Z-World EG2110, User Manual

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30 RabbitLink (EG2110)
C.3.2 Flash EPROM
The RabbitLink is designed to accept 128K to 512K of flash memory packaged in a TSOP case. It
comes with two 256K flash memories, one for the firmware and one for data. Figure C.3.1-1 shows
the locations and the jumper settings for the jumpers at JP2 and JP3 used to set the flash memory
size. The “jumpers” are 0
Ω
surface-mounted resistors.
NOTE: Z-World recommends that any customer applications should not be con-
strained by the sector size of the flash EPROM since it may be necessary to
change the sector size in the future.
C.4 Power Supplies
Power is supplied to the RabbitLink board from an external source either through jack J4 or
through screw terminal connector J5. The connection through jack J4 is protected against reverse
polarity by a Schottky diode at D1 as shown in Figure C.4.0-1.
Figure C.4.0-1 RabbitLink Power Supply Schematic
The power supply connection through jack J4 is handy for the AC adapter included with the Rab-
bitLink tool kit for desktop demonstration and development. The power supply connection through
screw terminal connector J5 enables you to connect the RabbitLink directly to a power supply in
the production system.
Capacitor C8 provides noise and ripple stabilization protection for the voltage regulator, and
allows the external power supply to be located some distance away from the RabbitLink. A switch-
ing power regulator is used. The +RAW input voltage may range from 9 V to 40 V.
C.5 Reset Generator
The RabbitLink uses a reset generator, U14, to reset the Rabbit 2000 microprocessor when the
voltage drops below the voltage necessary for reliable operation. The reset occurs between 4.50 V
and 4.75 V, typically 4.63 V.
47 µF
330 µF
LM2575
U16
Vcc
L1
C1
C8
330 µH
D2
1N5819
14
15
8
1
12
7
17
18
10
2
3
4
1
SWITCHING POWER REGULATOR
POWER
IN
J4
1
2
D1
+RAW
3
J5
6
1
J5