UM1692 datasheet(14/42 Pages) STMICROELECTRONICS

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General description

UM1692

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DocID025487 Rev 2

The target phase current is set through the TVAL registers. The TVAL determinates the

current corresponding to the peak of the sine wave (microstepping operation).

4.2.3

Overcurrent detection

The overcurrent protection detection is implemented by measuring the current flowing into

each integrated MOSFET.

The overcurrent protection threshold should be set just above the current rating of the

motor:

IOCDth > Imax,r.m.s. × √2

For example: if the maximum phase current of the motor is 2 Ar.m.s., the overcurrent

protection should be set to about 3 A.

Warning:

Important - it is strongly discouraged to disable the

overcurrent shutdown. It may result in critical failures.

4.2.4

Speed profile

The max. speed parameter is the maximum speed the motor will run. By default, it is about

1000 step/s. That means, if you send a command to run at 2000 step/s, the motor speed is

limited at 1000 step/s.

This is an important safety feature in the final application, but not necessarily useful to

evaluate the device performances. Setting the parameter to high values (e.g. 6000 step/s)

allows evaluating the maximum speed which can be achieved by the application under test

through the speed tracking command (Run), but it probably limits the possibility to use

positioning commands (“Move”, “GoTo”, etc.).

The “Full step” speed parameter indicates the speed at which the system switches from

microstepping to full step operation.

4.3

STM32F105RB microcontroller

The STM32F105xx incorporates the high-performance ARM®Cortex™-M3 32-bit RISC core

operating at a 72 MHz frequency, high-speed embedded memories (Flash memory up to

256 Kbytes and SRAM 64 Kbytes), and an extensive range of enhanced I/O and peripherals

connected to two APB buses. All devices offer two 12-bit ADCs, four general-purpose 16-bit

timers plus a PWM timer, as well as standard and advanced communication interfaces: up

to two I2Cs, three SPIs, two I2Ss, five USARTs, a USB OTG FS and two CANs.

The STM32F105xx operates in the -40 to +105 °C temperature range, from a 2.0 to 3.6 V

power supply. A comprehensive set of power-saving mode allows the design of low-power

applications.

The STM32F105xx offers devices in three different package types: from 64 pins to 100 pins.

Depending on the device chosen, different sets of peripherals are included.

These features make the STM32F105xx and STM32F107xx connectivity line

microcontroller family suitable for a wide range of applications such as motor drives and

application control, medical and handheld equipment, industrial applications, PLCs,

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