UM0900 datasheet(21/43 Pages) STMICROELECTRONICS

21 / 43 page

UM0900

Board description

Doc ID 17028 Rev 1

21/43

Figure 11.

Six-step current sensing configuration

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 W2 jumper must be connected and the W5

jumper disconnected. The W12 jumper set in position A allows to supply any connected hall

sensor with the same supply voltage of MCU (+3.3 VDC or +5 VDC depend on the W1

jumper). Setting the W12 jumper to position B supplies the hall sensor directly with +5 VDC,

which is the most common voltage for a hall sensor. As a voltage level shifter between +5

VDC hall sensor and +3.3 VDC, control logic uses features built around the U9 Hex Schmitt

inverter. In the case of using a tachometer, the W2 jumper must be disconnected and the

W5 jumper connected.

This type of adjustable feature allows for the testing and evaluating of motors with a wide

spectrum of various sensors.

Table 1.

Current reading configuration - gain settings

Jumper

Gain configuration

Six-step current sensing

Three-shunt

W11

Not present

Present

B position

A position

UM0900 数据表(PDF) 21 Page - STMicroelectronics