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MC33998 Arkusz danych(PDF) 3 Page - Freescale Semiconductor, Inc |
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MC33998 Arkusz danych(HTML) 3 Page - Freescale Semiconductor, Inc |
3 / 20 page Analog Integrated Circuit Device Data 3 Freescale Semiconductor 33998 PIN CONNECTIONS PIN CONNECTIONS Figure 3. 33998 Pin Connections Table 1. Pin Definitions Pin Number Pin Name Definition 1 VKAMOK Keep-Alive Output Monitoring. This pin is an "open-drain" output that will be used with a discrete pull-up resistor to V KAM. When the supply voltage to the 33998 is disconnected or lost, the VKAMOK signal goes low. 2 KA_V PWR Keep Alive Power Supply Pin. This supply pin is used in modules that have both direct battery connections and ignition switch activated connections. 3 C RES Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump. 4 V PWR 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 V SW Internal P-Channel Power MOSFET Drain. V SW is the "switching node" of the voltage buck converter. This pin is connected to the V PWR 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 V KAM, 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 V DDH feedback signal for the switching regulator. 12 V SUM Error Amplifier "Summing Node". The V SUM 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 V DDL (2.6 V) Regulator. The DRVL pin drives the base of an external NPN pass transistor for the V DDL 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 V DDL (2.6 V) Regulator. The FBL pin is the voltage feedback sense signal from the VDDL (2.6 V) linear post regulator. 15 V DDH V DDH is an input supply pin providing power for the buffered sensor supplies and the drive circuitry for the 2.6 V linear power regulator. The V DDH pin is supplied from the switching regulator output, capable of providing 5.0 V @ 1400 mA total output current. 16 V REF2 Sensor Supply #2 Output. The V REF2 pin is sensor supply output #2. 17–20 GND Ground of the integrated circuit. 21 V REF1 Sensor Supply #1 Output. The V REF1 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 |
Podobny numer części - MC33998 |
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Podobny opis - MC33998 |
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