CAP1214 datasheet(91/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

6.53

LED Pulse 2 Period Register

The LED Pulse 2 Period Register determines the overall period of a pulse operation as determined by

the LED_CTL registers (see Table 6.73 - setting 10b). Each LSB represents 32ms so that a setting of

14h (20d) would represent a period of 640ms. The total range is from 32ms to 4.06 seconds (see

Table 6.75).

The number of pulses is programmable as determined by the PULSE2_CNT bits (see Section 6.55).

The Pulse 2 Behavior is shown in Figure 6.3 (non-inverted polarity LEDx_POL = 1) and Figure 6.4

(inverted polarity LEDx_POL = 0).

. . .

7Ch

124

3,968

7Dh

125

4,000

7Eh

126

4,032

7Fh

127

4,064

Table 6.76 LED Pulse 2 Period Register

ADDR

R/W

DEFAULT

85h

R/W

LED Pulse 2

Period

P2_

PER6

P2_

PER5

P2_

PER4

P2_

PER3

P2_

PER2

P2_

PER1

P2_

PER0

14h

Figure 6.3 Pulse 2 Behavior with Non-Inverted Polarity

Table 6.75 LED Pulse / Breathe Period Example (continued)

SETTING

(HEX)

SETTING (DECIMAL)

TOTAL PULSE / BREATHE PERIOD

(ms)

. . .

Normal –

untouched

operation

Normal –

untouched

operation

Touch Detected

(100% - Pulse 2 Min Duty Cycle) *

Brightness

(100% - Pulse 2 Max Duty Cycle) * Brightness

X additional pulses after release

Release Detected

Pulse

Period

(P2_PER)

LED

Brightness

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