ADIN1111CCPZ-R7 datasheet(29/109 Pages) AD

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Data Sheet

ADIN1111

APPLICATIONS INFORMATION

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Rev. A | 29 of 109

Figure 21. Recommended Active High LED Circuit

Active Low LED Polarity

In active low configuration, the LED_x pin can drive an external

LED from the cathode side. Select the R0 and R1 resistors to

control the LED current (refer to the selected LED specifications in

Table 1 for information). External pull-up resistors (RPU0, RPU1) with

a value of 4.7 kΩ are recommended.

Figure 22. Recommended Active Low LED Circuit

Transistor Controlled LED

Figure 23 displays a typical configuration where the LED current

required is higher than what the LED_0 and LED_1 pins can supply.

The circuit operates using the active high LED mode. An external

transistor such as an N-channel metal-oxide semiconductor field

effect transistor (MOSFET) can be used. The transistor must be

selected so the gate input capacitance is not sinking current above

the maximum rating of the LED during the actuation (refer to the

transistor technical specifications for information). If required, the

inrush current can be reduced by placing a resistance between

the transistor gate and the ADIN1110 pin, and/or adding a parallel

capacitor between the GND and the LED_x pin. The additional re-

sistor and capacitor values must be defined based on the transistor

selection.

Select the R0 and R1 resistors to control the LED current. External

pull-down resistors (RPD0, RPD1) with a value of 4.7 kΩ are recom-

mended.

VCC can be set to match the LED power requirements.

Figure 23. Recommended Transistor Controlled LED Circuit

Autosense Polarity

In autosense mode, the polarity of the LED is automatically detect-

ed during power-up, hardware reset, or software reset.

LED_0 (internal pull-up) and LED_1 (internal pull-down) have differ-

ent autosense behaviors due to their internal pull-up and pull-down

configurations. Use one of the configurations described in the

Active High LED Polarity, Active Low LED Polarity, and Transistor

Controlled LED sections so that the two LED_x pins can be control-

led the same way.

COMPONENT RECOMMENDATIONS

The ADIN1111 requires an external 25 MHz clock, which can be

sourced from an external crystal oscillator or an external single-

ended clock.

The signal voltage on the XTAL_I/CLK_IN pin (VCLK_IN) must be

a sine or filtered square wave signal with a peak-to-peak voltage

range from 0.8 V to 2.5 V. For the single-ended clock option, a

VCLK_IN with a 1.0 V p-p swing is recommended to achieve best

performance.

Various circuit configurations are proposed in the following sections.

A common circuit topology can be used across these options with a

change to the passive component values.

Note that during normal operation, a 25 MHz reference clock

generated from the external clock source input (a crystal or 25 MHz

external single-ended clock) is provided on the CLK25_REF output

pin. This pin can be used as a reference clock for other circuits,

such as another 10BASE-T1L device. CLK25_REF is disabled in

reset mode.

External Crystal Oscillator

The typical connection for an external crystal (XTAL) is shown in

Figure 24.

To ensure minimum current consumption and minimize stray ca-

pacitance, make connections between the crystal, capacitors, and

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