CAP1114 datasheet(86/102 Pages) MICROCHIP

86 / 102 page

Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

APPLICATION NOTE: The PWM frequency is determined based on the selected LED behavior, the programmed

breathe period, and the programmed min and max duty cycles. For the Direct behavior

mode, the PWM frequency is calculated based on the programmed Rise and Fall times. If

these are set at 0, the maximum PWM frequency will be used based on the programmed

duty cycle settings.

6.49

LED Pulse 1 Period Register

The LED Pulse 1 Period Register determines the overall period of a pulse operation as determined by

the LED_CTL registers (see Table 6.69 - setting 01b). 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 as shown

in Table 6.71.

The number of pulses is programmable as determined by the PULSE1_CNT bits (see Section 6.52).

Bit 7 - ST_TRIG - Determines the start trigger for the LED Pulse behavior.

‘0’ (default) - The LED will Pulse when a touch is detected or the drive bit is set.

‘1’ - The LED will Pulse when a release is detected or the drive bit is cleared.

The Pulse 1 operation is shown in Figure 6.1 (non-inverted polarity LEDx_POL = 1) and Figure 6.2

(inverted polarity LEDx_POL = 0).

Pulse 2

The LED will “Pulse” when the start trigger

is detected. When the stop trigger is

detected, it will “Pulse” a programmable

number of times then return to its minimum

brightness.

Touch Detected

or LED Output

Control bit set

Release

Detected or

LED Output

Control bit

cleared

Breathe

The LED will breathe. It will be driven with

a duty cycle that ramps up from the

programmed minimum duty cycle (default

0%) to the programmed maximum duty

cycle (default 100%) and then back down.

Each ramp takes up 50% of the

programmed period. The total period of

each “breath” is determined by the LED

Breathe Period controls - see Section 6.51.

Touch Detected

or LED Output

Control bit set

Release

Detected or

LED Control

Output bit

cleared

Table 6.70 LED Pulse 1 Period Register

ADDR

R/W

B6B5B4B3B2

DEFAULT

84h

R/W

LED Pulse 1

Period

ST_

TRIG

P1_

PER6

P1_

PER5

P1_

PER4

P1_

PER3

P1_

PER2

P1_

PER1

P1_

PER0

20h

Table 6.69 LEDx_CTL Bit Decode (continued)

LEDX_CTL

[1:0]

OPERATION

DESCRIPTION

START

TRIGGER

STOP

TRIGGER

CAP1114 датащи(PDF) 86 Page - Microchip Technology

CAP1114 датащи(HTML) 86 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL