CAP1133 datasheet(15/63 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001625B-page 15

CAP1133

Deep Sleep - The device is in its lowest power state. It is not monitoring any capacitive sensor inputs and not

driving any LEDs. All LEDs will be driven to their programmed non-actuated state and no PWM operations will

be done. While in Deep Sleep, the device can be awakened by SMBus communications targeting the device.

This will not cause the DSLEEP to be cleared so the device will return to Deep Sleep once all communications

have stopped.

APPLICATION NOTE: In the Deep Sleep state, the LED output will be either high or low and will not be PWM’d at

the min or max duty cycle.

5.2

LED Drivers

The CAP1133 contains three (3) LED drivers. Each LED driver can be linked to its respective capacitive touch sensor

input or it can be controlled by the host. Each LED driver can be configured to operate in one of the following modes

with either push-pull or open drain drive.

Direct - The LED is configured to be on or off when the corresponding input stimulus is on or off (or inverted). The

brightness of the LED can be programmed from full off to full on (default). Additionally, the LED contains controls

to individually configure ramping on, off, and turn-off delay.

Pulse 1 - The LED is configured to “Pulse” (transition ON-OFF-ON) a programmable number of times with pro-

grammable rate and min / max brightness. This behavior may be actuated when a press is detected or when a

release is detected.

Pulse 2 - The LED is configured to “Pulse” while actuated and then “Pulse” a programmable number of times with

programmable rate and min / max brightness when the sensor pad is released.

Breathe - The LED is configured to transition continuously ON-OFF-ON (i.e. to “Breathe”) with a programmable

rate and min / max brightness.

When an LED is not linked to a sensor and is actuated by the host, there’s an option to assert the ALERT# pin when

the initiated LED behavior has completed.

5.2.1

LINKING LEDS TO CAPACITIVE TOUCH SENSOR INPUTS

All LEDs can be linked to the corresponding capacitive touch sensor input so that when the sensor input detects a touch,

the corresponding LED will be actuated at one of the programmed responses.

5.3

Capacitive Touch Sensing

The CAP1133 contains three (3) independent capacitive touch sensor inputs. Each sensor input has dynamic range to

detect a change of capacitance due to a touch. Additionally, each sensor input can be configured to be automatically

and routinely re-calibrated.

5.3.1

SENSING CYCLE

Each capacitive touch sensor input has controls to be activated and included in the sensing cycle. When the device is

active, it automatically initiates a sensing cycle and repeats the cycle every time it finishes. The cycle polls through each

active sensor input starting with CS1 and extending through CS3. As each capacitive touch sensor input is polled, its

measurement is compared against a baseline “Not Touched” measurement. If the delta measurement is large enough,

a touch is detected and an interrupt is generated.

The sensing cycle time is programmable (see Section 6.10, "Averaging and Sampling Configuration Register").

5.3.2

RECALIBRATING SENSOR INPUTS

There are various options for recalibrating the capacitive touch sensor inputs. Recalibration re-sets the Base Count Reg-

isters (Section 6.24, "Sensor Input Base Count Registers") which contain the “not touched” values used for touch detec-

tion comparisons.

APPLICATION NOTE: The device will recalibrate all sensor inputs that were disabled when it transitions from

Standby. Likewise, the device will recalibrate all sensor inputs when waking out of Deep

Sleep.

CAP1133 Datasheet(PDF) 15 Page - Microchip Technology

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