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UJA1065 Datasheet(PDF) 21 Page - NXP Semiconductors |
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UJA1065 Datasheet(HTML) 21 Page - NXP Semiconductors |
21 / 76 page UJA1065_7 © NXP B.V. 2010. All rights reserved. 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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