AN2201 Freescale Semiconductor / Motorola, AN2201 Datasheet - Page 2

• Manufacturer Part Number: AN2201
• Description: Low Battery Cranking Pulse in Automotive Applications
• Manufacturer: Freescale Semiconductor / Motorola

AN2201/D
2
12-14V
4,5 - 3.0V
6,5V
U
A simplified power supply for any application might look as shown in
A reverse battery protection diode feeds the Vbat from the battery into the
voltage regulator (with integrated reset circuitry), which then supplies the MCU.
This schematic, applied to the cranking pulse from
where problems are likely to occur
Low Battery Cranking Pulse in Automotive Applications
Freescale Semiconductor, Inc.
For More Information On This Product,
Black Line = VBat coming directly from the car battery
VBat
V Bat
ECU
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5ms
Cranking Pulse
15ms
VBat1
Voltage
50ms
Reg.
(Example from Car maker)
Figure 1
Figure 2
(Figure
Vcc1
Reset
3).
3000ms
Vdd
Figure
MCU
1, shows the areas
100ms
MOTOROLA
Figure
t
2.