CAP1296 datasheet(26/68 Pages) MICROCHIP

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CAP1296

DS00001569B-page 26

 2013-2015 Microchip Technology Inc.

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.

When a bit is “set”, this means it’s at a logic ‘1’. When a bit is “cleared”, this means it’s at a logic ‘0’.

5.1

Main Control Register

The Main Control register controls the primary power state of the device (see Section 4.1, "Power States").

If more than one power state bit is set, the actual power state will be as shown in Table 5-3, "Power State Bit Overrides".

Bits 7 - 6 - GAIN[1:0] - Controls the analog 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[1:0] settings apply to both Standby and Active states, unless the COMBO bit is

set. When the COMBO bit is set, this control only applies to the sensors enabled in the

Active state, and the C_GAIN[1:0] control applies to the sensors enabled in the Standby

state.

APPLICATION NOTE: Whenever the gain settings change, the device will recalibrate all sensor inputs as if they

had no base count.

FDh

Product ID

Stores a fixed value that identifies

the CAP1296-1

69h

Page 52

FEh

Manufacturer ID

Stores a fixed value that identifies

MCHP

5Dh

Page 52

FFh

Revision

Stores a fixed value that represents

the revision number

00h

Page 52

TABLE 5-2:

MAIN CONTROL REGISTER

Addr

R/W

Default

00h

R/W

Main Control

GAIN[1:0]

STBY

DSLEEP

C_GAIN[1:0]

COMBO

INT

00h

TABLE 5-3:

POWER STATE BIT OVERRIDES

DSLEEP

COMBO

STBY

Power State

000

Active

Standby

Combo

DSleep

TABLE 5-1:

Address

R/W

Function

Default

Value

Page

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