Datasheet

TMC2130 DATASHEET (Rev. 1.09 / 2017-MAY-15) 14
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3.2 Reduced Number of Components
5V Voltage
regulator
+V
M
5VOUT
VSA
4.7µ
VCC
100n
Optional use lower
voltage down to 6V
Figure 3.2 Reduced number of filtering components
The standard application circuit uses RC filtering to de-couple the output of the internal linear
regulator from high frequency ripple caused by digital circuitry supplied by the VCC input. For cost
sensitive applications, the RC-Filtering on VCC can be eliminated. This leads to more noise on 5VOUT
caused by operation of the charge pump and the internal digital circuitry. There is a slight impact on
microstep vibration and chopper noise performance.
3.3 Internal RDSon Sensing
For cost critical or space limited applications, sense resistors can be omitted. For internal current
sensing, a reference current set by a tiny external resistor programs the output current. For calculation
of the reference resistor, refer chapter 10.
Full Bridge A
Full Bridge B
stepper
motor
N
S
OA1
OA2
OB1
OB2
Driver
BRB
BRA
DAC Reference
AIN_IREF
IREF
AIN_IREF
5VOUT
R
REF
Figure 3.3 RDSon based sensing eliminates high current sense resistors