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TJR1441 Datasheet(PDF) 9 Page - NXP Semiconductors |
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TJR1441 Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 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 9 / 31 aaa-036911 OFF (CAN BIAS = high- ohmic) NORMAL (CAN BIAS = VCC/2) SILENT (CAN BIAS = VCC/2) S_N = LOW AND OFF = LOW AND NOT(VCC < Vuvd(VCC) for t > tdet(uv)) VCC < Vuvd(VCC) for t > tdet(uv) OR OFF = HIGH VCC < Vuvd(VCC) for t > tdet(uv) OR OFF = HIGH S_N = HIGH AND OFF = LOW AND NOT(VCC < Vuvd(VCC) for t > tdet(uv)) S_N = HIGH AND OFF = LOW AND VCC > Vuvd(VCC) for t > trec(uv) AND VCC > Vuvd(swoff)(VCC) for t > tstartup S_N = LOW AND OFF = LOW AND VCC > Vuvd(VCC) for t > trec(uv) AND VCC > Vuvd(swoff)(VCC) for t > tstartup from any mode when VCC < Vuvd(swoff)(VCC) for t > tuvd(swoff) Figure 6. TJR1441D state diagram 7.1.1 Off mode The TJR1441 switches to Off mode from any mode when the supply voltage on pin VIO/VCC falls below the switch-off undervoltage detection threshold (Vuvd(swoff)(VIO) in TJR1441A; Vuvd(swoff)(VCC) in TJR1441B/D) or when VCC drops below Vuvd(VCC). This is the default mode when the supply is first connected. The CAN pins and pin RXD are in a high-ohmic state in Off mode. When the supply voltage rises above the switch-off undervoltage detection threshold, the TJR1441 starts to boot up, triggering an initialization procedure. It switches to the selected mode after tstartup, provided VCC > Vuvd(VCC). 7.1.2 Silent mode A HIGH level on pin S selects Silent mode in the TJR1441A and TJR1441B. A LOW level on pins S_N and OFF selects Silent mode in the TJR1441D. The transmitter is disabled in Silent mode, releasing the bus pins to VCC/2. All other IC functions, including the receiver, continue to operate as in Normal mode. Silent mode can be used to prevent a faulty CAN controller disrupting network communications. 7.1.3 Normal mode A LOW level on pin S selects Normal mode in the TJR1441A and TJR1441B. A HIGH level on pin S_N and a LOW level on pin OFF selects Normal mode in the TJR1441D. In Normal mode, the transceiver can transmit and receive data via bus lines CANH and CANL. Pin TXD must be HIGH at least once in Normal mode before transmission can |
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