ADIN2111CCPZ-R7 datasheet(12/129 Pages) AD

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Data Sheet

ADIN2111

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

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Rev. A | 12 of 129

Table 8. Pin Function Descriptions (Continued)

Pin No.

Mnemonic1

PU/PD2

Description

P2_LED_1/P2_TX2P4_EN

General-Purpose, Programmable LED Indicator 1 for Port 2 (P2_LED_1). The LED can be

active high or active low. The default configuration is P2_LED_1 disabled. See the Status

LEDs section.

Port 2 Transmit Level Amplitude Hardware Configuration Pin Signal (P2_TX2P4_EN). Set

high for 1.0 V p-p transmit amplitude only. Set low to support both 1.0 V p-p and 2.4 V p-p

transmit amplitude. See Table 20. The default configuration is 1.0 V p-p and 2.4 V. This pin

is provided with an internal pull-down resistor.

LDO and Reference Decoupling

CEXT_2

N/A

Port 2 PHY External Decoupling for Band Gap Voltage Reference. Connect a 0.1 μF

capacitor to ground as close as possible to this pin. Do not use this pin as a voltage

source for an external circuit.

CEXT_3

N/A

Port 2 PHY External Decoupling for LDO Circuit. Connect a 1 μF capacitor to ground as

close as possible to this pin. Do not use this pin as a voltage source for an external circuit.

CEXT_6

N/A

Port 1 PHY External Decoupling for Band Gap Voltage Reference. Connect a 0.1 μF

capacitor to ground as close as possible to this pin. Do not use this pin as a voltage

source for an external circuit.

CEXT_7

N/A

Port 1 PHY External Decoupling for LDO Circuit. Connect a 1.0 μF capacitor to ground as

close as possible to this pin. Do not use this pin as a voltage source for an external circuit.

Power and Ground Pins

6, 7, 29, 30

AVDD_H

N/A

Main Analog Supply Voltage for the Various Analog Circuits in the Device. This supply

rail can be supplied by 1.8 V to 3.3 V depending on the transmit level configuration.

If AVDD_H is 3.3 V, both the 1.0 V p-p and 2.4 V p-p transmit operating modes are

supported. If AVDD_H is 1.8 V, only the 1.0 V p-p transmit operating mode is supported.

Connect 0.1 μF and 0.01 μF capacitors to GND as close as possible to this pin.

12, 13, 35, 36

AVDD_L

N/A

Main Analog Supply Voltage for the Internal LDO Circuits. This supply rail can be supplied

by 1.8 V to 3.3 V. AVDD_L can be connected directly to the AVDD_H rail in long reach

applications or alternatively to the VDDIO rail when the device is configured with dual

supplies for lower power consumption. Connect 0.1 μF and 0.01 μF capacitors to GND as

close as possible to this pin.

18, 46

VDDIO

N/A

3.3 V, 2.5 V, or 1.8 V Digital Power for the SPI Host Interface. Connect 0.1 μF and 0.01 μF

capacitors to GND as close as possible to the pin.

DLDO2_1P1

N/A

Output from the Internal 1.1 V LDO Circuit 2. When using the internal LDO, connect this

pin directly to the DVDD_1P1 pin. Connect a 0.68 μF capacitor to ground as close as

possible to this pin.

DVDD2_1P1

N/A

Input for PHY 1.1 V DVDD Supply Rail 2. When using the internal LDO regulator, connect

this pin directly to the DLDO2_1P1 pin. Alternatively, an external 1.1 V rail can be provided

to the DVDD_1P1 pin for greater power efficiency. Connect a 0.1 µF to ground as close as

possible to this pin.

DLDO1_1P1

N/A

Output from the 1.1 V LDO Circuit 1. When using the internal LDO, connect this pin

directly to the DVDD_1P1 pin 38. Connect a 0.68 μF capacitor to ground as close as

possible to this pin.

DVDD1_1P1

N/A

Input for PHY 1.1 V DVDD Supply Rail 1. When using the internal LDO regulator, connect

this pin directly to the DLDO1_1P1 pin. Alternatively, an external 1.1 V rail can be provided

to the DVDD_1P1 pin for greater power efficiency. Connect a 0.1 µF to ground as close as

possible to this pin.

EP (GND)

N/A

Exposed Pad (Ground). The LFCSP has an exposed pad that must be connected to GND

for electrical reasons and soldered to a metal plate on the PCB for mechanical reasons. A

4 × 4 array of thermal vias beneath the exposed GND pad is also recommended.

Other Pins

2, 3, 8, 11, 25, 26, 31, 34

DNC

N/A

Do Not Connect. These pins must be left open circuit.

1 Where a pin is shared between a functional signal and a hardware configuration pin signal, the hardware configuration pin signal is listed last.

2 PU is pull-up, and PD is pull-down. The internal pull-up or pull-down resistor is predefined and nonconfigurable. N/A means not applicable.

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