Battery
Buffer
©
PHYTEC Messtechnik GmbH 2006 L-658e_5
63
11
Battery Buffer
The connection of a battery buffer is not essential to the functioning of
the phyCORE-LPC2292/94. However, this battery buffer embodies an
economical and practical means of storing data in the SRAM devices.
It is necessary to preserve data from the I
2
C Real-Time Clock of the
phyCORE-LPC2292/94 in case of a power failure.
The VBAT input at pin X700C6 of the board is provided for
connecting the external battery. The negative polarity pin on the
battery must be connected to GND on the
phyCORE-LPC2292/94. 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 RTC will be
buffered by a connected battery via VBAT. The RTC is generally
supplied via VPD in order to preserve data by means of the battery
back-up in the absence of a power supply via VCC.
The battery supply for the SRAM devices is configured with Jumper
J402
. If the SRAM battery supply is enabled the
user must ensure that the battery is capable of supplying both SRAM
and RTC at runtime of the module.
Power consumption depends on the installed components and memory
size (
see section 14, "Technical Specifications"
).
Содержание phyCORE-LPC2292/94
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Страница 144: ...Published by PHYTEC Me technik GmbH 2006 Ordering No L 658e_5 Printed in Germany...