CAP1214 datasheet(63/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

6.26

Lid Closure Pattern Registers

The Lid Closure Pattern Registers act as a pattern to identify an expected sensor profile that is

consistent with lid closure. They are only used when lid closure is enabled (see Section 6.24, "Lid

Closure Configuration Register"). There are two methods for how the Lid Closure Status Registers are

used with the Lid Closure Pattern registers: as specific sensors that must exceed the lid closure

threshold or as the number of sensors that must exceed the lid closure threshold. Which method is

used is based on bit 1 in the Lid Closure Configuration Register. The methods are described below. A

Lid Closure Event is flagged in the Group Status register (see Section 6.10, "Group Status Register").

1. Specific Sensors: If the bits set in the Lid Closure Pattern are also set in the Lid Status registers,

a Lid Closure Event is flagged.

2. Number of Sensors: 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. If any one of the conditions below is met, the Lid Closure Event is flagged.

If the number of bits in Lid Closure Status 1 register equals or exceeds the number of bits in

the Lid Closure Pattern 1 register, a Lid Closure Event is flagged. In other words, if the number

of simultaneous sensors 1-7 exceeding the lid closure threshold meets or exceeds the number

of bits in the Lid Closure Pattern 1 register, a Lid Closure Event is flagged.

If the number of bits in Lid Closure Status 2 register equals or exceeds the number of bits in

the Lid Closure Pattern 2 register, a Lid Closure Event is flagged. In other words, if the number

of simultaneous grouped sensors 8-14 exceeding the lid closure threshold meets or exceeds

the number of bits in the Lid Closure Pattern 2 register, a Lid Closure Event is flagged.

If the total number of bits in both the Lid Closure Status 1 and 2 registers equals or exceeds

the total number of bits in both the Lid Closure Pattern 1 and 2 registers, a Lid Closure Event

is flagged. In other words, if the total number of sensors above the lid closure threshold is

greater than or equal to the number of sensors required for both Lid Closure Patterns, a Lid

Closure Event is flagged.

A value of 00h in both registers will effectively disable the Lid Closure circuitry and clear the

LID status bit.

6.27

Recalibration Configuration Register

The Recalibration Configuration Register controls the automatic re-calibration routine settings as well

as advanced controls to program the Sensor Threshold register settings and interrupt behavior.

Table 6.36 Lid Closure Pattern Registers

ADDR

R/W

DEFAULT

2Dh

R/W

Lid Closure

Pattern 1

S7_LM

S6_LM

S5_LM

S4_LM

S3_LM

S2_LM

S1_LM

7Fh

2Eh

R/W

Lid Closure

Pattern 2

S14_

S13_

S12_

S11_

S10_

S9_LM

S8_LM

7Fh

Table 6.37 Recalibration Configuration Register

ADDR

R/W

DEFAULT

2Fh

R/W

Recalibration

Configuration

BUT_

LD_TH

GP_

LD_TH

NEG_DELTA_

CNT[1:0]

CAL_CFG[2:0]

93h

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