AN4373 datasheet(9/14 Pages) STMICROELECTRONICS

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DocID025365 Rev 1

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AN4373

Board description

Figure 6. STEVAL-IFP015V2 bottom layer

2.1

Power section

This device, due to internal galvanic isolation, has two ground references, GNDDD for VDD

digital supply and GNDCC for VCC main supply. Both supply voltages has reverse polarity

protection implemented with the STPS1L60A diode on VDD and with STPS1H100A diode on

VCC main voltage.

The operating supply values are variable within a range of 10.5 V - 3.3 V for VCC supply, and

a range of 3.1 V to 5.5 V for VDD. This latter reference can be selected using three way drop

jumper J1

Note:

The “5 V” and “3.3 V” labels identify connection with a 30 pin connector and the possibility to

power the device by microcontroller board, whereas the “EXT” label identifies connection

with screw connector.

A bidirectional transil diode SM15T33CA, connected on the VCC supply improves EMC

stress robustness; while capacitors C4 and C5 realize a coupling network in case of EMC

common mode test.

2.2

Digital interface

The STEVAL-IFP015V2 microcontroller interface permits device driving in:

Direct Mode: for instantaneous output control

Synchronous Mode: for triggered outputs control. This mode is useful if a lower delay of

all outputs is needed

Both modalities are managed by modifying the default state of the Sync and Load signals.

By default they are pulled up by the two signal LEDs D2 and D3. Pulling down these two

signals at the same time, Direct Mode is active, so it is sufficient to change the input state to

change the corresponding output as well.

AN4373 Datasheet(PDF) 9 Page - STMicroelectronics