DocID026737 Rev 1

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UM1806

Using the complete evaluation kit

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Using the complete evaluation kit

The use of the EFL700EVALKIT discovery kit is recommended to get familiar with the PMB

board operation and thus with the EFL700A39 electrical management characteristics. The

complete discovery kit gives the possibility to monitor the EFL700A39 charging and

discharging currents as if the EFL700A39 battery was used in a real case application with

high pulse current load. It also helps to monitor the charging current delivered by an external

charger like an energy harvesting device or an USB port.

First connect +5 V power supply on LB board via 2 mm banana plugs or USB connector.

Toggle the SW3 switch to the left position in order to switch “OFF” the pulsed load emulator

operation.

Then, connect an external PV panel or any other energy harvesting device having an output

voltage above 5 V to the left side connector of the PMB board as shown in Figure 8 (PV+

and PV- pins).

In order to monitor the current delivered by the PV through the analog ammeter, press the

PB1 push button. The ammeter sensitivity can be adjusted by selecting the correct position

of the RS rotary switch (depending on the PV current capability):

–

Position 1: “10” marking on the ammeter means 10mA current is flowing.

–

Position 2: “10” marking on the ammeter means 1mA current is flowing.

–

Position 3: “10” marking on the ammeter means 100μA current is flowing.

Pressing the PB2 push button will show through the ammeter the current that goes in or out

of the EFL700A39 micro-battery.

Turning “ON” the SW1 switch on the PMB board connects the SMD super cap mounted on

the PMB board in parallel with the EFL700A39 micro-battery for high current pulse

applications (25 mA / 100 ms every 10 s).

The digital voltmeter indicates the charging voltage of either both EFL700A39 and super

capacitor when SW1 switch is “ON” or EFL700A39 alone when SW1 switch is “OFF”. This

digital voltmeter shall indicate +4.2 V when the EFL700A39 is fully charged.

By turning “ON” the SW3 switch (right position), a current burst operation mode is emulated

(default settings: 5 mA / 100 ms every 10 s). In order to see the behavior of the PMB board

and particularly the EFL700A39 and super cap behavior press PB1 or PB2 (never press

both at the same time). This will show how the charger and PMB work together. If the

charge source does not provide enough current, the PMB board will supply burst current

until the EFL700A39 voltage gets down to its security range. Indeed, when the battery

voltage falls below 3.2 V the power management IC embedded on the PMB board will

disconnect the EFL700A39 in order to prevent it from deep discharge.

The adjustment of the pulsed load duty cycle can be performed with RA1 and RA2

rheostats. RA1 controls the pulse duration whereas RA2 controls the pulse repetition time. A

probe scope can be connected between TP3 and TP4 test points to tune the switching time

of the pulse load.

If for any reason there is a need to fast charge the EFL700A39 and the super capacitor then

you can connect the PMB board micro USB plug to an external USB port.