Hello, I was wondering if it was possible to use the wireless power solutions with the CC2541 Sensor tag? If not, are there other rechargeable options for the CC2541?
Thanks,
Rick
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Hello Richard,
There are a number of different options for connecting the SensorTag to a secondary power source, the CR2032 being the primary one.
1. The SensorTag can be connected to the EZ430-Battery Pack http://processors.wiki.ti.com/index.php/SensorTag_User_Guide#Battery_Pack_.28Purchased_Seperately.29
2. Use the BQ24200 (my favorite choice) with two diodes that allow for charging of a Li ion battery and the use of an adapter.
3. For a wireless solution, the BQ51050B receiver looks like a good choice since it integrates a Li-Ion charger. http://www.ti.com/lit/gpn/bq51050b
The SensorTag has a TPS62730 DC/DC converter with a Vin max or 3.9V. The lowest output for the charges are 4.1 or 4.2V. A diode can be used to provide the necessary voltage drop for safe operation..
Pin 5 on the SensorTag Terminals is VCC (VDD_EXT). It is not connected. There is a open R040 resistor pad. You would need to put a jumper across this to power the TPS62730.
You can also bypass the TPS62730 and connect you own regulated supply (VDD_REG) to Pin 2 of the SoC Debug /Flash header. The CC254x can handle a 5V supply (it is not recommended though). You would have to verify the supply voltage levels for the onboard sensors before using this method to connect directly to a charger.
Thanks,