EPC635 datasheet(84/97 Pages) EPC

84 / 97 page

8.7.6. LED_driver

LED_driver

Mod./demod. registers, SEG1 *: LED driver

0x90

Bit No.

Bit name

led_drv_sel

led2_en

led_on

reserved

led_drv_en

led_inv_en

led_ssr_en

Operation

Default

0xC4

led_drv_sel:

LED driver output max. current select e.g. for LED current 200mA

≙ 100%

00:

33%

01:

46%

10:

64%

11: 100%

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0.1

0.2

0.3

0.4

0.5

0.6

0.7

I_LED led_drv_sel = 11

I_LED led_drv_sel = 01

I_LED led_drv_sel = 10

I_LED led_drv_sel = 00

VDD_LED (V)

Figure 69: Output characteristic ILED versus VDDLED

Refer for maximum values of VDDLED and ILED to Table 1.

led2_en:

LED2 pin enable

0: disabled (i.e. 0V)

1: enabled

led_on:

LED/LD permanently on (DC) (torch function)

0: off

1: on

led_drv_en:

LED driver internal power enable (independent of the modulator)

0: disable

1: enable

led_inv_en:

LED signal inversion. Inversion of the output levels of the LED signal.

0: disable (signal is active when pin LED = 0, VSSLED)

1: enable (signal is active when pin LED = 1, open-drain)

Note: When led_inv_en = 0: It can directly sink the LED turn-on current without additional external driver.

When led_inv_en = 1: It needs an external pull-up resistor (open-drain) to drive the inverted value for the

external LED drive circuitry.

led_ssr_en:

LED slow slew rate enable.

0: disable

1: enable

Characteristics subject to change without notice

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