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Atmel C51 Manuale Utente

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Hardware Description
2-5
C51 Microcontrollers Demo Board User Guide
4119C–8051–3/03
2.4
Board Supply 
Considerations
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Power connector J1 or battery connector J2 may be used to power the board.
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On J2 connector a rechargeable battery or a non-rechargeable battery may be used.
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In case of rechargeable battery usage on J2, if J18 is ON the battery is charged when 
the board is powered by J1.
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Board may be powered by J2 for about 10 hours with one new non-rechargeable 
battery.
Note:
J18 must be Off, when the board is powered by J1
 
with a non-rechargeable 
battery connected on J2 (see figure 3).
Figure 2-2.  C51/C251 Demo Board powered by J1 with a non-rechargeable battery on J2
Figure 2-3.  C51/C251 Demo Board powered by J1 with a rechargeable battery on J2
J1 Power Supply Connector
9V to 12V DC IN
J18
9V
PP3
J2
OFF
non-rechargeable
battery
AC-DC
LCD display
LCD display
J1 Power Supply Connector
9V to 12V DC IN
J18
9V
PP3
J2
ON
battery is being charged
In this configuration
rechargeable
battery
AC-DC