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MAX3057ASA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3057ASA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page AutoShutdown (MAX3050) To manage power consumption, AutoShutdown puts the device into shutdown mode after the device has been inactive for a period of time. The value of an external capacitor (CSHDN) connected to SHDN deter- mines the threshold of inactivity time, after which the AutoShutdown triggers. Floating SHDN allows the MAX3050 to automatically change from active mode to shutdown. Use a 100nF capacitor as C SHDN for a typical thresh- old of 20ms. Change the capacitor value according to the following equation to change the threshold time period. VSHDN is the threshold of SHDN guaranteed to be less than 2V in the Electrical Characteristics table. Drive SHDN high to turn the MAX3050 on and disable AutoShutdown. When the MAX3050 is in shutdown mode, only the wake-up comparator is active, and normal bus commu- nication is ignored. The remote master of the CAN sys- tem wakes up the MAX3050 with a signal greater than 9V on CANH. Internal circuitry in the MAX3050 puts the device in normal operation by driving SHDN high. The MAX3057 does not have the AutoShutdown feature. Driver Output Protection The MAX3050/MAX3057 have several features that pro- tect them from damage. Thermal shutdown switches off the device and puts CANH and CANL into high imped- ance if the junction temperature exceeds +160°C. Thermal protection is needed particularly when a bus line is short circuited. The hysteresis for the thermal shutdown is approximately 20°C. Additionally, a current-limiting circuit protects the trans- mitter output stage against short-circuits to positive and negative battery voltage. Although the power dissipa- tion increases during this fault condition, this feature prevents destruction of the transmitter output stage. CnF time s VV CC SHDN() .( ) = ×µ − () 002 SHDN ±80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers 10 ______________________________________________________________________________________ FFT 500mV/div CANH - CANL 1V/div Figure 5. FFT Dominant Bus at 2Mbps FFT 200mV/div CANH - CANL 1V/div Figure 6. FFT Recessive Bus at 2Mbps FFT 500mV/div CANH - CANL 1V/div Figure 7. FFT Dominant Bus at 500kbps |
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