Datasheet

TMC5062 DATASHEET (Rev. 1.11 / 2017-MAY-16) 13
www.trinamic.com
3.1.1 VCC_IO Requirements
For a reliable start-up it is essential that VCC_IO comes up to a minimum of 1.5V before the TMC5062
leaves the reset condition. The reset condition ends earliest 50µs after the time when VSA exceeds its
undervoltage threshold of typically 4.2V, or when 5VOUT exceeds its undervoltage threshold of
typically 3.5V, whichever comes last.
THERE ARE THREE WAYS TO COME UP TO VCC_IO REQUIREMENTS
- 5VOUT can be used directly to supply VCC_IO. In this case there are no further requirements.
- An external low drop regulator can be used in a 3.3V environment. Note, that most voltage
regulators are not suitable for this application because they show a delayed boot up. The
following external regulators are proven by TRINAMIC:
TS3480CX33
This regulator can be used within the full supply voltage range when tied
to the motor supply voltage.
LD1117-3.3
This regulator can be used to supply VCC_IO from 5VOUT, or from a supply
voltage of up to 15V.
- VCC_IO can be supplied externally as shown in Figure 3.2 . In this case it is mandatory to
connect the Schottky diode to the logic supply of the external circuitry. Please note, that the
2K resistor is not to be used with 5V I/O voltage.
5V Voltage
regulator
charge pump
VCP
22n
100n
+V
M
5VOUT
VSA
4.7µ
VCC
100n
470n
CPI
CPO
VCC_IO
2R2
22n
+VCC_IO
MSS1P3
1K
2K
3.3V, only
Figure 3.2 External supply of VCC_IO (showing optional filtering for VCC)
Refer to application note no. 028 Supply Voltage Considerations: VCC_IO in TMC50xx Designs
(www.trinamic.com). Here you will find complete information about connecting VCC_IO.