Datasheet

TMC8460-BI Datasheet (V100 / 2016-Sep-01)

To reduce overall number of signals on the PCB or if the local application controller has only one SPI

interface, the MFC CTRL SPI bus can use the SPI bus signals of the PDI SPI. Therefore, both interfaces

are internally switched on the PDI SPI interface. The original MFC CTRL SPI signals (MOSI, MISO, and

SCK) remain unconnected in this case. Only the

MFC_CTRL_SPI_CSN pin/signal must be used if the

MFCIO block should be accessed.

To share the SPI bus lines, configuration pin PDI_SHARED_SPI_BUS must be pulled high as

shown in the figure below.

PDI SPI

PDI_SHARED_SPI_BUS

SPI BUS

MUX

MFC CTRL SPI

3V3

MISO, MOSI, SCK, CSN

PDI SPI

MFC_CTRL_SPI_CSN

MFC CTRL SPI

MISO, MOSI, SCK

TMC8460

MISO, MOSI, SCK, CSN

Figure 18 - Shared SPI bus configuration

3.7 EEPROM Interface

The TMC8460 contains an I2C master interface with PROM_CLK and PROM_DATA. Both PROM_CLK and

PROM_DATA require an external pull-up (4.7 kΩ recommended).

Both 1 byte and 2 byte addressed EEPROMs are supported. The EEPROM size is configurable using the

PROM_SIZE pin (

0 = up to 16K EEPROM, 1 = 32 kbit-4Mbit EEPROM).

The output signal EEPROM_OK indicates that the EEPROM content has been successfully loaded.

The EEPROM interface is intended to be a point-to-point interface between TMC8460 and I2C EEPROM.

If other I2C masters are required to access the EEPROM using the same I2C bus, the TMC8460 must be

in reset state. A typical use case is to (re)program the EEPROM on the board using the application

controller.

PROM_DATA

TMC8460

PROM_CLK

PROM_SIZE

EEPROM_OK

Figure 19 - EEPROM Interface signals