Datasheet TMC7300 (TRINAMIC) - 10

link to page 28 TMC7300 DATASHEET (Rev. 1.01 / 2019-NOV-06) 10
3 Sample Circuits
The sample circuits show the connection of external components in different operation and supply modes. The connection of the bus interface and further digital signals is left out for clarity. The TMC7300 is configured for different application modes by two pins, as well as by settings available via the UART interface.
3.1 DC Motor Operation
Place near IC with Optional external short path to die pad capacitor T 100n 1n-100n OU 10V P 8V C 1. V
+VM
VS TMC7300 A2 Or low ESR 100µF 100n 1.8V Voltage Internal charge 10µ electrolytic / depending A1 on supply resistance regulator STANDBY pump and motor current OA1
M
Full Bridge A OA2 AD0 UART Address AD1 BRA RSA Configuration Configuration DC motor PWM (GND or VIO) ENUART Interface BRA Connect directly MODE B. Dwersteg, © to GND plane BRB TRINAMIC 2016 Current UART interface UART UART interface regulator Use low inductivity SMD + Register Block type for RSA and RSB DIAG Programmable OB1 Driver error Diagnostic
M
Output Full Bridge B OB2 VIO/ 1.8V to 5V NSTDBY I/O voltage Standby STANDBY detector / standby 100n BRB RSB 500k CLK oscillator Connect directly to GND plane EN D AD N G PEID driver enable (disable prior to configuration!)
Figure 3.1 Operation of two DC-Motors for 1.8V to 11V supply
The standard application circuit uses a minimum set of additional components to operate one or two DC motors. Each one sense resistor sets the motor current limit. See chapter 7 to choose the right sense resistor value. Take care to keep power supply ripple due to chopper operation at a few 100mV, max., especially when low voltage operation is desired. Use ceramic, or low ESR capacitors for filtering the power supply. The capacitors need to cope with the current ripple caused by chopper operation. A minimum capacity of 100µF electrolytic, or a 10µF ceramic capacitor near the driver is recommended to keep ripple low. Actual demand will depend on the internal power supply resistance and the desired motor current. VCC_IO can be supplied from a separate supply, e.g. a 3.3V regulator, or be driven by a microcontroller port pin. AD0 and AD1 set the UART address. Ensure, that the EN pin is driven by the microcontroller in order to disable the motor prior to initialization! Apply a pulldown resistor for EN to keep it low during power-up. Basic layout and component hints Place sense resistors and all filter capacitors as close as possible to the related IC pins. Use a solid common GND for all GND connections, also for sense resistor GND. Connect 1.8VOUT filtering capacitor directly to 1.8VOUT and the GND pin. See layout hints for more details. Low ESR electrolytic capacitors are recommended for VS filtering unless supply resistance is very low. Attention Power up with EN-pin low. Set GCONF.pwm_direct prior to enabling the driver via EN-pin. Otherwise the motor will run directly after power-up. www.trinamic.com