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TLE9251VLE 데이터시트(PDF) 13 Page - Infineon Technologies AG |
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TLE9251VLE 데이터시트(HTML) 13 Page - Infineon Technologies AG |
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13 / 30 page ![]() Data Sheet 13 Rev. 1.0 2017-08-09 HS CAN Transceiver High Speed CAN Transceiver Changing the mode of operation 6.3 Mode changes by VCC undervoltage When the transmitter supply VCC (VCC < VCC(U/F)) is in undervoltage condition, the TLE9251V might not be able to provide the correct bus levels on the CANH and CANL output pins. To avoid any interference with the network the TLE9251V blocks the transmitter and changes the mode of operation when an undervoltage event is detected (see Figure 8 and Figure 9). In Normal-operating mode an undervoltage event on transmitter supply VCC (VCC < VCC(U/F)) triggers a mode change to Forced-receive-only mode. In Forced-receive-only mode the undervoltage detection VCC (VCC < VCC(U/F)) is enabled. In Stand-by mode the undervoltage detection is disabled. In these modes the TLE9251V can operate without the transmitter supply VCC. Figure 8 Mode changes by undervoltage events on VCC Figure 9 Undervoltage on the transmitter supply VCC STB VCC VIO power-down state “X” “X” “off” Normal-operating mode STB VCC VIO 0 “on” “on” Forced- Receive-only mode STB VCC VIO 0 “off” “on” Stand-by mode STB VCC VIO 1 “X” “on” VIO “on” VCC “off” STB “0” VIO “on” VCC “on” STB “0” Forced-receive only mode Normal-operating mode Normal-operating mode t STB digital supply voltage VIO = “on” tDelay(UV) VCC hysteresis VCC(UV,H) t VCC undervoltage monitor VCC(UV,F) VCC undervoltage monitor VCC(UV,R) tDelay(UV) Assuming the STB remains “low”, for example the STB pin is connected to GND. |
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