ADIN1100CCPZ-R7 datasheet(34/78 Pages) AD

34 / 78 page

Data Sheet

ADIN1100

APPLICATIONS INFORMATION

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Rev. 0 | 34 of 78

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 19. 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 20. 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 21, VCC is the power supply used to

supply the LEDs.

Figure 21. 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

Crystal

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

in Figure 22. To ensure minimum current consumption and to min-

imize stray capacitances, make connections between the crystal,

capacitors, and ground as close to the ADIN1100 as possible. Con-

sult individual crystal vendors for recommended load information

and crystal performance specifications.

The crystal specification defines CL. CPCB1 and CPCB2 are the

parasitic impedances of the PCB between XTAL_I/CLK_IN and

ground, and between XTAL_O and ground, respectively. CX1 is the

capacitor connected to XTAL_I/CLK_IN, and CX2 is the capacitor

connected to XTAL_O.

Assuming the following:

►

CPCB1 ≈ CPCB2 ≈ CPCBx

►

CX1 ≈ CX2 ≈ CXx

Then, CXx = 2 × CL – CPCBx – 3 pF

Choose precision capacitors for CXx with low appreciable tempera-

ture coefficient to minimize frequency errors.

To ensure minimum current consumption and to minimize stray ca-

pacitances, make the connections between the crystal, capacitors,

and ground as close to the ADIN1100 as possible.

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