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Feature Article
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Issue #206 September
2007
Smart Power
An Intelligent Power Supply for Embedded Systems
by Alexander Popov & Jordan Popov
Start | Hardware | Software | Calibration | Voltage Presets | Slowly Rising Voltage | Slowly Falling Voltage | Short Time Test | Periodcal Linear Voltage | Periodical Voltage Drops | Future Development | Sources & PDF
SLOWLY RISING VOLTAGE
The condition usually happens while the power supply is powered up (see Photo 3). It can be real trouble because integrated circuits start to operate on lower voltages than specified, but their behavior is unpredictable and unstable. One of the scenarios is that a self-programming microcontroller (every one having a bootloader) incorrectly executes instructions and messes up its nonvolatile or flash memory.
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| Photo 3—Slowly rising voltage can be real trouble for circuits without low-voltage detection. This test should always be performed. |
The preset is configured with two parameters: T_RISE, the time for rising to normal voltage, and V_FROM, the voltage to rise from.
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