TJA1102_SDS All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2017. All rights reserved.
Product short data sheet Rev. 1 — 1 November 2017 11 of 19
NXP Semiconductors
TJA1102
100BASE-T1 Dual PHY for Automotive Ethernet
The wake-up behavior of the PHYs can be configured individually. This arrangement
allows WAKE_IN_OUT to be used as a local wake-up or to have a mixed system with only
some ports forwarding a wake-up request. The following configuration options are
available and are selected via the SMI Configuration register 1:
REMWUPHY determines whether a PHY reacts to a remote wake-up request.
FWDPHYREM determines whether a PHY forwards a wake-up request (from another
port or via WAKE_IN_OUT) to its MDI. A WUP or WUR is sent, depending on the link
status.
LOCWUPHY determines whether a PHY should be woken up in response to a local
wake-up event (forwarded from another port or via WAKE_IN_OUT)
FWDPHYLOC determines whether wake-up event should be forwarded to other ports
(i.e. should the second PHY be informed and/or the WAKE_IN_OUT signal activated).
The WAKE_IN_OUT signal features a programmable timeout to enable it to support a
number of wake-up concepts (e.g. wake-up line). It reacts on a rising edge.
6. Application information
The MDI circuit used for each PHY port is shown in Figure 9. The common mode
termination depends on OEM requirements and might vary, depending on the application.
The common mode choke is expected to be compliant with the OPEN Alliance CMC
specification. The 100 nF coupling capacitors should have a voltage range 50 V with
10 % (max) tolerance.
Fig 8. Wake request forwarding
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