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TMC248-LA Datasheet(PDF) 5 Page - TRINAMIC Motion Control GmbH & Co. KG. |
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TMC248-LA Datasheet(HTML) 5 Page - TRINAMIC Motion Control GmbH & Co. KG. |
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5 / 40 page  TMC248-LA DATASHEET (Rev. 1.01 / 2013-MAR-26) 5 www.trinamic.com 1.1 Advanced Features stallGuard™ The TMC248 offers sensorless load measurement and stall detection. Its ability to predict an overload makes the TMC248 an optimum choice for drives, where a high reliability is desired. Further, the integrated stallGuard™ feature makes the TMC248 a good choice for applications, where a reference point is needed, but where a switch is not desired. Current Control Current control serves a cool driver and motor. Internal DACs allow microstepping as well as smart current control. Its low power dissipation makes the TMC248 an optimum choice for drives, where a high reliability is desired. Microstepping via SPI Easy to use digital control of microstepping. After choosing the desired microstep resolution the microcontroller sends digital values for each microstep current via SPI. DACs and comparators convert these digital values to analog signals for coil currents. This way, every microstep is initialized and controlled by the microcontroller. The TMC248 serves for the execution. Mixed Decay Mixed decay can be used for smoother operation. Low Noise Chopper The TMC248 allows implementing a low noise voltage PWM chopper by two microcontroller PWM outputs using its simple standalone mode. This way, a motor can be moved very smoothly at high microstep resolution without any noise. Slope Control Slope control reduces electromagnetic emissions. Oscillator and Clock Selector Oscillator and clock selector provide the system clock from the on- chip oscillator or an external source. 1.2 Control Interfaces There are two control interfaces from the motion controller to the motor driver: the SPI serial interface and the classical analog interface. 1.2.1 SPI Interface The SPI interface is used to write control information to the chip and read back status information. This interface must be used to initialize parameters and modes necessary to enable driving the motor. This interface may also be used for directly setting the currents flowing through the motor coils. The motor can be controlled through the SPI interface alone. The SPI interface is a bit-serial interface synchronous to a bus clock. For every bit sent from the bus master to the bus slave, another bit is sent simultaneously from the slave to the master. Communication between an SPI master and the TMC248 slave always consists of sending one 12-bit command word and receiving one 12-bit status word. The SPI command rate typically corresponds to the microstep rate at low velocities. At high velocities, the rate may be limited by CPU bandwidth to 10,000 to 100,000 commands per second, so the application may need to change to fullstep resolution. 1.2.2 Classical Non-SPI Control Mode (Standalone Mode) The driver can be controlled by analog current control signals and digital phase signals. |
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