CAP1088 datasheet(39/72 Pages) SMSC

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8 Channel Capacitive Touch Sensor with 8 LED Drivers

Datasheet

SMSC CAP1088

Revision 1.1 (08-05-09)

DATASHEET

Bits 3 - 0 - BASE_SHIFT[3:0] - Controls the scaling and data presentation of the Base Count registers.

The higher the value of these bits, the larger the range and the lower the resolution of the data

presented. The scale factor represents the multiplier to the bit-weighting presented in these register

descriptions.

APPLICATION NOTE: The BASE_SHIFT[3:0] bits normally do not need to be updated. These settings will not affect

touch detection or sensitivity. These bits are sometimes helpful in analyzing the Cap Sensing

board performance and stability.

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.

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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