CAP1133 datasheet(21/63 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001625B-page 21

CAP1133

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.

91h

R/W

LED Pulse 2 Duty Cycle

Determines the min and max duty

cycle for breathe and pulse operation

F0h

Page 47

92h

R/W

LED Breathe Duty Cycle

Determines the min and max duty

cycle for the breathe operation

F0h

Page 47

93h

R/W

LED Direct Duty Cycle

Determines the min and max duty

cycle for Direct mode LED operation

F0h

Page 47

94h

R/W

LED Direct Ramp Rates

Determines the rising and falling edge

ramp rates of the LEDs

00h

Page 47

95h

R/W

LED Off Delay

Determines the off delay for all LED

behaviors

00h

Page 48

B1h

Sensor Input 1 Calibra-

tion

Stores the upper 8-bit calibration value

for sensor input 1

00h

Page 51

B2h

Sensor Input 2 Calibra-

tion

Stores the upper 8-bit calibration value

for sensor input 2

00h

Page 51

B3h

Sensor Input 3 Calibra-

tion

Stores the upper 8-bit calibration value

for sensor input 3

00h

Page 51

B9h

Sensor Input Calibra-

tion LSB 1

Stores the 2 LSBs of the calibration

value for sensor inputs 1 - 3

00h

Page 51

FDh

Product ID

Stores a fixed value that identifies

each product

54h

Page 51

FEh

Manufacturer ID

Stores a fixed value that identifies

Microchip

5Dh

Page 52

FFh

Revision

Stores a fixed value that represents

the revision number

83h

Page 52

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

Page

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