CAP1214 datasheet(69/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

Bits 3-2 - SLIDE_TIME[1:0] - (default 01b) - Determines how fast a slide must be to generate extra

interrupts. This is the maximum slide time that will result in extra interrupts being generated. If the slide

time is greater than SLIDE_TIME, no extra interrupts will be generated.

Bits 1 - 0 - RPT_SCALE[1:0] - (default 01b) - Determines how much to increase the Repeat Rate

based on slide speed. The slide speed is determined by counting how many sensors are touched in

approximately 100msec. The Repeat Rate is then increased various amounts based on the

RPT_SCALE parameter.

When read in Table 6.48, the repeat rate given is the number of measurement cycles between

interrupts generated.

Table 6.46 MAX_INT Bit Decode

MAX_INT[2:0]

MAX #

INTERRUPTS

# INTERRUPTS

FOR T < 1/2

SLIDE_TIME

# INTERRUPTS

FOR 1/2 < T <

3/4 SLIDE_TIME

# INTERRUPTS

FOR 3/4 < T <

FULL

SLIDE_TIME

Table 6.47 SLIDE_TIME Bit Decode

SLIDE_TIME[1:0]

APPROXIMATE SLIDE TIME (MSEC)

350

560 (default)

770

980

Table 6.48 RPT_SCALE Bit Decode

NUMBER OF SENSORS IN

100MSEC

REPEAT RATE (MSEC)

RPT_SCALE[1:0]

>=5

435

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