LM3559 datasheet(22/50 Pages) TI1

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tBLINK

tPWM

ITORCH_MIN

Duty

Cycle

tBLINK set via bits [7:6] of Privacy Register

Duty cycle set via bits [2:0] of Privacy Register

tPWM set via bits[2:0] of the Privacy PWM Register

LM3559

SNVS624B – JUNE 2011 – REVISED JUNE 2016

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Device Functional Modes (continued)

Figure 36. Privacy Indicate Timing

8.4.6 GPIO1 Mode

With bit [0] of the GPIO Register set to 1, the TX1/TORCH/GPIO1 pin is configured as a logic I/O. In this mode

the TX1/TORCH/GPIO1 pin is readable and writable as a logic input/output via bits [2:1] of the GPIO Register.

See Table 9.

8.4.7 TX2/INT/GPIO2

The TX2/INT/GPIO2 pin has a triple function. In TX2 mode (default) the TX2/INT/GPIO2 pin is an active high

flash interrupt. With GPIO Register bit [3] = 1 the TX2/INT/GPIO2 pin is configured as general purpose logic I/O.

With GPIO Register bit [6] = 1, and with the TX2/INT/GPIO2 pin configured as a GPIO2 output, the

TX2/INT/GPIO2 pin is an interrupt output.

8.4.8 TX2 Mode

In TX2 mode, when Configuration Register 1, bit [6] = 0, the TX2/INT/GPIO2 pin has active low polarity. Under

this condition when the LM3559 is engaged in a flash event and TX2 is pulled low, both LED1 and LED2 are

forced into torch mode. In TX2 mode with Configuration Register 1, bit [6] = 1 the TX2/INT/GPIO2 input has

active high polarity. Under this condition when the LM3559 is engaged in a flash event and the TX2/INT/GPIO2

pin is driven high, both LED1 and LED2 are forced into torch mode. During a flash interrupt event if the

TX2/INT/GPIO2 input is disengaged the LED current returns to the previous flash current level. During a flash

event, if TX2 is active, the LED current sources still turn off after the flash timeout. Figure 25 details the

functionality of the TX2 Interrupt.

LM3559 Datasheet(PDF) 22 Page - Texas Instruments