Datasheet

TMC8462 Datasheet • Document Revision V1.5 • 2019-June-21
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5.4.9 Typical Power Supply Chain Using Both Buck Converters
VS
5V. . . 24V
VS, VS1, VIO1, VIO2, VIO3
Adj. buck converter
5V. . . 24V, <VS VS0, VIO1, VIO2, VIO3
3.3V buck converter
3.3V VCCIO
1.8V linear converter
1.8V
VCC_CORE
Figure 27: Typical power supply chain using both buck converters
5.4.10 Status LED Circuit
The TMC8462has 4 status LED outputs. All outputs are supplied from VCCIO (3.3V), and drive a LED with
current limiting resistor to GND. The use of low current LED is recommended to keep supply current low
and to stay within the current limit of 10mA per pin. The appropriate resistor value must be chosen for the
selected LED’s forward voltage.
For a 2V forward voltage at 2mA, a value of 680 Ohm is a reasonable value.
The LED colors are defined by ETG.1300 (available on www.ethercat.org).
TMC8462 LED outputs
LED_RUN
680 Ω
LED_ERR
680 Ω
LINK_ACT0
680 Ω
LINK_ACT1
680 Ω
Figure 28: Status LED circuit
5.4.11 SII EEPROM Circuit
An I
2
C EEPROM is required for operation with the SII interface. Its size can be up to 4MBit. While the
access protocol of the I
2
C EEPROMs is standardized, the addressing procedure changes from one address
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