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MC33389CDW 数据表(PDF) 19 Page - Freescale Semiconductor, Inc |
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MC33389CDW 数据表(HTML) 19 Page - Freescale Semiconductor, Inc |
19 / 49 page Analog Integrated Circuit Device Data Freescale Semiconductor 19 33389 FUNCTIONAL DEVICE OPERATION Supply and VBAT Block • VBAT Monitoring—VBAT is the main power supply coming from the battery voltage after an external protection diode (for reverse battery). VBAT is monitored for under voltage and over voltage. • VBAT Under Voltage—VBAT is monitored for under voltage if it is below 4.0 V the BatFail flag is set in the VSSR register and a maskable interrupt is sent to the microcontroller. • VBAT Over Voltage— When VBAT is > 20 V, the BatHigh flag is set in the VSSR register. A maskable interrupt is sent to the microcontroller. No specific action is taken to reduce current consumption (to limit power dissipation). This is to allow the entire flexibility to the microcontroller for a decision. CAN Transceiver The device incorporates a low speed 125 kBaud CAN physical interface. Its electrical parameters for the CANL, CANH, RTL,RTH, RX, and TX pins are identical to the 33388, stand alone CAN physical interface. The mode control for the CAN transceiver (Normal, VBAT Stand-by, Sleep, etc.) are selectable through the 33389 SPI interface. • Baud Rate up to 125 kBit/s • Supports unshielded bus wires • Short-circuit proof to battery and ground in 12 V powered systems • Supports single-wire transmission modes with ground offset voltages up to 1.5 V • Automatic switching to single wire mode in case of bus failures • Automatic reset to differential mode if bus failure is removed • Low Electromagnetic Interference (EMI) due to built-in slope control and signal symmetry • Fully integrated receiver filters • Thermally protected • Bus lines protected against automotive transients • Low current Bus Stand-by mode with wake-up capability via the bus • An unpowered node does not disturb the bus lines Figure 5. CAN Simplified Block Diagram CONSEQUENCE OF FAILURE DETECTIONS S1 is the switch from RTH to Ground S2 is the switch from RTL to V2 and S3 is the switch from RTL to VBAT Each failure type provides data concerning which switch is open and which driver is disabled. Failure 1: Nothing done Failure 2: Nothing done Failure3: S1 open. Driver CANH is disabled Failure4: S2 and S3 open. Driver CANL is disabled Failure5: Nothing done Failure6: S2 and S3 open. Driver CANL disabled Failure7: S2 and S3 open. Driver CANL disabled Failure8: S1 Open. CANH driver disable CAN Transceiver Description The CAN transceiver is an interface between CAN protocol controller and the physical bus. It is intended for low — In Sleep Mode, During Disable Time of Cyclic Sense if Configured — Over Temp Threshold Reached — V1 Disabled (for any reason) — V2 Over Temperature Shutdown Table 8. V3 Control Termination Protection RX TX CAN_H CAN_L RTH RTL VDD2 SPI Transmitter Receiver - Fail Detect - Receive Mode VDD2 VBAT CAN Transceiver Register Drivers CAN transceiver simplified block diagram 12.5k S3 S2 S1 VDD BAT RTL CANH CANL RTH |
类似零件编号 - MC33389CDW |
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类似说明 - MC33389CDW |
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