UM0723 datasheet(23/48 Pages) STMICROELECTRONICS

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UM0723

Board description

Doc ID 15870 Rev 4

23/48

For six-step configurations it is necessary to set the proper gain by removing the W10

jumper and applying the W11 jumper to the not marked position.

In Table 1 the mentioned setting of gain jumpers, for all possible current reading

configurations, is shown.

3.3.7

The tachometer and Hall/encoder inputs

Both the tachometer and Hall/encoder inputs have been implemented on the board. In the

case of using a Hall or encoder sensor, the W4 jumper must be connected and the W7

jumper disconnected. The W16 jumper set to dash marked “-” position allows to supply any

connected Hall sensor with +5 VDC supply voltage. Setting the W16 jumper to not marked

position supplies the Hall sensor with the same supply voltage as other hardware

peripherals (+3.3 VDC or +5 VDC depend on the W1 jumper). The U11 Hex Schmitt inverter

is used as the voltage level shifter for the connected Hall sensor.

In the case of using a tachometer, the W4 jumper must be disconnected and the W7 jumper

connected.This feature allows to test and evaluate a wide spectrum of various motors.

3.3.8

Temperature feedback and overtemperature protection

Hardware overtemperature protection is implemented on the STEVAL-IHM023V2

demonstration board. This feature fully protects the switches against damage when

temperature on the junction of the switches overruns a defined value. The temperature is

sensed with an NTC resistor placed on the heatsink. The measured signal is fed through the

J5 motor connector to the MCU control unit and can be read with an A/D converter. The

signal is also fed to comparator U8 where it is compared with a 2.5 V reference voltage

which is built around the U9 precision reference Tl431. The output signal of the comparator

U8 is fed to the SD pin of the L6390D drivers to stop the commutation of the connected

motor. With the value of the NTC resistor used equal to 10 k

Ω, and resistor R44 equal to

3.6 k

Ω, the shutdown temperature is around 70 °C.

Figure 14.

NTC placement on the heatsink

Table 1.

Current reading configuration

Jumper

Gain configuration

Six-step current reading

FOC current reading

W10

Not present

Present

W11

Not marked position

“-” position

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