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The linear regulator maintains its output voltage to within ±5% as long as the linear regula-
tor is dissipating less than 0.75 W. Thermal shutdown turns the regulator off when it over-
heats. Figure E-1 shows the power operating curves for the specified VIN range of 3–30 V
DC. Note that while a VIN range of 3–30 V is possible, 3–15 V is recommended to allow
reasonable current.
200
180
160
140
120
100
Figure E-2. Linear Regulator Power Operating Curve
The LP3500 can operate at various different power levels, depending on which sections of
the board are turned off using the
Table E-1. LP3500 Sections That Can Be Turned Off
LP3500 Section
RS-232
RS-485
A/D Converter
(LP3500 model only)
Relay
(LP3500 model only)
LCD/Keypad Module
NOTE: RxE always remains active to allow the LP3500 to "listen" while it is in the
power-save mode.
120
80
60
40
20
0
0
5
10
devPowerSet
Power Consumption
8 mA with load
0.1 mA with no load
0.45 mA at 1.5 ksample/s sampling rate
120 mA for 10 ms per switch
5 mA without backlight, 50 mA for back-
light, 5 mA for each LED (max. 7 LEDs)
15
20
25
VIN (V)
function. Table E-1 lists the sections.
Rabbit 3000 Port
30
Controlled by
PG1
PG0
PB6
PG4, PG5
PB0
Fox (LP3500)
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