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參數(shù)資料
| 型號： | DRM040 |
| 英文描述： | Single Phase Digital Power Meter Reference Design |
| 中文描述： | 單相電能表的數(shù)字參考設計 |
| 文件頁數(shù)： | 23/80頁 |
| 文件大?。?/td> | 1025K |
| 代理商： | DRM040 |
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Hardware
SuperCap and Li-Ion Battery
DRM040 — Rev 0
Designer Reference Manual
MOTOROLA
Hardware
23
2.6 SuperCap and Li-Ion Battery
The SuperCap (0,47 farad) bridges short term power failures by
supplying the MCU in stop mode until it is discharged to a level where
the Li-Ion batteries will take over. Both the SuperCap and the Li-Ion
batteries feed the MCU via low forward voltage drop schottky barrier
diodes of type MBRM120E. The SuperCap is charged up by a current
limiting resistor of 470 ohms. The two Li-Ion batteries can be selectively
turned off by the MCU via the dual P-channel MOSFETs.
2.7 Trimmable 32768 Hertz crystal oscillator
The timebase of the MCU is a 32768 Hertz tuning fork type crystal. This
crystal as in the case of a watch has to be trimmed precisely to 32768
Hertz for low time drift RTC operation over extended periods of time.
Together with the trimmer capacitor C10 and the 100 kHz output
waveform at Timer1 output pin, the frequency of oscillation can be
trimmed. The 100 kHz signal is generated only in calibration mode.
2.8 LCD display
A 5 volt, four backplane LCD that provides the appropriate metering
symbols has been used.
2.9 Serial communication
Serial communication can be selected via jumpers J5 and J6 to route the
signals of the SCI either to the infrared LED & phototransistor to comply
with the IEC 61107 standard, or via the built in RS-232D level shifter to
the 9-pin D-Sub connector.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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