Jumpers
2-24
ADSP-BF526 EZ-Board Evaluation System Manual
JP16
must be installed for OTP writes to be successful. The nominal 2.5V
for OTP is temporarily raised to 7V when
SW20
is configured properly and
PG13
is set high. Care must be taken when
SW20
is configured for the
OTP_FLAG
signal in order to avoid
VR9
driving 7V for an extended amount
of time.
There is a limited amount of time that 7V can be applied to the
processor’s OTP interface. Violating the specifications listed in the
ADSP-BF522/523/524/525/526/527 Blackfin Embedded Processor
Data Sheet
can damage the processor.
Configured properly,
SW20
and
JP16
connect the processor’s
PG13
flag pin
to the shut-down pin of the ADP1611 switching converter (
VR9
). Refer to
“GPIO Enable Switch (SW20)” on page 2-16
ADSP-BF52x Blackfin
Processor Hardware Reference Manual
, and the
ADSP-BF522/523/524/525/526/527 Blackfin Embedded Processor Data
Sheet
for more information about OTP writes.
CHG Control Jumper (JP17)
The CHG control jumper (
JP17
) selects the control line for the mosfet
attached to the charge rate adjustment pin of the ADP2291 linear charger.
When no jumper is installed, the on-board pull-up holds the gate of the
mosfet
ON
. Placing a jumper on positions 1 and 2 of
JP17
allows the pro-
cessor’s flag pin, selectable by
JP15
, to control the gate of the mosfet.
Placing a jumper on positions 2 and 3 of
JP17
pulls the mosfet gate to
ground, disconnecting the drain and the source. For more information on
the ADP2291 single cell lithium ion battery charger, see
The
JP17
jumper is used in conjunction with the
P23
and
JP15
jumpers;
see the following sections for more information:
,
“CHG GPIO Jumper (JP15)” on page 2-23
“Power Measurements” on page 1-36
. By default,
JP17
is installed on
positions 2 and 3.