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MC33997DW Scheda tecnica(PDF) 3 Page - Freescale Semiconductor, Inc |
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MC33997DW Scheda tecnica(HTML) 3 Page - Freescale Semiconductor, Inc |
3 / 20 page ![]() MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA 33997 3 PIN FUNCTION DESCRIPTION Pin Pin Name Description 1 VKAMOK Keep-Alive Output Monitoring. This pin is an "open-drain" output that will be used with a discrete pull-up resistor to VKAM. When the supply voltage to the 33997 is disconnected or lost, the VKAMOK signal goes low. 2 KA_VPWR Keep Alive Power Supply Pin. This supply pin is used in modules that have both direct battery connections and ignition switch activated connections. 3 CRES Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump. 4 VPWR Power Supply Pin. Main power input to the IC. This pin is directly connected to the switching regulator power MOSFET. In automotive applications this pin must be protected against reverse battery conditions by an external diode. 5–8 GND Ground of the integrated circuit. 9 VSW Internal P-Channel Power MOSFET Drain. VSW is the "switching node" of the voltage buck converter. This pin is connected to the VPWR pin by an integrated p-channel MOSFET. 10 PWROK Power OK Reset Pin. This pin is an "open-drain" output that will be used with a discrete pull-up resistor to VKAM, VDDH, or VDDL. When either VDDH or VDDL output voltage goes out of the regulation limits this pin is pulled down. 11 FBKB Step-Down Switching Regulator Feedback Pin. The FBKB pin is the VDDH feedback signal for the switching regulator. 12 VSUM Error Amplifier "Summing Node". The VSUM pin is connected to the inverting input of the error amplifier. This node is also the "common" point of the integrated feedback resistor divider. 13 DRVL Drive for VDDL (3.3 V) Regulator. The DRVL pin drives the base of an external NPN pass transistor for the VDDL linear post regulator. The collector of the VDDL pass transistor is connected to VDDH. An example of a suitable pass transistor is BCP68. 14 FBL Feedback for VDDL (3.3 V) Regulator. The FBL pin is the voltage feedback sense signal from the VDDL (3.3 V) linear post regulator. 15 VDDH VDDH is an input supply pin providing power for the buffered sensor supplies and the drive circuitry for the 3.3 V linear power regulator. The VDDH pin is supplied from the switching regulator output, capable of providing 5.0 V @ 1400 mA total output current. 16 VREF2 Sensor Supply #2 Output. The VREF2 pin is sensor supply output #2. 17–20 GND Ground of the integrated circuit. 21 VREF1 Sensor Supply #1 Output. The VREF1 pin is sensor supply output #1. VKAM GND GND GND GND VREF2 VDDH FBL DRVL EN SNSEN VREF1 VKAMOK GND GND GND GND VSW PWROK VSUM KA_VPWR CRES VPWR FBKB 5 6 7 8 9 10 11 12 2 3 4 24 20 19 18 17 16 15 13 23 22 21 14 1 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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