UM0842 datasheet(11/50 Pages) STMICROELECTRONICS

11 / 50 page

UM0842

Configuration

Doc ID 16542 Rev 4

11/50

For the two Ethernet PHYs (U5 and U6 in MII mode) to function correctly, it is necessary to

clock them using a 25-MHz clock. There are two ways to deliver the 25-MHz clock signal to

the devices.

5.2

Digital input / digital output connectors

The digital input and digital output connectors are used to extend the EVALSPEAR320PLC

board with the industrial input and output cards.

The input sensors (for example, proximity switches) of the controlled industrial process are

normally decoupled and connected by the current limiters based on the CLT and SCLT

devices of the microcontroller. The digital outputs, also electrically decoupled, are based on

high-side drivers which are used in industrial environments to switch industrial loads (valves,

relays, …) and process control. For both the inputs and outputs, we can use either serial

(SPI) or parallel (GPIO) IN/OUT cards.

The EVALSPEAR320PLC board is compatible with the following cards:

Digital input serial (CN3): STEVAL-IFP007V1

Digital output serial (CN4): STEVAL-IFP009V1

Digital input parallel (CN5): STEVAL-IFP004V1 and STEVAL-IFP008V1

Digital output parallel (CN6): STEVAL-IFP002V1, STEVAL-IFP001V1 and STEVAL-

IFP006V1

Figure 5.

EVALSPEAR320PLC board with digital input and digital output cards

MII1_MDC, MII1_MDIO used for both PHYs (U5, U6)

R93, R94, R27, R29 loaded

R95, R96 not loaded

MII2_MDC, MII2_MDIO used for both PHYs (U5, U6)

R95, R96, R27, R29 loaded

R93, R94 not loaded

Table 3.

SMI interface configuration (continued)

Function

Default configuration

Digital input

(current limiters)

EVALSPEAR320PLC

board

Controlled

process

Digital output

(high side drivers)

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