ST72141K2 datasheet(45/132 Pages) STMICROELECTRONICS

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ST72141K

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MOTOR CONTROLLER (Cont’d)

Input Pins

The MCIA, MCIB and MCIC input pins can be

used as analog pins in Sensorless mode or as dig-

ital pins in Sensor mode. In sensorless mode, the

analog inputs are used to measure the BEMF zero

crossing and to detect the end of demagnetization

if required. In Sensor mode, they are connected to

sensor outputs.

Due to the presence of diodes, these pins can per-

manently support an input current of 5 mA. In Sen-

sorless mode, this feature enables the inputs to be

connected to each motor phase through a single

resistor.

Note: In high voltage applications, in Sensorless

mode and for certain motors and power topologies

(with parasitic capacitance or other), it may be re-

quired to add external pull-up Schottky 0.4 V (e.g.

BAT48) diodes on the MCIA, MCIB and MCIC

pins.

A multiplexer, programmed by the IS[1:0] bits in

MPHST register selects the input pins and con-

nects them to the rotor position control logic in ei-

ther Sensorless or Sensor mode.

Figure 29. Input Stage

VREF

Inputn Sel Reg

VR[1:0]

MCIC

MCIA

MCIB

IS[1:0]

External Input Block

Input Comparator Block

Event Detection

ZVD bit

HDMn bit*

SR bit

µs / D

µs / C

CPBn bit*

REO bit

DS,H

CPBn bit*

16-bit Timer PWM

Sampling frequency

V0C1 bit

Freq (T=1.25

µs) for demagnetization and sensors

Sample

DS,H

* = Preload register,

MPHST Register

MPAR Register

MCRA Register

MCRB Register MPAR Register

MCRB Register

MCRA Register

MCRB Register

Reg

DS,H

events:

Commutation

BEFM Zero-crossing

End Of Demagnetization

Emergency Stop

Notes:

Updated/Shifted on R

Ratio Updated (+1 or -1)

Multiplier Overflow

R+/-

Current Mode

Voltage Mode

Regn

Updated with Regn+1 on C

Branch taken after C event

Branch taken after D event

changes taken into

account at next C event.

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