CAP1114 datasheet(45/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1114

Revision 1.1 (02-04-11)

DATASHEET

6.5

Vendor ID Register

The Vendor ID Register stores an 8-bit value that represents SMSC.

6.6

Volumetric Step Register

The Volumetric Step Register controls the size of a step to the volumetric data when a slide is detected

in the UP and DOWN directions.

Bits 3 - 0 - VOL_STEP[3:0] - Determines the volumetric data step when a slide is detected. Each LSB

corresponds to a value of ±1.

6.7

Noise Status Registers

The Noise Status Registers store status bits that are generated from the analog block if the detected

noise is above the operating region of the analog detector. These bits indicate that the most recently

received data from the sensor is invalid and should not be used for touch detection. Furthermore, so

long as the bit is set for a particular channel, no decisions are made with the data. The queues are

not updated, a touch is not detected, and a release is not detected.

These bits will also be set if RF noise is detected on any individual sensor. With the exception of CS1,

these conditions are OR’d together when setting the bits. For CS1, the S1_RF_NOISE bit will be set

when RF noise is detected, and the S1_NOISE bit will be set if the detected noise is above the

operating region of the detector.

These bits are not sticky and will be cleared automatically if the analog block does not report a noise

error.

Table 6.7 Vendor ID Register

ADDR

R/W

B7B6B5B4B3B2B1B0

DEFAULT

08h

Vendor ID

01011101

5Dh

FEh

Table 6.8 Volumetric Step Register

ADDR

R/W

DEFAULT

09h

R/W

Volumetric Step

----

VOL_STEP[3:0]

01h

Table 6.9 Noise Status Registers

ADDR

R/W

DEFAULT

0Ah

Noise Status 1

S1_RF_

NOISE

S7_

NOISE

S6_

NOISE

S5_

NOISE

S4_

NOISE

S3_

NOISE

S2_

NOISE

S1_

NOISE

00h

0Bh

Noise Status 2

S14_

NOISE

S13_

NOISE

S12_

NOISE

S11_

NOISE

S10_

NOISE

S9_

NOISE

S8_

NOISE

00h

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