CAP1214 datasheet(47/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

APPLICATION NOTE: It is likely that recalibration will occur while the lid is closed, resulting in negative delta counts

until recalibration takes place.

6.9

GPIO Status Register

The GPIO Status Register bits are set whenever one of the GPIO inputs changes states. If the LEDx

/ GPIOx pin is not configured as a GPIO or as an input, the respective bit will be set to a logic ‘0’.

The bits are cleared when the register is read.

6.10

Group Status Register

The Group Status Register indicates that one or more actions were detected on the Grouped sensors.

The detectable actions are described in Section 5.5 and Section 5.6.

Bit 7 - LID - Indicates that a Lid Closure Event has been detected. This bit is sticky. When it is set, it

will remain set until read. When a Lid Closure Event is detected, all new touches will be blocked.

Bit 6 - MULT - This bit is asserted if one or more touches are being blocked because greater than N

buttons are simultaneously pressed.

Bit 5 - RESET - Indicates that the device has exited the reset state. This bit may be set via a power

on reset or upon release of the RESET pin. When it is set, it will remain set until read.

Bit 3 - UP - Indicates that a slide was detected on increasing sensors (i.e. Sensor 8 -> Sensor 9 ->

Sensor 10) or on CS14 when the Grouped sensors are ungrouped. This bit is also set if a touch (tap

or press and hold event) 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 detected.

This bit will be cleared when read and re-set when another interrupt is generated. This bit is cleared

automatically if the DOWN bit is set.

Bit 2 - DOWN - Indicates that a slide was detected on decreasing sensors (i.e. Sensor 14 -> Sensor

13 -> Sensor 12) or on CS8 when the Grouped sensors are ungrouped. This bit is also set if a touch

(tap or press and hold event) 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

detected. This bit will be cleared when read and re-set when another interrupt is generated. This bit

is automatically cleared if the UP bit is set.

Bit 1 - TAP - Indicates that a tap was detected on one of the sensors within the Group. The relative

position of the tap is indicated by the UP and DOWN bits so that a tap on the “UP” side of the group

will assert the UP bit as well as the TAP bit. If the tap event is detected in the “center” of the slider

that is neither “UP” nor “DOWN”, the bit will be set; however, no interrupt will be generated. This bit

is sticky and will remain set until read.

Table 6.11 GPIO Status Register

ADDR

R/W

DEFAULT

0Eh

R-C

GPIO Status

GPIO8_

STS

GPIO7_

STS

GPIO6_

STS

GPIO5_

STS

GPIO4_

STS

GPIO3_

STS

GPIO2_

STS

GPIO1_

STS

00h

Table 6.12 Group Status Register

ADDR

R/W

DEFAULT

0Fh

R-C

Group Status

LID

MULT

RESET

DOWN

TAP

00h

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