TMC8461 Datasheet • Document Revision V1.4 • 2018-Oct-05
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Single Supply Operation TMC8461 is designed to work with a single external power supply rail. All
required supply voltages are generated internally. The required external supply rail depends on the
application scenario (between 3.3V and 24V).
3.5 Interfaces
ESC Process Data Interface The ESC part can be accessed via the so-called Process Data Interface (PDI).
TMC8461 comes with an SPI PDI. Besides the standard SPI bus lines additional control signals belong to
the SPI PDI, which are further described in Section 5.1..
MFC IO Control Interface The MFC IO block of TMC8461 can be accessed from EtherCAT master side
or from the local application controller. For connection to the local application controller, a second SPI
interface – the MFC IO SPI – is provided. The protocol used nearly identical to the SPI PDI interface.
Additional information on the MFC IO SPI is given in Section 5.2.
Ethernet PHY Connection TMC8461 provides 2 communication ports and connects to 100Mbit Ethernet
PHYs via MII running at 25MHz.
In addition, each PHY can be connected to the PHY Management Interface (MI) for functions like link state
detection when not using dedicated LINK signals.
EEPROM Interface The EEPROM interface is intended to be a point-to-point interface between TMC8461
and EEPROM with TMC8461 being the master. If other I2C masters are required to access the I2C bus,
TMC8461 must be held in reset state, for example for in-circuit-programming of the EEPROM. During
operation, the application controller must tristate its I2C interface. Depending on the EEPROM size the
addressing mode must be properly set using the PROM_SIZE configuration pin.
Configuration Inputs Hard-wired configuration pins are available at the TMC8461, which are used to
configure various options related to the hardware configuration and application scenario and which will not
change. These pins are PROM_SIZE, MII_TX_SHIFT[x], PHY_OFFSET, LINK_POLARITY, PDI_SHARED_SPI_BUS,
and DEVICE_EMULATION.
More information on these configuration pins and signals is given in Section 4.2 and Section 5.
3.6 Software- and Tool-Support
TRINAMIC’s EtherCAT Slave Controller family comes with extensive hardware and software tool support to
get started quickly.
Evaluation Board An evaluation board is available for the TMC8461. The evaluation board comes with
on-board 100-Mbit Ethernet PHYs and standard RJ45 connectors and transformers for interfacing twisted
pair copper (TPC) media.
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