Datasheet TMC7300 (TRINAMIC) - 6
| Hersteller | TRINAMIC |
| Beschreibung | POWER DRIVER FOR DC MOTORS. Low Voltage Driver for One or Two DC Motors up to 2A (2.4A) peak – UART based Control for Torque and Velocity. 4 Half Bridge Peripheral Driver Option |
| Seiten / Seite | 43 / 6 — 1.2 Moving and Controlling the Motor. UART. 1.2.1 PWM control. 1.2.2 … |
| Dateiformat / Größe | PDF / 1.1 Mb |
| Dokumentensprache | Englisch |
1.2 Moving and Controlling the Motor. UART. 1.2.1 PWM control. 1.2.2 Internal Current Limiter. 1.3 Mechanical Load Sensing
Modelllinie für dieses Datenblatt
Textversion des Dokuments
TMC7300 DATASHEET (Rev. 1.01 / 2019-NOV-06) 6 together all interface pins, in case no read access is required. An optional addressing can be provided by analog multiplexers, like 74HC4066. From a software point of view the TMC7300 is a peripheral with a number of control and status registers. Most of them can either be written only or are read only. Some of the registers allow both, read and write access. In case read-modify-write access is desired for a write only register, a shadow register can be realized in master software.
1.2 Moving and Controlling the Motor UART 1.2.1 PWM control
The motor is operated by an internal PWM generator. The PWM acts like a dedicated voltage source for the motor. E.g. a 50% duty cycle will let the motor turn like with 50% of the supply voltage. A negated duty cycle will turn the motor in the opposite direction. This way, direction and velocity can be controlled like with a programmable power source. By slowly increasing / decreasing the duty cycle, the motor can be softly accelerated and decelerated.
1.2.2 Internal Current Limiter
When a DC-motor is mechanical loaded, its current increases. Therefore, a current limit allows limitation of motor torque. At the same time, the power source, e.g. a dual AA battery with a certain internal resistance is protected against voltage drop due to overload. This feature especially is helpful when moving the motor to a mechanical obstacle. The action of the current limiter can be read back via the interface.
1.3 Mechanical Load Sensing UART
When a DC-motor is mechanical loaded, its current increases. Therefore, a current limit allows limitation of motor torque. The TMC7300 reports back, when this load limit is achieved. This feature especially is helpful when moving the motor to a mechanical obstacle.
1.4 Protection and Diagnostics
By adapting the sense resistor to the desired maximum current, a sensitive protection of the respective half bridge is reached. In case the voltage drop across the sense resistor plus internal Power MOSFET exceeds roughly 1V, the power stage becomes disabled and the error is reported via the interface, or via the DIAG output. www.trinamic.com
1.2 Moving and Controlling the Motor UART 1.2.1 PWM control
The motor is operated by an internal PWM generator. The PWM acts like a dedicated voltage source for the motor. E.g. a 50% duty cycle will let the motor turn like with 50% of the supply voltage. A negated duty cycle will turn the motor in the opposite direction. This way, direction and velocity can be controlled like with a programmable power source. By slowly increasing / decreasing the duty cycle, the motor can be softly accelerated and decelerated.
1.2.2 Internal Current Limiter
When a DC-motor is mechanical loaded, its current increases. Therefore, a current limit allows limitation of motor torque. At the same time, the power source, e.g. a dual AA battery with a certain internal resistance is protected against voltage drop due to overload. This feature especially is helpful when moving the motor to a mechanical obstacle. The action of the current limiter can be read back via the interface.
1.3 Mechanical Load Sensing UART
When a DC-motor is mechanical loaded, its current increases. Therefore, a current limit allows limitation of motor torque. The TMC7300 reports back, when this load limit is achieved. This feature especially is helpful when moving the motor to a mechanical obstacle.
1.4 Protection and Diagnostics
By adapting the sense resistor to the desired maximum current, a sensitive protection of the respective half bridge is reached. In case the voltage drop across the sense resistor plus internal Power MOSFET exceeds roughly 1V, the power stage becomes disabled and the error is reported via the interface, or via the DIAG output. www.trinamic.com