CAP1128 datasheet(58/75 Pages) MICROCHIP

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CAP1128

DS00001622B-page 58

 2015 Microchip Technology Inc.

6.35

LED Configuration Register

The LED Configuration register controls general LED behavior as well as the number of pulses that are sent for the

PULSE LED output behavior.

Bit 6 - RAMP_ALERT - Determines whether the device will assert the ALERT# pin when LEDs actuated by the LED

Output Control register bits have finished their respective behaviors. Interrupts will only be generated if the LED activity

is generated by writing the LED Output Control registers. Any LED activity associated with touch detection will not cause

an interrupt to be generated when the LED behavior has been finished.

• ‘0’ (default) - The ALERT# pin will not be asserted when LEDs actuated by the LED Output Control register have

finished their programmed behaviors.

• ‘1’ - The ALERT# pin will be asserted whenever any LED that is actuated by the LED Output Control register has

finished its programmed behavior.

Bits 5 - 3 - PULSE2_CNT[2:0] - Determines the number of pulses used for the Pulse 2 behavior as shown in Table 6-58.

Bits 2 - 0 - PULSE1_CNT[2:0] - Determines the number of pulses used for the Pulse 1 behavior as shown in Table 6-58.

6.36

LED Duty Cycle Registers

The LED Duty Cycle registers determine the minimum and maximum duty cycle settings used for the LED for each LED

behavior. These settings affect the brightness of the LED when it is fully off and fully on.

The LED driver duty cycle will ramp up from the minimum duty cycle to the maximum duty cycle and back down again.

APPLICATION NOTE: When operating in Direct behavior mode, changes to the Duty Cycle settings will be applied

immediately. When operating in Breathe, Pulse 1, or Pulse 2 modes, the LED must be

unactuated and then re-actuated before changes to behavior are processed.

TABLE 6-57:

LED CONFIGURATION REGISTER

ADDR

R/W

Default

88h

R/W

LED Config

RAMP_

ALERT

PULSE2_CNT[2:0]

PULSE1_CNT[2:0]

04h

TABLE 6-58:

PULSEX_CNT DECODE

PULSEX_CNT[2:0]

Number of Breaths

1 (default - Pulse 2)

5 (default - Pulse 1)

TABLE 6-59:

LED DUTY CYCLE REGISTERS

ADDR

R/W

Default

90h

R/W

LED Pulse 1 Duty

Cycle

P1_MAX_DUTY[3:0]

P1_MIN_DUTY[3:0]

F0h

91h

R/W

LED Pulse 2 Duty

Cycle

P2_MAX_DUTY[3:0]

P2_MIN_DUTY[3:0]

F0h

92h

R/W

LED Breathe

Duty Cycle

BR_MAX_DUTY[3:0]

BR_MIN_DUTY[3:0]

F0h

93h

R/W

Direct Duty Cycle

DR_MAX_DUTY[3:0]

DR_MIN_DUTY[3:0]

F0h

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