My project uses a 3.7V 850mAh battery which is rapidly being discharged both during standby (within hours) and especially when in use (within 10 minutes) !!!
I am at a loss as to why this is happening and looking for help to diagnose and rectify the issue.
I designed the schematic, PCB (4 layer) and the embedded software.
The main components on my PCB are:
The project receives audio via the bluetooth module and which is then sent to the headphone amplifier.
This is all handled by the dsPIC using the digital audio format I2S, which controls the playback of the bluetooth audio and also plays back 16-bit PCM audio stored in the external flash. The pressure sensor is used to measure altitude.
The schematic is attached.
The CODEC has an internal amplifier but I dont think this will be powerful enough.
The project will be used in a noisy environment, so this is the reason why I have used the external amplifier (TPA6120A2) which uses the DC-DC converter (TPS65136) to supply a +/-5V supply.
I also bought a pair of Tork Xpro helmet speakers...
http://www.torkworld.com/helmet-speakers/xpro-helmet-speaker.html
The specifications of these speakers is 500mw (it doesnt state whether this is peak or rms), 32 ohm.
But during testing, the battery was completely discharged within 10 minutes of use.
I don't know whether the battery capacity or voltage is suitable and the sound from the speakers is not very loud.
So I need to find out:
I have limited understanding and experience when it comes to batteries and audio amplifiers, so was hoping someone could help.
I put the dsPIC in sleep mode when the switch is used to turn everything off and also disable the bluetooth module and the DC-DC converter.
The battery had been on charge overnight, so I am at a loss as to why it drained so quickly.
I am at a loss as to why this is happening and looking for help to diagnose and rectify the issue.
I designed the schematic, PCB (4 layer) and the embedded software.
The main components on my PCB are:
- Microchip 16-bit micro (dsPIC33EP256MU806)
- Bluegiga bluetooth module (WT32i)
- Texas Instruments CODEC (TLV320AIC32)
- Texas Instruments DC-DC converter (TPS65136)
- Texas Instruments headphone amplifier (TPA6120A2)
- Spansion 32 Mbit external flash (S25FL032)
- Bosch pressure sensor (BMP280)
- Maxim battery fuel gauge (DS2745U+) - I have not implemented the I2C software for this device yet
The project receives audio via the bluetooth module and which is then sent to the headphone amplifier.
This is all handled by the dsPIC using the digital audio format I2S, which controls the playback of the bluetooth audio and also plays back 16-bit PCM audio stored in the external flash. The pressure sensor is used to measure altitude.
The schematic is attached.
The CODEC has an internal amplifier but I dont think this will be powerful enough.
The project will be used in a noisy environment, so this is the reason why I have used the external amplifier (TPA6120A2) which uses the DC-DC converter (TPS65136) to supply a +/-5V supply.
I also bought a pair of Tork Xpro helmet speakers...
http://www.torkworld.com/helmet-speakers/xpro-helmet-speaker.html
The specifications of these speakers is 500mw (it doesnt state whether this is peak or rms), 32 ohm.
But during testing, the battery was completely discharged within 10 minutes of use.
I don't know whether the battery capacity or voltage is suitable and the sound from the speakers is not very loud.
So I need to find out:
- Why the battery is being drained so quickly
- Why the speakers are not very loud
I have limited understanding and experience when it comes to batteries and audio amplifiers, so was hoping someone could help.
I put the dsPIC in sleep mode when the switch is used to turn everything off and also disable the bluetooth module and the DC-DC converter.
The battery had been on charge overnight, so I am at a loss as to why it drained so quickly.
Attachments
-
370.2 KB Views: 22