Datasheet

TMC2300 DATASHEET (Rev. 1.02 / 2019-NOV-06) 14
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3.4 Low Power Standby
Battery powered applications, as well as mains powered applications conforming to EU energy saving
regulations, often require a standby mode, where the power-supply remains on. Current consumption
in this mode must be minimized. Control near zero power TMC2300 standby operation by switching
off the I/O supply voltage on VIO_NSTDBY pin. At the same time make sure, that no digital input pin
is at a high level. An input level above VIO_NSTDBY would hinder pulling down VIO_NSTDBY, due to
the ESD protection diodes in each digital I/O pin. These diodes clamp each input to a level between
GND and the IO supply voltage VIO_NSTDBY. Therefore, stop the motor first, and allow sufficient time
for the motor to come to a standstill, pull the enable input EN low, and also all other input pins, to
switch off the motor completely before switching off VIO voltage. All driver registers are reset to their
power-up defaults after leaving standby mode. See Figure 3.4.
ready
driver power updriver standbymotion with nominal motor current stand still current ramp down
hold current driver disable
+IMAX
-IMAX
0
EN
VIO_NSTDBY
Actual Power Draw
<1µA
Standstill
Operation
Motor Current
(one phase shown)
Set by IRUN
<3mA
0
0
+VIO
+VIO
up to
0.5ms
Inputs
Phase of Operation
Set by IHOLD
Set by TPOWERDOWN
Set by IHOLDDELAY
Motor driver disabled
Low current standby
Ready to move, prepare
configuration for motor
restart before Enable
Motion stop
Figure 3.4 Switching to Standby and Back On