CAP1114 datasheet(75/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1114

Revision 1.1 (02-04-11)

DATASHEET

The Sensor 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.

The routine uses an internal adder to add the current count value for each reading to the sum of the

previous readings until sample size has been reached. At this point, the upper 16 bits are taken and

used as the Sensor Base Count. The internal adder is then reset and the re-calibration routine

continues.

The data presented is determined by the BASE_SHIFT bits (see Section 6.13).

6.39

LED Status Registers

The LED Status Registers indicate which LED output has completed its actuated activity. The bits are

cleared when the INT bit has been cleared. Likewise, these bits are cleared when the DSLEEP bit is

set.

6.39.1

LED Status 1

Bit 7 - LED8_DN - Indicates that LED8 has finished its ramping behavior as determined by the

LED8_CTL bits.

Bit 6 - LED7_DN - Indicates that LED7 has finished its ramping behavior as determined by the

LED7_CTL bits.

56h

Sensor 7 Base

Count

128

00h

57h

Sensor 8 Base

Count

128

00h

58h

Sensor 9 Base

Count

128

00h

59h

Sensor 10

Base Count

128

00h

5Ah

Sensor 11

Base Count

128

00h

5Bh

Sensor 12

Base Count

128

00h

5Ch

Sensor 13

Base Count

128

00h

5Dh

Sensor 14

Base Count

128

00h

Table 6.58 LED Status Registers

ADDR

R/W

DEFAULT

60h

LED Status 1

LED8_

LED7_

LED6_

LED5_

LED4_

LED3_

LED2_

LED1_

00h

61h

LED Status 2

LED11_

LED10_

LED9_

00h

Table 6.57 Sensor Base Count Registers (continued)

ADDR

R/W

DEFAULT

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