CAP1114 datasheet(42/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

6.2

Button Status Registers

The Button Status Registers store status bits that indicate a button press has been detected. A value

of ‘0’ in any bit indicates that no button press has been detected. A value of ‘1’ in any bit indicates

that a button press has been detected.

All status bits are cleared when the device enters the Deep Sleep or Inactive states (DSLEEP = ‘1’ or

DEACT = ‘1’ - see Section 6.1). All status bits are cleared when the INT bit is cleared and if a touch

on the respective Capacitive Touch Sensor is no longer present. If a touch is still detected, the bits will

not be cleared (but this will not cause the interrupt to be asserted - see Section 6.14)

APPLICATION NOTE: When the Button Status 1 Register is read, the Group Status register will be automatically

cleared. Therefore, the Group Status register should be read prior to reading the Button

Status Registers

6.2.1

Button Status 1

Bit 7 - UP - Indicates that a slide was detected on increasing sensors (i.e. Sensor 8 -> Sensor 9 ->

Sensor 10). This bit is also set if a press is detected on the “Up” portion of the slider. If the Group

auto-repeat is enabled, the ALERT pin will be periodically asserted while a slide or press and hold

event is still detected. This bit is sticky and will remain set until cleared. Once cleared, it will be re-set

when another interrupt is generated in the “UP” direction. This bit is automatically cleared if the DOWN

bit is set.

Bit 6 - DOWN - Indicates that a slide was detected on decreasing sensors (i.e. Sensor 14 -> Sensor

13-> Sensor 12). This bit is also set if a press is detected on the “Down” portion of the slider. If the

Group auto-repeat is enabled, the ALERT pin will be periodically asserted while a slide or press and

hold event is still detected. This bit is sticky and will remain set until cleared. Once cleared, it will be

re-set when another interrupt is generated in the “DOWN” direction. This bit is automatically cleared if

the UP bit is set.

Bit 5 - CS6 - Indicates that a press was detected on Sensor 6. This sensor can be linked to LED6.

‘0’ - A touch was not detected on the corresponding button.

‘1’ - A touch was detected on the corresponding button.

Bit 4 - CS5 - Indicates that a press was detected on Sensor 5. This sensor can be linked to LED5.

Bit 3 - CS4 - Indicates that a press was detected on Sensor 4. This sensor can be linked to LED4.

Bit 2 - CS3 - Indicates that a press was detected on Sensor 3. This sensor can be linked to LED3

Bit 1 - CS2 - Indicates that a press was detected on Sensor 2. This sensor can be linked to LED2.

Bit 0 - CS1 - Indicates that a press was detected on Sensor 1. This sensor can be linked to LED1.

Table 6.3 Button Status Registers

ADDR

R/W

DEFAULT

03h

Button Status 1

DOWN

CS6

CS5

CS4

CS3

CS2

CS1

00h

04h

Button Status 2

CS14

CS13

CS12

CS11

CS10

CS9

CS8

CS7

00h

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