Z-World Fox LP3500 User Manual - page 126

120

Fox (LP3500)

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.

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 

devPowerSet

 function. Table E-1 lists the sections.

NOTE:

RxE always remains active to allow the LP3500 to “listen” while it is in the 

power-save mode.

Table E-1.  LP3500 Sections That Can Be Turned Off

LP3500 Section

Power Consumption

Controlled by

Rabbit 3000 Port

RS-232

8 mA with load

PG1

RS-485

0.1 mA with no load

PG0

A/D Converter

(LP3500 model only)

0.45 mA at 1.5 ksample/s sampling rate

PB6

Relay

(LP3500 model only)

120 mA for 10 ms per switch

PG4, PG5

LCD/Keypad Module

5 mA without backlight, 50 mA for back-

light, 5 mA for each LED (max. 7 LEDs)

PB0

0

20

40

60

80

100

120

140

160

180

200

0

5

10

15

20

25

30

VIN (V)

I (

m

A)