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TJR1441 Datasheet(PDF) 12 Page - NXP Semiconductors |
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TJR1441 Datasheet(HTML) 12 Page - NXP Semiconductors |
12 / 31 page ![]() NXP Semiconductors TJR1441 High-speed CAN transceiver TJR1441 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved. Product data sheet Rev. 1 — 7 September 2020 12 / 31 are active on these pins in all states; they should be held at the VCC/VIO level in Silent (or Off in TJR1441D) mode to minimize supply current. 7.2.3 Undervoltage detection on pins VCC and VIO If VCC or VIO drops below the undervoltage detection threshold (Vuvd(VCC) or Vuvd(swoff)VCC for VCC; Vuvd(swoff)VIO for VIO) the transceiver switches to Off mode and disengages from the bus (zero load; bus pins high-ohmic) until the supply voltage has recovered. If Normal mode is selected, the output drivers are enabled once both VCC and VIO are again within their operating ranges and TXD has been reset to HIGH. 7.2.4 Overtemperature protection The device is protected against overtemperature conditions. If the junction temperature exceeds the shutdown junction temperature, Tj(sd), the CAN bus drivers are disabled. When the junction temperature drops below Tj(sd)rel, the CAN bus drivers recover once TXD has been reset to HIGH and Normal mode is selected (waiting for TXD to go HIGH prevents output driver oscillation due to small variations in temperature). 7.2.5 I/O levels Pin VIO of the TJR1441A should be connected to the microcontroller supply voltage (see Figure 11). This adjusts the signal levels on pins TXD, RXD and S to the I/O levels of the microcontroller, allowing for direct interfacing without additional glue logic. All I/O levels are related to VCC in the TJR1441B/D and are, therefore, compatible with 5 V microcontrollers. Spurious signals from the microcontroller on pins S, S_N and OFF are filtered out with a filter time of tfltr(IO). |
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