wake the device from Deep Sleep when driven high.

Bit 5 - BLK_DIG_NOISE - Determines whether the digital noise threshold is used by the device.

‘0’ - The digital noise threshold is used. If a delta count value exceeds the noise threshold but does

not exceed the touch threshold, then the sample is discarded and not used for the automatic re-

calibration routine.

Table 5.8 BASE_SHIFT Bit Decode

BASE_SHIFT[3:0]

DATA SCALING

FACTOR

16x

32x

64x

128x

256x

All others

256x

(default = 1111b)

Table 5.9 Configuration Register

ADDR

R/W

DEFAULT

20h

R/W

Configuration

TIMEOUT

WAKE_

CFG

BLK_ DIG_

NOISE

BLK_ ANA_

NOISE

MAX_DUR_

20h

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