ADIN1100CCPZ-R7 datasheet(35/80 Pages) AD

35 / 80 page

Data Sheet

ADIN1100

APPLICATIONS INFORMATION

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Rev. B | 35 of 80

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

a VDDIO = 3.3 V (see the Specifications section for details). For

higher current requirements, consider using the circuit described in

the Transistor Controlled LED section.

Active High LED Polarity

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

LED from the anode side. Select the R0 and R1 resistors to control

the LED current (refer to the LED specifications in Table 1 for

information). External pull-down resistors (RPD0, RPD1) with a value

of 4.7 kΩ are recommended.

Figure 20. Active High LED Polarity Configuration

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 LED specifications in Table 1

for information). External pull-up resistors (RPU0, RPU1) with a value

of 4.7 kΩ are recommended.

Figure 21. Active Low LED Polarity Configuration

Transistor Controlled LED

The following circuit 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 MOSFET transistor

can be used. The transistor must be selected so that the gate input

capacitance is not sinking current above the maximum rating of the

LED_x pin 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

ADIN1100 pin and/or adding a parallel capacitor between the GND

and the LED_x pin. The additional resistor and capacitor values

must be defined based on the transistor selection.

Select the R0 and R1 resistors to control the LED current (refer to

the selected LED and transistor specifications of the manufacturer

for information).

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

are recommended. In Figure 22, VCC is the power supply used to

supply the LEDs.

Figure 22. Transistor Controlled LED Configuration

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 different

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 LEDs can be controlled the

same way.

COMPONENT RECOMMENDATIONS

The ADIN1100 requires an external 25 MHz or 50 MHz clock, which

can be sourced from an external crystal oscillator (25 MHz) or an

external single-ended clock (25 MHz or 50 MHz). The RMII requires

an external 50 MHz clock as described in the External 50 MHz

Clock Input for RMII Mode section.

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.

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