UM0428

Board architecture

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In the three-shunt configuration, the amplification is positive and an offset is added to keep

the negative values of the current in the range of ADC also. The levels of the amplified

signals are compatible with 3.3 V microcontrollers.

5

To use the ICS, the operational amplifiers U1 network must be modified according to sensor

characteristics. For example using the LTSR 6-NP having Vo=2.5 V + 0.625*I/6 A, the

following steps are required:

–

remove R1, R32, R52

–

short circuit R21, R22, R44, R45, R65, R66

–

replace R4, R28, R54, with 330

Ω

–

replace R15, R35, R55 with 680

Ω

The BEMF conditioning network can be configured to use internal or external comparators.

For the ST7MC control board STEVAL-IHM010V1 internal comparators should be used.

The board is featured with a conditioning network for the following kinds of sensors:

●

Hall sensors (three inputs H1, H2, H3)

●

Encoder (one sensor with three inputs A+, B+, Z+)

●

Tachometer sensor (one sensor)

Figure 5 shows the power board layout and the relative connectors.

Figure 5.

Power board layout

5.1

MC Connector

The 34-pin MC connector has been designed as the standard to connect the control board

to the power board. Following the configuration of the MC connector, it is possible to design

a different control board or a power board preserving the compatibility between the two