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dc2042af
DEMO MANUAL DC2042A
APPLICATION INFORMATION
SAMPLE OPERATION OF THE LTC3459 CIRCUIT
WITH VARYING LIGHT LEVELS IN A WIRELESS MESH
NETWORK APPLICATION.
Figure 13 shows a demonstration system using the
DC2042A EH multisource demo board connected to a
DC9003A-B Dust Mote, all powered by a G24i, Indy4100
solar panel and a CR2032 primary cell lithium-ion bat-
tery. The G24i Indy4100 solar panel has four lanes and is
100mm long. The system will duty cycle the battery use
as needed when the light level is insufficient to power the
wireless sensor node continuously. The scope photos
show in Figures 14 through 17 how the supply voltage on
the DC9003A-B is switched between the energy harvested
power (3.312V – 2.25V) and the battery voltage (3.0V).
In this way the life of the battery is extended as much as
possible.
Legend for (Figures 14 to 17):
1) The ground for the probes is referenced to the GND on
the mote board.
2) Probe Signals:
a) GREEN = VMCU on the EH Board (J2-1 on DC2042A)
b) YELLOW = PGOOD_LTC3459 (J2-4 on DC2042A)
c) BLUE = VBAT on Mote Board or (J2-6 on DC2042A)
d) PINK = VSUPPLY (P2 -1 on Mote Board)
Figure 13. Solar Powered DC2042A in a MESH Wireless Sensor Network
