ADIN2111CCPZ-R7 datasheet(35/129 Pages) AD

35 / 129 page

Data Sheet

ADIN2111

APPLICATIONS INFORMATION

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Rev. A | 35 of 129

Figure 15. Supplies and Capacitors for Single-Supply 2.4 V p-p Transmit

Mode

ETHERNET DAISY CHAIN, LINE, AND RING

NETWORK TOPOLOGIES

The ADIN2111 is targeted at building automation and factory auto-

mation applications that deploy 10BASE-T1L in a daisy chain, line,

or ring network topology. These network topologies significantly

reduce the amount of cabling required when compared to a star

network.

The ADIN2111 integrates two 10BASE-T1L PHY and a store and

forward switch to provide a single chip, low power solution for

adding devices to a daisy chain, line, or ring network topology. The

ADIN2111 provides an industry standard SPI for the device connec-

tion. Using SPI eases the requirements for the host processor and

gives the user more choices to optimize a device for power, cost,

and performance.

ADIN1100

CONTROLLER

ADIN2111

SPI HOST

10BASE-T1L LINKS

SPI HOST

Figure 16. Daisy Chain Topology Using ADIN2111

LED CIRCUIT EXAMPLES

The LED_0 and LED_1 pins can be used in various circuit configu-

rations depending on the LED polarity mode defined in the LED

polarity register (LED_POLARITY). The circuits described in the

Active High LED Polarity, Active Low LED Polarity, and Autosense

Polarity sections provide examples for the following three polarity

modes that are available for each LED:

►

Active high

►

Active low

►

Autosense (default)

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

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 the active high configuration, the Px_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 and RPD1) with a

value of 4.7 kΩ are recommended.

Px_LED_1

Px_LED_O

ADIN2111

RPD1

RPD0

VDDIO

RPU

RPD

Figure 17. Active High LED Polarity Configuration

Active Low LED Polarity

In the active low configuration, the Px_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 and RPU1) with a

value of 4.7 kΩ are recommended.

Px_LED_1

Px_LED_O

ADIN2111

VDDIO

RPU1

VDDIO

RPU0

VDDIO

RPU

RPD

Figure 18. Active Low LED Polarity Configuration

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