CAP1128 datasheet(49/75 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001622B-page 49

CAP1128

of approximately 0.25% of the base capacitance (or a

ΔC of 25fF from a 10pF base

capacitance). Conversely a value of 1x is the least sensitive setting available. At these

settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts

out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance

(or a

ΔC of 3.33pF from a 10pF base capacitance).

6.23

Standby Threshold Register

The Standby Threshold register stores the delta threshold that is used to determine if a touch has been detected. When

a touch occurs, the input signal of the corresponding sensor pad changes due to the capacitance associated with a

touch. If the sensor input change exceeds the threshold settings, a touch is detected.

6.24

Sensor Input Base Count Registers

The Sensor Input Base Count registers store the calibrated “Not Touched” input value from the capacitive touch sensor

inputs. These registers are periodically updated by the re-calibration routine.

TABLE 6-41:

STBY_SENSE BIT DECODE

STBY_SENSE[2:0]

Sensitivity Multiplier

210

128x (most sensitive)

001

64x

32x (default)

011

16x

100

101

110

1x - (least sensitive)

TABLE 6-42:

STANDBY THRESHOLD REGISTER

ADDR

R/W

B5B4

B3B2

B1B0

Default

43h

R/W

Standby Thresh-

old

-64

40h

TABLE 6-43:

SENSOR INPUT BASE COUNT REGISTERS

ADDR

R/W

B5B4

B3B2

B1B0

Default

50h

Sensor Input 1

Base Count

128

C8h

51h

Sensor Input 2

Base Count

128

C8h

52h

Sensor Input 3

Base Count

128

C8h

53h

Sensor Input 4

Base Count

128

C8h

54h

Sensor Input 5

Base Count

128

C8h

55h

Sensor Input 6

Base Count

128

C8h

56h

Sensor Input 7

Base Count

128

C8h

57h

Sensor Input 8

Base Count

128

C8h

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