CAP1114 datasheet(68/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

Bit 7 - ACC_INT_EN - Enables the device to generate extra interrupts after an accelerated slide has

been detected.

‘0’ - The device will not generate extra interrupts during or after the slide has been detected.

‘1’ (default) - The device will generate extra interrupts after an accelerated slide is detected. The

number of extra interrupts generated will be proportional to the speed of the accelerated slide but

will not exceed the maximum number of extra interrupts as determined by the MAX_INT bits.

Bits 6-4 - MAX_INT[2:0] - (default 100b) Determine the maximum number of extra interrupts that will

be generated after a single slide (regardless of length). The variable “T” is the actual slide time and

the parameter SLIDE_TIME is set by bits [3:2] of this register.

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

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