TMC4671 Datasheet • IC Version V1.00 | Document Revision V1.04 • 2018-Dec-11
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10 Sample Circuits
Please consider electrical characteristics while designing electrical circuitry. Most Sample Circuits in this
chapter were taken from the Evalutation board for the TMC4671 (TMC4671-EVAL).
10.1 Supply Pins
Please provide VCCIO and V5 to the TMC4671. VCC_CORE is internally generated and needs just an external
decoupling capacitor. Place one 100nF decoupling capacitor at every supply pin. Table 26 lists additional
needed decoupling capacitors.
Pin Name Supply Voltage Additional Cap.
V5
5V
4.7uF
4.7uF & 470nF
none
VCCIO
VCCCORE
3.3V
1.8V
Table 26: Additional decoupling capacitors for supply voltages
10.2 Clock and Reset Circuitry
The TMC4671 needs an external oscillator for correct operation at 25 MHz. Lower frequency results in
respective scaling of timings. Higher frequency is not supported. The internally generated active low
reset can be externally overwritten. If users want to toggle the reset, a pulse length of at least 500 ns is
recommended. When not used, please apply a 10k Pull up resistor and make sure all supply voltages are
stable.
10.3 Digital Encoder, Hall Sensor Interface and Reference Switches
Digital encoders, Hall sensors and reference switches usually operate on a supply voltage of 5V. As the
TMC4671 is usually operated at a VCCIO Voltage of 3.3V, a protection circuit for the TMC4671 input pin is
needed. In fig. 35 a sample circuit for the ENC_A signal is shown, which can be reused for all encoder and
Hall signals as well as for reference switch signals. Parametrization of the components is given in table 27
for different operations.
Figure 35: Sample Circuit for Interfacing of an Encoder Signal
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