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MC33388D 数据表(PDF) 26 Page - Freescale Semiconductor, Inc |
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MC33388D 数据表(HTML) 26 Page - Freescale Semiconductor, Inc |
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26 / 28 page  MC33388 APPLICATION MC33388 MOTOROLA 12 Table4• Typical Application Schematic I/O WAKE BATTERY VBAT INH VDD C1 STB NERR TX RX GND RTH CANH CANL RTL CAN MCU Port MODULE EN C2 R2 R1 Vdd C4 C3 R4 R3 Switch L1 CAN BUS D1 12V 5V Vss R3 Switch R4 BATTERY option with switch to gnd IC1 MC33388D Component information: R3: 10k Ω R4: >= 33k Ω C1>= 47nF C2>= 4.7uF C3>= 47nF C4>= 10uF L1: optional common mode choke D1: 1N4148 IC1: LM2935 R1=R2=R (500 Ω<R<16kΩ) R/number of nodes>100 Ω Figure 4 above is the typical application schematic. All MC33388 capabilities are utilized : CAN interface, normal and low power modes, wake up source from CAN bus or wake up switch. The MC33388 VDD is supplied through an external voltage regulator having an inhibit input pin. In addition to TX and RX connections to the microcontroller CAN module, the MC33388 requires 3 additional connections to a standard microcontroller I/O port for EN, STB and NERR pins. MC33388 wake pin is connected to an external signal switch. MC33388 allows the signal switch configuration to be either connected to Vbat or to ground through pull up or pull down resistor. Solution with switch to GND is indicated as option in the application schematic. A resistor must be inserted in series with wake pin in order to limit the input current during positive and negative transient pulses. De-coupling capacitors are recommended on the MC33388 VBAT and VDD lines. Those capacitors might be shared with other devices from the same printed circuit board, depending on its configuration. R1 and R2 are the network termination resistors. For proper operation, they must have identical value (R1 equals to R2). Their value is determined by the total network termination resistor and the number of nodes. The total network termination resistor value must be higher than 100 Ω. If a 500Ω termination resistor is chosen, with a system composed of 32 nodes, each R1 or R2 will be 16k Ω. In addition, R1 and R2 values should be chosen between 500 Ω and 16kΩ at each node. The CANH and CANL pin can be directly connected to the CAN bus. A serial common mode inductance can be inserted in order to improve electromagnetic compatibility performances both in emission and susceptibility. Minimum Application Configuration The minimum device configuration is described in minimum application schematic figure 5 below. The device is used as CAN transceiver only and other features are not used. The device EN and STB input pins must be connected to 5V in order to set the device in normal mode. INH and NERR can be left open. CAUTION : WAKE should not be left open and must be connected to a known state, i.e GND. Figure 4. Minimum Application Schematic WAKE BATTERY VBAT INH VDD C1 STB NERR TX RX GND RTH CANH CANL RTL CAN MCU MODULE EN C2 R2 R1 Vdd C4 C3 CAN BUS D1 Vss MC33388D 5V Component information: C1>= 47nF C2>= 4.7uF C3>= 47nF C4>= 10uF D1: 1N4148 R1=R2=R (500 Ω<R<16kΩ) R / number of nodes>100 Ω Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
类似零件编号 - MC33388D |
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类似说明 - MC33388D |
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