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UJA1076 Datasheet(PDF) 22 Page - NXP Semiconductors |
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UJA1076 Datasheet(HTML) 22 Page - NXP Semiconductors |
22 / 47 page UJA1076_2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 02 — 27 May 2010 22 of 47 NXP Semiconductors UJA1076 High-speed CAN core system basis chip 6.7.2 Split circuit Pin SPLIT provides a DC stabilized voltage of 0.5VV2. It is activated in CAN Active mode only. Pin SPLIT is floating in CAN Lowpower and Off modes. The VSPLIT circuit can be used to stabilize the recessive common-mode voltage by connecting pin SPLIT to the center tap of the split termination (see Figure 10). A transceiver in the network that is not supplied and that generates a significant leakage current from the bus lines to ground, can result in a recessive bus voltage of < 0.5VV2. In this event, the split circuit will stabilize the recessive voltage at 0.5VV2. So a start of transmission will not generate a step in the common-mode signal which would lead to poor ElectroMagnetic Emission (EME) performance. 6.7.3 Fail-safe features 6.7.3.1 TXDC dominant time-out function A TXDC dominant time-out timer is started when pin TXDC is forced LOW. If the LOW state on pin TXDC persists for longer than the TXDC dominant time-out time (tto(dom)TXDC), the transmitter will be disabled, releasing the bus lines to recessive state. This function prevents a hardware and/or software application failure from driving the bus lines to a permanent dominant state (blocking all network communications). The TXDC dominant time-out timer is reset when pin TXDC goes HIGH. The TXDC dominant time-out time also defines the minimum possible bit rate of 10 kbit/s. 6.7.3.2 Pull-up on TXDC pin Pin TXDC has an internal pull-up towards VV1 to ensure a safe defined state in case the pin is left floating. 6.8 Local wake-up input The SBC provides 2 local wake-up pins (WAKE1 and WAKE2). The edge sensitivity (falling, rising or both) of the wake-up pins can be configured independently via the WIC1 and WIC2 bits in the Int_Control register Table 6). These bits can also be used to disable wake-up via the wake-up pins. When wake-up is enabled, a valid wake-up event on either of these pins will cause a wake-up interrupt to be generated in Standby mode or Normal Fig 10. Stabilization circuitry and application using the SPLIT pin UJA1076 V2 CANL SPLIT CANH 60 Ω 60 Ω R R GND VSPLIT = 0.5 VCC in normal mode; otherwise floating 015aaa121 |
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