CAP1026 datasheet(59/70 Pages) SMSC

59 / 70 page

6 Channel Capacitive Touch Sensor with 2 LED Drivers

Datasheet

SMSC CAP1026

Revision 1.1 (08-05-09)

DATASHEET

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.

5.30

LED Breathe Period Register

Figure 5.3 Pulse 2 Behavior with Non-Inverted Polarity

Figure 5.4 Pulse 2 Behavior with Inverted Polarity

Table 5.47 LED Breathe Period Register

ADDR

R/W

DEFAULT

86h

R/W

LED Breathe

Period

BR_

PER6

BR_

PER5

BR_

PER4

BR_

PER3

BR_

PER2

BR_

PER1

BR_

PER0

5Dh

. . .

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

Breathe

and Pulse

Period

(P2_PER)

LED

Brightness

Normal – untouched

operation

Normal – untouched

operation

Touch Detected

Pulse 2 Max Duty Cycle * Brightness

Pulse 2 Min Duty Cycle * Brightness

X additional pulses after release

Release Detected

Breathe

and Pulse

Period

LED

Brightness

. . .

CAP1026 Datasheet(PDF) 59 Page - SMSC Corporation

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