CAP1126 datasheet(31/73 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001623B-page 31

CAP1126

During Power-On-Reset (POR), the default values are stored in the registers. A POR is initiated when power is first

applied to the part and the voltage on the VDD supply surpasses the POR level as specified in the electrical character-

istics. Any reads to undefined registers will return 00h. Writes to undefined registers will not have an effect.

When a bit is “set”, this means that the user writes a logic ‘1’ to it. When a bit is “cleared”, this means that the user writes

a logic ‘0’ to it.

6.1

Main Control Register

The Main Control register controls the primary power state of the device.

Bits 7 - 6 - GAIN[1:0] - Controls the gain used by the capacitive touch sensing circuitry. As the gain is increased, the

effective sensitivity is likewise increased as a smaller delta capacitance is required to generate the same delta count

values. The sensitivity settings may need to be adjusted along with the gain settings such that data overflow does not

occur.

APPLICATION NOTE: The gain settings apply to both Standby and Active states.

Bit 5 - STBY - Enables Standby.

• ‘0’ (default) - Sensor input scanning is active and LEDs are functional.

• ‘1’ - Capacitive touch sensor input scanning is limited to the sensor inputs set in the Standby Channel register (see

Section 6.20). The status registers will not be cleared until read. LEDs that are linked to capacitive touch sensor

inputs will remain linked and active. Sensor inputs that are no longer sampled will flag a release and then remain

in a non-touched state. LEDs that are manually controlled will be unaffected.

• Bit 4 - DSLEEP - Enables Deep Sleep by deactivating all functions. This bit will be cleared when the WAKE pin is

driven high. ‘0’ (default) - Sensor input scanning is active and LEDs are functional.

• ‘1’ - All sensor input scanning is disabled. All LEDs are driven to their programmed non-actuated state and no

PWM operations will be done. The status registers are automatically cleared and the INT bit is cleared.

Bit 0 - INT - Indicates that there is an interrupt. When this bit is set, it asserts the ALERT# pin. If a channel detects a

touch and its associated interrupt enable bit is not set to a logic ‘1’, no action is taken.

FDh

Product ID

Stores a fixed value that identifies

each product

53h

Page 62

FEh

Manufacturer ID

Stores a fixed value that identifies

Microchip

5Dh

Page 62

FFh

Revision

Stores a fixed value that represents

the revision number

83h

Page 62

TABLE 6-2:

MAIN CONTROL REGISTER

ADDR

R/W

B6B5

B3B2B1B0

Default

00h

R/W

Main Control

GAIN[1:0]

STBY

DSLEEP

INT

00h

TABLE 6-3:

GAIN BIT DECODE

GAIN[1:0]

Capacitive Touch Sensor Gain

TABLE 6-1:

Address

R/W

Function

Default Value

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