UJA1065 datasheet(21/76 Pages) NXP

Part #	UJA1065

Description	High-speed CAN/LIN fail-safe system basis chip

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Manufacturer	NXP [NXP Semiconductors]

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UJA1065_7

Product data sheet

Rev. 07 — 25 February 2010

21 of 76

NXP Semiconductors

UJA1065

High-speed CAN/LIN fail-safe system basis chip

When leaving Active mode the CAN transmitter is disabled and the CAN receiver is

monitoring the CAN-bus for a valid wake-up. The CAN termination is then working

autonomously.

6.7.1.2

On-line mode

In On-line mode the CAN-bus pins and pin SPLIT (if enabled) are biased to the normal

levels. The CAN transmitter is deactivated and RXDC reflects the CAN wake-up status. A

CAN wake-up event is signalled to the microcontroller by clearing RXDC.

If the bus stays continuously dominant or recessive for the Off-line time (toff-line), the

Off-line state will be entered.

6.7.1.3

On-line Listen mode

On-line Listen mode behaves similar to On-line mode, but all activity on the CAN-bus, with

exception of a special global wake-up request, is ignored. The global wake-up request is

described in Section 6.7.2. Pin RXDC is kept HIGH.

6.7.1.4

Off-line mode

Off-line mode is the low-power mode of the CAN transceiver. The CAN transceiver is

disabled to save supply current and is high-ohmic terminated to ground.

The CAN off-line time is programmable in two steps with the CAN Off-line Timer Control

(COTC) bit. When entering On-line (Listen) mode from Off-line mode the CAN off-line time

is temporarily extended to toff-line(ext).

6.7.2 CAN wake-up

To wake-up the UJA1065 via CAN it has to be distinguished between a conventional

wake-up and a global wake-up in case partial networking is enabled (bit CPNC = 1).

To pass the wake-up filter for a conventional wake-up a dominant, recessive, dominant,

recessive signal on the CAN-bus is needed; see Figure 9.

For a global wake-up out of On-line Listen mode two distinct CAN data patterns are

required:

• In the initial message: C6 - EE - EE - EE - EE - EE - EE - EF (hexadecimal values)

• In the global wake-up message: C6 - EE - EE - EE - EE - EE - EE - 37 (hexadecimal

values)

The second pattern must be received within ttimeout after receiving the first pattern. Any

CAN-ID can be used with these data patterns.

If the CAN transceiver enters On-line Listen mode directly from Off-line mode the global

wake-up message is sufficient to wake-up the SBC. This pattern must be received within

ttimeout after entering On-line Listen mode. Should ttimeout elapse before receiving the

global wake-up message, then both messages are required for a CAN wake-up.

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