CAP1014 datasheet(21/84 Pages) SMSC

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1014

Revision 1.65 (08-11-09)

DATASHEET

4.1

Power States

The CAP1014 has four operating states depending on the status of the SLEEP, DEACT, and DSLEEP

bits (see Section 5.1). They are described below and summarized in Table 4.1. When the device

transitions between power states, previously detected touches (for deactivated channels) are cleared

and the status bits reset.

1. Fully Active - The device is fully active. It is monitoring all active Capacitive Sensor channels and

driving all LED channels as defined.

2. Sleep - The device is in Sleep Mode. It 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 mode by

clearing the SLEEP bit. The LED11 channel is controlled via the PWR_LED control (see

Section 5.1). All other LEDs will not be affected.

3. Deep Sleep - The device is in Deep Sleep mode. It is not monitoring any Capacitive Sensor

channels or the SMBus. The LED11 channel is controlled via the PWR_LED control (see

Section 5.1). All other LEDs will have PWM controls suspended so they should be disabled prior

to entering this mode. If these LEDs are not disabled, then the system will show excess current

draw from these LEDs.

When the device leaves the Deep Sleep mode (by externally driving the ALERT pin to its active

state), then it automatically returns to its defined state and clears the DSLEEP bit. When the device

enters the Deep Sleep mode, 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).

4. Inactive - The device is inactive. It is not monitoring any Capacitive Sensor channels. The device

will still respond to SMBus commands normally and can be returned to Fully Active Mode by

clearing the DEACT bit. All LEDs will have PWM controls suspended so they should be disabled

prior to entering this mode. If these LEDs are not disabled, then the system will show excess

current draw from these LEDs.

The priority of power control signals is:

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

communications.

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

LEDs.

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

Table 4.1 Power Modes

POWER MODE

DEACT

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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