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MC33388 Datasheet(PDF) 11 Page - Motorola, Inc |
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MC33388 Datasheet(HTML) 11 Page - Motorola, Inc |
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11 / 28 page  MC33388 MOTOROLA 11 MC33388 PIN FUNCTION DESCRIPTION VBAT (input) : This is the supply line of the device. It can be directly connected to the battery line, can operate up to 27VDC and sustains up to 40V during load dump condition. The supply current is dependant upon the device operation mode. In low power mode, it is as low as 12uA typical. A battery fail flag circuitry is associated to this pin. The Vbat pin must be protected by external component against reverse battery and negative transient voltages. VDD (input) : 5V input supply voltage for the device. In normal mode, the current is up to 5mA typical and do not exceed few uA in Vbat standby mode. An under voltage function is associated to Vdd and resets the device to Vbat standby mode when Vdd falls below 3V. CANH : Bus output driver pin. CANH is a high side switch structure connected to VDD supply. In recessive state, the high side switch is off and bus CANH line is biassed through the Rth pin circuitry and external Rth resistor. In dominant state, high side switch is on and CANH line is switched to VDD. Output voltage is above 3.6V. CANH output is protected against short-circuit to ground, by internal current limitation. A thermal shutdown with hysteresis switches off CANH driver if temperature rises above 150°C. CANH is also protected against short-circuit to higher voltage, such as VBAT by an internal serial diode in series with the switching component. CANH has a pull down current source, typically 75uA, which can be activated under some fault condition. Rth : Connection to the CANH bus terminal resistors. Rth output structure is a low side switch, turned on under normal condition and automatically desactivated under some fault condition. In the application, an external resistor is con- nected between Rth and CANH pins. In recessive state when CANH driver is off, CANH line is tied to ground through the external Rth resistor. CANL : Bus output driver pin. CANL is a low side switch structure to the ground. In recessive state, the low side switch is off, and bus CANL line is biassed through the Rtl circuitry and external Rtl resistor. In dominant state, low side switch is on and CANL line is switched to ground. Output voltage is below 1.4V. CANL output is protected against short-circuit to VBAT, by internal current limitation. A thermal shutdown with hysteresis is integrated and switches off CANL driver if temperature rises above 150°C. CANL is protected against negative voltage, by an internal serial diode in series with the switching component. CANL has a pull up current source, typically 75uA, activated under some fault condition. Rtl : Connection to the CANL bus terminal resistors. Rtl output structure is a low side switch, turned on under normal condition and automatically desactivated under some fault condition. In the application, an external resistor is connected between Rtl and CANL pins. In recessive state when CANL driver is off, CANL line is tied to VDD through external Rtl resistor. In VBAT Standby and Sleep modes, Rtl pin is connected to the VBAT line through an internal switch and a 12.5k Ω resistor. This means that in these modes CANL bus line is biassed to VBAT. Wake up from these modes are detected by CANL line going from VBAT level to CANL wake up threshold level. STB and EN : Input pins used to configure the device into desired mode. These pins are CMOS compatible and are connected to the microcontroller of the application. INH : This is an output of the MC33388 used to control an external voltage regulator having an inhibit input. INH is a high side switch structure, active when the MC33388 is in normal, Receive only or Standby VBAT modes. INH is switched off in Sleep mode to switch off the voltage regulator of the application. INH has no pull down structure. WAKE : This is a high voltage input used to wake up the device from Sleep and VBAT Standby modes. Wake is usually connected to an external switch in the application. The typical wake thresholds are Vbat/2. Wake pin has special design structure and allows wake up from both high to low or low to high transitions. When entering into the Sleep or VBAT Standby mode, the MC33388 monitors the state of the wake pin and stores it as reference state. The opposite state of this reference state will be the wake up event used by the device to enter again into normal mode. An internal filter is implemented, with 8 to 38 µs filtering time delay. Wake pin input structure exhibits a high impedance, with extremely low input current. A serial resistor should be inserted in order to limit the input current mainly during transient pulses. CAUTION : The Wake pin should not be left open. If wake up function is not used, wake should be connected to GND to avoid false wake up. TX : Transmitter input pin to control bus state. It is CMOS compatible and usually directly connected to the TX output of a microcontroller. When TX is at high state, CANH and CANL are in recessive state. When TX is low, CANL and CANH are in dominant state. Special fault handling is provided to this input, in order to detect permanent dominant state (TX low) which would result of CAN bus permanently lock in dominant state and do not allow communication. In case where TX is low for more than 2ms typical, the device automatically switches the bus lines to recessive. TX has an internal pull up resistor to VDD. RX : Output receiver connection to the microcontroller. It reports the bus state to the RX input pin of the microcontroller. RX is high when bus is recessive and low in dominant state. In sleep and standby Vbat modes, RX reports wake up events. NERR : Error output pin which reports errors encountered by the device. When NERR is high, no error is reported, when NERR is low an error has been detected. In Standby VBAT mode NERR reports a wake up event. In receive only mode, NERR reports VBAT power on flag. Table3• Truth Table of RX, TX CAN Bus States TX RX Bus States Comment Low Low Dominant High High Recessive High Low Dominant Bus Driven By Other Node |
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