UM1483 datasheet(14/35 Pages) STMICROELECTRONICS

14 / 35 page

Board description

UM1483

14/35

Doc ID 022398 Rev 1

3.3.2

Input part of the converter

The input stage of the demonstration board is provided with an NTC resistor to eliminate

input inrush current peak during the charging of the bulk capacitors. A fuse for nominal

current 2 A is implemented in series with the resistor.

The complete EMI filter is based on common mode choke, X2 and Y2 capacitors were

implemented on the STEVAL-IHM036V1 demonstration board. The EMI filter was

performing to fulfill the radio disturbance requirements coming from EN55014 (CISPR 14).

The supply input of the inverter is protected with the varistor VR1 against disturbances. The

board is in compliance with surge tests according to IEC 61000-4-5 up to 2 kV and also

with burst immunity according to IEC61000-4-4 up to 2 kV with positive and negative pulses.

3.3.3

Control block with value line STM32 MCU

The control stage of the STEVAL-IHM036V1 board is designed around an

STM32F100C6T6B microcontroller in a 48-pin LQFP package. The STM32F100C6T6B

MCU belongs to the value line medium and low density STM32 MCU family.

The interface between the user and the board, for commands, is based on user button SW1

and the potentiometer R24. Indicated status is based on two LED diodes D11 and D12.

The STM32F100C6T6B microcontroller, present on the board, is intended to be used in

conjunction with the external 8 MHz crystal Y1.

The board could be featured with a non-insulated RS-485 bus. On the PCB an SO-8 foot pin

is prepared, which allows to assemble STMicroelectronics transceiver ST3485ECD. Use of

this feature allows to evaluate the board in applications where serial communication is

required. Due to application intention, the kit is not electrically isolated from the DC input.

This topology is very common in motor drives. The microprocessor and the transceiver are

grounded by the integrated ground of the DC bus. The microprocessor and associated

circuitry are hot and MUST be isolated from user controls and communication interfaces.

The board is not galvanic isolated from the supply mains. As a result of this, make sure to

connect any RS-485 devices to the board which has no galvanic isolated ports. Before

updating the board with such a peripheral, please refer to STMicroelectronics ST3485ECD

datasheet for more information on how to connect I/O.

For development and debugging purposes, the board features a standard 20-pin JTAG

interface connector for connection of debugging/programming tools for ARM core-based

devices.

Table 2 lists the I/O assignments for the STM32F100C6T6B MCU.

Table 1.

Jumper settings single/dual supply mode

Single supply mode

Dual supply mode

SW4 present

SW4 not present

(J1 - input voltage; J5 - aux. voltage)

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