UM1806 STMICROELECTRONICS | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 16

Technical content

training and supporting the design of the solid state thin film battery EnFilm™ EFL700A39. directly connected and used in the application for a fast evaluation. Figure 1. EFL700EVALKIT Figure 2. EFL700PMB

1 EFL700 power management board (EFL700PMB)

1.1 Pictures of the power management board (PMB)

1.2 Bloc diagram of the power management board (PMB)

Figure 5. EFL700PMB synoptic Figure 3. EFL700PMB picture top side Figure 4. EFL700PMB picture bottom side

2 EFL700 evaluation kit (EFL700EVALKIT)

2.1 Picture of the complete evaluation kit with the PMB

Figure 6. EFL700EVALKIT picture

2.2 Block diagram of the complete evaluation kit with the PMB

Figure 7. EFL700EVALKIT synoptic

UM1806 General description and features

3 General description and features

The EFL700A39 EnFilm ™ battery brings many benefits compared to conventional battery:

  • Low thickness
  • Low self-discharge
  • Extremely long calen dar and cycle life time
  • High safety with no risk of burning or explosion EFL700PMB and EFL700EVALKIT kits were developed to help designers to evaluate the charges and discharge performances of the EFL700A39 with a proper setup of power management. The EFL700PMB includes one PCB: The power management board (PMB), same size as the EFL700A39 battery mounted on the bottom side. The EFL700EVALKIT includes two PCB: The power management board (PMB) and the additional load board (LB). The power management board (PMB):
  • Manages the charge and the voltage regulation of the EFL700A39
  • Protects battery against deep discharge
  • Supports the recharge through an external energy harvesting
  • Includes a CELLERGY super cap to sustain high pulsed discharge current. The super capacitor can be disconnected with the switch SW1 The PMB can be used in association with USB port, photovoltaic panel or any kind of harvester with its own power management. The PMB can be connected to any kind of load with its own power management circuit. Whatever the harvester and load system are, the PMB allows a safe and efficient use of the EFL700A39 micro-battery. The load board (LB):
  • Includes an analog ammeter and a digital voltmeter allowing the user to monitor: – The current delivered by the source by pressing PB1. – The current going through the EFL700A39 battery by pressing PB2. – The battery voltage
  • Includes a pulsed load emulator with the possibility to adjust the pulsed load cyclic ratio. Its features are: – Enable / disable function by toggling the switch SW3. – Default pulsed load current set to 5 mA during a pulse time of 100 ms every 10 s. – Tunable pulse duration from 1 ms up to 130 ms through RA1 rheostat. – Tunable pulse repetition time from 2 s up to 14 s through RA2 rheostat. The LB can be powered via 2 mm banana connectors or a micro-USB plug.

4 EFL700EVALKIT in details

Figure 8. Description of the PMB and LB boards

UM1806 Using the complete evaluation kit

5 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 100 μA 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 be havior 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 managem ent 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.

6 Using the PMB board separately

real IoT (Internet of Things) application case with a micro-controller and radio circuit. Figure 9. EFL700pmb connections to perform when PMB is used separately

  • 4.2 V output regulated voltage
  • Deep discharge protection when output voltage gets down to 3.2 V
  • USB fast recharge -XPS6WUDS ,WR,¶ ,WR,¶ &RQQHFW\\RXU —&UDGLREDVH V\\VWHPKHUH &RQQHFW KHUH

7 Electrical schematic

Figure 10. PMB electrical schematic Figure 11. LB electrical schematic

8 Bill of materials

Table 1. Bom of power management board (PMB)

Table 2. BOM of load board (LB)

9 Use case with PV energy harvester

Figure 12. Step1 schema Figure 13. Step1 picture

positive now until the voltage threshold of 4.2 V is reached. Figure 18. Step4 schema Figure 19. Step4 picture

Table 3. Document revision history 19-Jan-2015 1 Initial release.