CAP1028 datasheet(59/71 Pages) SMSC

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8 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

SMSC CAP1028

Revision 1.1 (08-05-09)

DATASHEET

5.29

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 5.43 - 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 5.45).

APPLICATION NOTE: Due to constraints on the LED Drive PWM operation, any Breathe Period less than 160ms

(05h) may not be achievable. The device will breathe at the minimum period possible as

determined by the period and min / max duty cycle settings.

The Pulse 2 Behavior is shown in Figure 5.3 for non-inverted polarity and in Figure 5.4 for inverted

polarity.

Table 5.45 LED Pulse / Breathe Period Example

SETTING

(HEX)

SETTING (DECIMAL)

TOTAL BREATHE / PULSE

PERIOD (MS)

00h

01h

02h

03h

04h

128

. . .

7Ch

124

3,968

7Dh

125

4,000

7Eh

126

4,032

7Fh

127

4.064

Table 5.46 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

CAP1028 Datasheet(PDF) 59 Page - SMSC Corporation

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