TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
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5 Device Usage and Handling
5.1 Process Data Interface
The Process Data Interface (PDI) is an SPI interface with a clock frequency of up to 30 MHz. The ESC
registers and the process data RAM can be accessed from an external microcontroller using this interface.
The interface can be configured via the EEPROM, however it is recommended to use the default config-
uration (SPI mode 3 with low active chip select). For further details, see the ESC SPI slave configuration
registers in Section 6.
Additionally, some signals are available that can be evaluated by the application controller.
Figure 8: PDI control signals
TMC8462 pin
PDI_SPI_CSN
PDI_SPI_SCK
PDI_SPI_MOSI
PDI_SPI_MISO
PDI_SPI_IRQ
Description
Typical pin on a MCU
SPI chip select for the TMC8462 PDI
SPI master clock
SSx
SCK
Master out slave in data
Master in slave out data
Configurable IRQ from PDI
MOSI
MISO
General purpose Input
PDI_EMULATION
0: default mode for complex slaves, state
machine changes processed in microcontroller
firmware (SSC); 1: device emulation mode for,
e.g., simple slaves, state machine changes
directly handled in the ESC
General purpose Output
or connected to either
ground or 3.3V.
PDI_SOF
Indicates start of an Ethernet/EtherCAT frame
(MII_RXDV = ’1’)
General purpose Input
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