CAP1214 datasheet(24/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

1. Fully Active - The device is monitoring all active Capacitive Sensor channels and driving all LED

channels as defined.

2. Sleep - The device is monitoring a limited number of Capacitive Sensor channels (default 0).

Interrupts will still be generated based on the active channels. The device will still respond to

SMBus commands normally and can be returned to the Fully Active state by clearing the SLEEP

bit. The LED11 channel is controlled via the PWR_LED control (see Section 6.1). All other LEDs

will not be affected.

3. Deep Sleep - The device is not monitoring any Capacitive Sensor channels. The LED11 channel

is controlled via the PWR_LED control (see Section 6.1). All other LEDs will be driven to their

programmed non-actuated state and no PWM operations will be done.

When the device enters the Deep Sleep state, it will release control to the ALERT pin and will

change the direction of the ALERT pin (i.e. the device will monitor the ALERT pin instead of driving

it).

APPLICATION NOTE: When the device enters the Deep Sleep state, the Slider Position / Volumetric Data Register

(06h) is cleared, if the register is set to represent position data.

The device has two methods to exit the Deep Sleep state. They are:

a. The ALERT pin is driven to its active state.

b. Any SMBus communications are directed at the device.

When the device leaves the Deep Sleep state, it automatically returns to its previously defined state

and clears the DSLEEP bit.

4. Inactive - The device is not monitoring any Capacitive Sensor channels. The device will still

respond to SMBus commands normally and can be returned to Fully Active state by clearing the

DEACT bit. All LEDs will have PWM controls suspended so they should be disabled prior to

entering this state. If these LEDs are not disabled, the system will show excess current draw from

these LEDs.

The priority of power control signals is:

1. DSLEEP - when set, will override DEACT and disable all LEDs except LED11.

2. DEACT - when set, will override the SLEEP controls. It will disable sensor measurement and all

LEDs.

3. SLEEP - when set, will enable Sleep state.

Table 5.1 Power States

POWER STATE

INACTIVE

SLEEP

DSLEEP

Fully Active

Deep Sleep waking to Fully Active

Sleep

010

Deep Sleep waking to Sleep

Inactive

100

Deep Sleep waking to Inactive

Inactive

110

Deep Sleep waking to Inactive

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