The Battery Buffer
PHYTEC Messtechnik GmbH 2005 L-602e_3
37
11
Battery Buffer
The battery that buffers the memory is not essential to the functioning
of the phyCORE-P8xC51Mx2. However, this battery buffer embodies
an economical and practical means of storing nonvolatile data in
SRAM and is necessary for data storage in the Real-Time Clock in
case of a power failure.
The VBAT input (pin X1D4) is provided for connecting the external
battery. The negative polarity pin on the battery must connect to GND
on the phyCORE-P8xC51Mx2. As of the printing of this manual, a
lithium battery is recommended as it offers relatively high capacity at
low discharge. In the event of a power failure at VCC, the SRAM
devices (U5/U6) and the RTC (U13) will be buffered by a battery
connected to VBAT.
Power consumption depends on the components used and memory
area. Refer to corresponding Data Sheets for the RAM devices
mounted on the board (refer also to section 12, ”Technical
Specifications”).
Note:
Be advised that despite the battery buffer, changes in the data content
within the RAM can occur. The battery buffer does not completely
remove the danger of data destruction.
Содержание phyCORE-P8xC51Mx2
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Страница 82: ...Published by PHYTEC Messtechnik GmbH 2005 Ordering No L 602e_3 Printed in Germany...