Power Architecture
1-32
ADSP-BF526 EZ-Board Evaluation System Manual
Leaving
JP16
ON
when not writing to the OTP memory can damage
the processor. See the
ADSP-BF522/523/524/525/526/527 Blackfin
Embedded Processor Data Sheet
.
In USB host mode, if the host must provide 5V to a device, the
PG13
flag
pin must be set low to turn on the p-channel mosfet (
U23
). To connect
PG13
of the processor to the mosfet, set
SW20.2
OFF
,
SW20.5
OFF
, and
SW20.6
ON
.
The lithium ion battery leads are inserted into the
P24
connector. The
SW22
switch connects the battery to the EZ-Board when
SW22
is
ON
. To
change the battery, press in the white tabs and slide out the battery lead.
The EZ-Board is intended to be used at room temperature
(approximately 21
o
C).
An ADP2291 lithium ion battery charger IC charges the 740 mAh bat-
tery. The charge rate is selected based on a jumper placement and whether
the battery is charging from a wall adaptor or from a USB port. See
for details.
The lithium battery is monitored by the BQ27500 fuel gauge (
U38
). All
battery statistics can be read from the fuel gauge, including time to empty,
current voltage, and current consumption rate.
SW4
positions 1 and 2 dis-
connect the fuel gauge LED signals.
SW4
positions 3 and 4 disconnect the
TWI signals from the processor and fuel gauge. For more information
about
SW4
, refer to
“Gauge Signals Switch (SW4)” on page 2-11
. An exam-
ple program in the POST directory of the ADSP-BF526 EZ-Board
installation demonstrates how to use the fuel gauge.
Change jumper and switch settings only when power is
OFF
.
Содержание ADSP-BF526 EZ-Board
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