CAP1214 datasheet(42/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

Bit 1 - PWR_LED - Controls the output of LED11 based on the state of bits 5 and 4.

‘0’ (default) - The LED11 output is in the “inactive” or off state. The LED can still be driven by setting

bit 2 LED11_DR in the LED Output Control 2 Register (74h).

‘1’ - The LED11 output is active in one of the following conditions:

a. Both bits 4 and 5 are set to a logic ‘0’. The LED will behave as defined by the LED11_CTL

bits (see Section 6.51).

b. Either bit 4 or bit 5 is set to a logic ‘1’. The LED will behave as defined by the LED11_ALT

bits (see Section 6.51).

Bit 0 - INT - Indicates that there is an interrupt. This bit is only set if the ALERT pin has been asserted.

If a channel detects a press and its associated interrupt enable bit is set to a logic ‘0’, no action is

taken.

This bit is cleared by writing a logic ‘0’ to it. When this bit is cleared, the ALERT pin will be deasserted

and all status registers will be cleared if the condition has been removed.

‘0’ - No interrupt pending.

‘1’ - A button press has been detected on one or more channels and the interrupt has been

asserted.

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

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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