ADIN1110BCPZ-R7 datasheet(25/104 Pages) AD

25 / 104 page

Data Sheet

ADIN1110

APPLICATIONS INFORMATION

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Rev. 0 | 25 of 104

3.3 V. For higher current requirements, consider using the circuit

described in Transistor Controlled LED.

Active High LED Polarity

In the 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 selected LED specifications in Table

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

value of 4.7 kΩ are recommended.

Figure 15. 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 2 for information). External pull-up resistors (RPU0, RPU1) with

a value of 4.7 kΩ are recommended.

Figure 16. Recommended Active Low LED Circuit

Transistor Controlled LED

Figure 17 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 17. 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

Crystal

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

Figure 18. To ensure minimum current consumption and minimize

stray capacitances, make connections between the crystal, capaci-

tors, and ground as close to the ADIN1110 as possible. Consult

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.

ADIN1110BCPZ-R7 数据表(PDF) 25 Page - Analog Devices

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