CAP1014 datasheet(71/84 Pages) SMSC

71 / 84 page

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1014

Revision 1.65 (08-11-09)

DATASHEET

5.42

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 5.59 - 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 5.61).

The Pulse 2 Behavior is shown in Figure 5.3 (non-inverted polarity) and Figure 5.4 (inverted polarity).

04h

128

. . .

7Ch

124

3,968

7Dh

125

4,000

7Eh

126

4,032

7Fh

127

4.064

Table 5.62 LED Behavior Registers

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 5.3 Pulse 2 Behavior with Non-Inverted Polarity

Table 5.61 LED Pulse / Breathe Period Example (continued)

SETTING

(HEX)

SETTING (DECIMAL)

TOTAL BREATHE / PULSE

PERIOD (MS)

. . .

Normal –

untouched

operation

Normal –

untouched

operation

Touch Detected

(100% - Pulse 2 Min Duty Cycle) *

Brightness

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

5 additional pulses after release

Release Detected

Breathe

and Pulse

Period

(P2_PER)

LED

Brightness

CAP1014 Datasheet(PDF) 71 Page - SMSC Corporation

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