ST7MC1K2 datasheet(189/371 Pages) STMICROELECTRONICS

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On-chip peripherals

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10.6.6

Input detection block

This block can operate in position sensor mode, in sensorless mode or in speed sensor

mode. The mode is selected via the SR bit in the MCRA register and the TES[1:0] bits in

MPAR register (refer to Table 93 for set-up information). The block diagram is shown in

Figure 79 for the position sensor/sensorless modes (TES[1:0 = 00) and in Figure 89 for the

speed sensor mode (TES[1:0] = 01, 10, 11).

Input pins

The MCIA, MCIB and MCIC input pins can be used as analog or as digital pins.

●

In sensorless mode, the analog inputs are used to measure the BEMF zero crossing

and to detect the end of demagnetization if required.

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In sensor mode, the analog inputs are used to get the hall sensor information.

●

In speed sensor mode (example, tachogenerator), the inputs are used as digital pins.

When using an AC tachogenerator, a small external circuit may be needed to convert

the incoming signal into a square wave signal which can be treated by the MTC.

Due to the presence of diodes, these pins can permanently support an input current of 5mA.

In sensorless mode, this feature enables the inputs to be connected to each motor phase

through a single resistor.

A multiplexer, programmed by the IS[1:0] bits in the MPHST register selects the input pins

and connects them to the control logic in either sensorless or tachogenerator mode. In

encoder mode, it is mandatory to connect sensor digital outputs to the MCIA and MCIB pins.

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ST7MC1K2 bảng dữ liệu(PDF) 189 Page - STMicroelectronics