Chapter IV. WSN430 Power

1. Power Supply Options

To supply the MSP430 microcontroller and other external components with all the required voltage, the Worldsens WSN430 offers different power supply configurations. We briefly list below all the different ways to power the WSN430 node:

use a wall power DC adaptor supply.
use the rechargeable Li-Ion Polymer Battery.
use non rechargeable Battery.
use the JTAG cable connected to a PC parallel port.

	Default Manufacture Configuration
	The WSN430 unit is shipped with a default manufacture configuration. By default the node is off. This means that the jumper is not set. See Figure IV.1, “Turning off all battery sources.”.

Turning off all battery supply. One can also carefully unplug the battery but such manipulation implies removing the PCB from its box. Be aware that the battery should be placed at 4mm from the PCB in order to get good antenna behavior.

Figure IV.1. Turning off all battery sources.

2. Wall power DC adaptor supply

Even with the default configuration, one can turn on a WSN430 unit by using one of the Wall power DC adaptors (See Figure II.3, “Power adaptor”). Some precautions must be taken in order not to damage all components.

Wall Power DC adaptor settings

	Wall Power DC adaptor settings
The switch `SHOULD` be on 6 Volt (See Figure II.3, “Power adaptor”) and never higher that 9Volt. Higher voltage will damage the WSN430 node The polarity of the plug is also important and the `plus` sign must be on the central pin. The right configuration is given in Figure IV.2, “Polarity for the wall DC adaptor.” Once the two verification steps above are executed, you can power on the WSN430 node as depicted in Figure IV.3, “Power on the WSN430 using the wall DC adaptor.”

The switch SHOULD be on 6 Volt (See Figure II.3, “Power adaptor”) and never higher that 9Volt. Higher voltage will damage the WSN430 node
The polarity of the plug is also important and the plus sign must be on the central pin. The right configuration is given in Figure IV.2, “Polarity for the wall DC adaptor.”
Once the two verification steps above are executed, you can power on the WSN430 node as depicted in Figure IV.3, “Power on the WSN430 using the wall DC adaptor.”

Check the polarity before connecting the WSN430 node. The plus sign must be aligned with the TIP sign.

Figure IV.2. Polarity for the wall DC adaptor.

The voltage and the polarity MUST be carefully checked before plugging the WSN430 node.

Figure IV.3. Power on the WSN430 using the wall DC adaptor.


	If the jumper is set on the OFF position (See Figure IV.1, “Turning off all battery sources.”), unplugging the wall DC adaptor will immediately shut down the WSN430 node.

3. Rechargeable Li-Ion Polymer Battery

In order to use the Rechargeable Li-Ion Polymer Battery either to recharge it or to supply power to the WSN430 unit the jumper should be set up on the bat position. See Figure IV.4, “Power the WSN430 using rechargeable battery.”). Some precautions must be taken in order to not damage all components.

open carefully the WSN430 unit by removing the front part (See Figure II.2, “Worldsens WSN430 node”.
put the black jumper on the bat position as it is depicted on the Figure IV.4, “Power the WSN430 using rechargeable battery.”.
Once the jumper is correctly set, you may also want to recharge the battery. Simply plug the the wall DC adaptor as it is described above (See Figure IV.3, “Power on the WSN430 using the wall DC adaptor.”.

The black jumper should be set on the bottom position (when the leds are on the left side as on the picture) corresponding to the rechargeable battery configuration.

Figure IV.4. Power the WSN430 using rechargeable battery.

	Battery recharge
when the jumper is on the battery position, do not replace the rechargeable battery by non rechargeable primary battery. when replacing the rechargeable battery, read carefully the actual specification of the Lion Polymer battery and also the characteristic of the MCP73861 linear charge management controller (Chapter III, WSN430 Schematic). We recommend to use Varta PoliFlex Bateries. Reversing the polarity of the battery is strictly prohibited. A wrong polarity will damage the WSN340 unit Reverse charging is also prohibited. If the battery cells are connected improperly, it can not be charged. Reverse charging may cause damage to the cells and may lead to a loss of cell performance and cell safety, which can lead to heat generation or leakage.

Battery recharge

when the jumper is on the battery position, do not replace the rechargeable battery by non rechargeable primary battery.
when replacing the rechargeable battery, read carefully the actual specification of the Lion Polymer battery and also the characteristic of the MCP73861 linear charge management controller (Chapter III, WSN430 Schematic). We recommend to use Varta PoliFlex Bateries.
Reversing the polarity of the battery is strictly prohibited. A wrong polarity will damage the WSN340 unit
Reverse charging is also prohibited. If the battery cells are connected improperly, it can not be charged. Reverse charging may cause damage to the cells and may lead to a loss of cell performance and cell safety, which can lead to heat generation or leakage.

4. Non Rechargeable Battery

In order to use the non rechargeable Battery to supply power to the WSN430 unit the jumper should be set up on the pile position. See Figure IV.5, “Power on the WSN430 using non rechargeable battery.”). Some precautions must be taken in order not to damage all components.

open carefully the WSN430 unit by removing the front part (See Figure II.2, “Worldsens WSN430 node”.
put the black jumper on the pile position as it is depicted on the Figure IV.5, “Power on the WSN430 using non rechargeable battery.”.

The black jumper should be set on the top position (when the leds are on the left side as on the picture) corresponding to the non rechargeable battery configuration.

Figure IV.5. Power on the WSN430 using non rechargeable battery.

	Non rechargeable battery
Reversing the polarity of the battery is prohibited. A wrong polarity will severely damage the WSN340 unit Do not use the rechargeable battery when the jumper is in a non rechargeable configuration. Since the linear charger controller is bypassed in such a configuration, the battery will be over discharged. Overdischarging may cause loss of cell performance, or damage battery functions When the jumper is on the non rechargeable battery position (noted pile on the PCB), do not try to recharge them. Hence, do not supply power to the WSN430 by using a wall DC adaptor.

Non rechargeable battery

Reversing the polarity of the battery is prohibited. A wrong polarity will severely damage the WSN340 unit
Do not use the rechargeable battery when the jumper is in a non rechargeable configuration. Since the linear charger controller is bypassed in such a configuration, the battery will be over discharged. Overdischarging may cause loss of cell performance, or damage battery functions
When the jumper is on the non rechargeable battery position (noted pile on the PCB), do not try to recharge them. Hence, do not supply power to the WSN430 by using a wall DC adaptor.