Ramp-AC RF DVK Hardware
Version 1.0
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6
CONN-GUIDE-RAMP-AC-DVK-HW
Switch / Jumper
Description
RADIO VOLTAGE
(J9)
If this jumper is moved to the +5V Radio
position, the transceiver is powered with 5V.
If this jumper is moved to the +3.3V Radio
position, the transceiver is powered with
3.3V. The AC4x90-1000, AC4868 and AC4x90-1x1 must have this jumper set to 3.3V.
Note: Special care should be taken when setting this jumper. An improper setting
can cause catastrophic damage to the transceiver.
FORCED
CONFIGURATION
(J11)
When this jumper is moved to the Normal Operation
position, the transceiver
communicates at the Baud Rate configured in the EEPROM.
When the jumper is moved to the Forced 9600 Recovery
position, the transceiver
interface baud rate is forced to 9600 Baud upon reset. This is for EEPROM recovery
only and should not be used in normal operation.
POWER SOURCE
(J7)
When this jumper is moved to the Power Conn position, power is supplied to the SDK
board through the power connector (J4).
When this jumper is moved to the Batteries
position, power is supplied to the SDK
board through the two AA battery sockets on the bottom of the SDK board.
Note: Special care should be taken when selecting batteries to power the SDK. High
quality Alkaline batteries should be used. Do not mix battery types or batteries
that have been used unequally as performance could suffer. Four Alkaline
batteries produce a voltage of 6V. A minimum of 5.5V is required to power
the SDK board. Power should be constantly monitored when using battery
power.
If USB Power is selected, the transceiver and development board receive power from
the USB port. USB power should only be used for AC4486, AC4490, AC4790, and
AC4868 product families. Most USB ports can only supply 500 mA of power max
therefore it is recommended that USB power only be used with transceivers that draw
less than 300 mA peak.
Note: Though PCs should have over-current protection for their USB ports, drawing
too much current through the USB port can cause damage to the PC and
should be avoided.
Table 2: Status LEDs
LED
Description
+VCC
Lights when power is applied to the serial adapter board.
LOW POWER
Monitors the 5V supply and lights when the supply dips below 4.8V.
RESET
Lights when the reset line to the processor is high, resetting the transceiver.
TxD
Lights when TXD line is low; a rapid flash occurs when data is sent from transceiver to
host.
RxD
Lights when RXD line is low; a rapid flash occurs when data is received by transceiver
from host.
Forced 9600
Recovery
Lights when 9600 Baud line is low; shows the FORCED CONFIGURATION jumper is set to
force transceiver to 9600 Baud. The transceiver must be reset before it is forced to 9600.
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