CAP1214 datasheet(62/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

6.24

Lid Closure Configuration Register

The Lid Closure Configuration Register controls the settings for the lid closure detection circuitry.

Bit 7 - LID_CLOSE - Enables the lid closure circuitry.

‘0’ (default) - The lid closure circuitry is disabled.

‘1’ The lid closure circuitry is enabled. The device will use the Lid Closure Status registers in

combination with the Lid Closure Pattern register settings to determine when a Lid Closure Event

is flagged. In addition, the Noise Status bits are associated with lid closure.

Bit 1 - COMP_PTRN - Determines how the Lid Closure Status registers are compared against the Lid

Closure Pattern registers. See Section 6.26 for details on how the Lid Closure Pattern registers are

used.

‘0’ (default) - The Lid Closure Status registers are not compared directly against the Lid Closure

Pattern registers. Instead, the number of bits in the Lid Closure Status registers is compared to the

number of bits in the Lid Closure Pattern registers to determine whether a Lid Closure Event is

flagged.

‘1’ - The Lid Closure Status registers are compared directly against the Lid Closure Pattern

registers. If the bits set in the Lid Closure Pattern are also set in the Lid Status registers, a Lid

Closure Event is flagged.

Bit 0 - LID_ALRT - Enables an interrupt if a Lid Closure Event occurs.

‘0’ (default) - If a Lid Closure Event occurs, the ALERT pin is not asserted.

‘1’ - If a Lid Closure Event occurs, the ALERT pin will be asserted.

6.25

Lid Closure Queue Control Register

The Lid Closure Queue Control Register determines the number of consecutive samples for which a

single sensor output is above the Lid Closure Threshold before it is flagged.

A value of 0000b is decoded as 1.

Bits 2 - 0 - QUEUE_L[2:0] - The number of consecutive samples from an individual sensor necessary

to set the Lid Closure status bit associated with the sensor. The queue applies individually to all

sensors (including both buttons and grouped sensors) and applies to setting and clearing the

respective status bit. The queue can range from 1 sample to 8 consecutive samples with a default of

2 consecutive samples.

Table 6.34 Lid Closure Configuration Register

ADDR

R/W

DEFAULT

2Bh

R/W

Lid Closure

Config

LID_

-----

COMP_

PTRN

LID_

ALRT

00h

Table 6.35 Lid Closure Queue Control Register

ADDR

R/W

DEFAULT

2Ch

R/W

Lid Closure

Queue Control

QUEUE_L[2:0]

02h

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