ADIN1100CCPZ-R7 datasheet(20/80 Pages) AD

20 / 80 page

Data Sheet

ADIN1100

THEORY OF OPERATION

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Rev. B | 20 of 80

STATUS LEDS

Overview

The LED_0 and LED_1 is only available in ADIN1100 pins can be

used to connect external LEDs to indicate the ADIN1100 link status

and transmit or receive activity. The activity assigned to each LED

is configurable through LED_CNTRL (see the LED Control Register

section).

The LED pins are suitable for ultra low power LEDs. The maximum

output current for the LED_0 and LED_1 pins is 8 mA with a

VDDIO = 3.3 V. For higher LED power requirements, the use of an

external transistor is recommended, as described in the Transistor

Controlled LED section.

The LED_x pins can also be connected to a host microcontroller

GPIO (configured as a pulse-width modulated input or hardware

interrupt). This configuration can be useful in applications where the

user interface must be fully handled by an external host controller

(for example, an external LED module or display).

If the LED_0 and LED_1 pins are directly connected to a host

controller, it is recommended to place a low value resistance in

series between the ADIN1100 LED_x pins and the host controller

to avoid any potential current surge. The resistor value must be

defined based on host controller capabilities and the ADIN1100

LED_x pin output current capabilities listed in Table 1.

LED Pin Multiplexing

For the LED_1 pin only, an internal multiplexer must be configured

to enable the LED_1 signal on the pin. LED_1 is disabled by default

and can be enabled using the DIGIO_LED1_PINMUX bits (see the

Pin Mux Configuration 1 Register section).

The LED_0 pin does not need multiplexing.

LED Polarity

The LED_0 and LED_1 pins can be configured to support various

LED circuit polarities through the LED polarity mode feature (see

the LED Polarity Register section). Three polarity modes are availa-

ble for each LED, as follows:

►

Autosense (default)

►

Active high

►

Active low

In autosense mode, the ADIN1100 automatically senses the pin at

power-up or reset to select the appropriate polarity configuration.

In active high mode, the ADIN1100 is configured to drive the LED

from the anode side.

In active low mode, the ADIN1100 is configured to drive the LED

from the cathode side.

Example circuits are described in the LED Circuit Examples sec-

tion.

LED Function

LED_0 and LED_1 can be configured to display various activities

of the ADIN1100 using the LED function feature. The LED function

is configurable using the LED0_FUNCTION and LED1_FUNCTION

bits (see the LED Control Register section).

Note that the 7, 8, 9, and 10 (decimal) bit settings for LEDx_FUNC-

TION are not available in LED Mode 2.

LED Mode

LED_0 and LED_1 activity behavior can be configured using the

two LED modes, as follows:

►

LED Mode 1: blink duty cycle defined using the

LED0_BLINK_TIME_CNTRL (see the LED_0 On/Off Blink Time

►

LED Mode 2: blink duty cycle automatically defined by the

ADIN1100 based on activity level (%)

LED_x Pins Configuration Summary

See Table 13 for the configuration options of the LED_x pins.

Table 13. LED_x Pins Configuration Summary

Parameter

LED_0

LED_1

Pin Number

6 (ADIN1100 only)

Internal Pull-Up or Pull-Down Resistor

Pull-up

Pull-down

Status at Power-Up or Reset

Enabled

Disabled (via pin mux)

LED Pin Mux

Not applicable

DIGIO_LED1_PINMUX bits (see the Pin Mux Configuration

1 Register section)

Enable LED

LED0_EN bit (see the LED Control Register section)

LED1_EN bit (see the LED Control Register section)

LED Polarity

LED0_POLARITY bits (see the LED Polarity Register section)

LED1_POLARITY bits (see the LED Polarity Register

section)

LED Mode

LED0_MODE bit (see the LED Control Register section), default:

LED Mode 1

LED1_MODE bit (see the LED Control Register section),

default: LED Mode 1

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