TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
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byte up to 16kBit to two address bytes from 32kBit. Up to 16kBit the PROM_SIZE pin must be tied to GND,
above that, it must be tied to VCCIO (3.3V).
3.3V
3.3V
3.3V
SII EEPROM
VCC
1k Ω
1k Ω
TMC8462 SII EEPROM signals
WP
PROM_SIZE
PROM_CLK
GND or 3.3V
Signal to uC
SCL
SDA
A2
A1
100nF
A0
PROM_INIT
PROM_DATA
GND
Figure 29: SII EEPROM circuit (shown for EEPROMs >32kBit)
5.4.12 Considerations on PHY to PHY Connection
In applications with multiple EtherCAT slave controllers in one enclosed device or even on the same PCB, it
is not always necessary to connect the slave controllers via magnetics, RJ-45 connectors (or similar) and a
patch cable. Instead a direct backbone connection or traces on the PCB can be used to directly link the
PHYs, however coupling capacitors must be used in the connection.
This option reduces the cost as well as the required space in the setup.
Note
This connection method should be used only over short distances with no or few
connectors in between. It is not recommended for longer distances, especially
using a wired connection.
TMC8462 #1 OUT port
TMC8462 #2 IN port
TX+
TX+
TX-
TX-
RX+
RX-
RX+
RX-
all capacitors 33nF
Figure 30: Direct PHY to PHY connection
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