MSP430 program for battery charge controller

Akhil Narakasseri

Other Parts Discussed in Thread: MSP430G2432

Hi,

I am a beginner in MSP430 programming in CCS. I am currently working on a Battery charge controller. The micro-controller I am using is MSP430G2432.

Here is what I am looking for:

1) Read ADC input.

2) When ADC value reaches a particular Threshold voltage (V1), a PWM with a specific duty cycle (say 50%) is to be generated.

3) When the ADC value reaches another Threshold voltage (V2), the duty cycle of the PWM changes to another value (say 25%).

Can you help me on this?

over 11 years ago

0 Katie Pier over 11 years ago

TI__Guru* 79561 points

Hi Akhil,

There are a number of code examples for using G2432 here: http://www.ti.com/lit/zip/slac467 I would recommend looking at some of the ADC and timer examples (which show how to make PWMs), and after you understand how each of these examples work on their own, then work to combine these two functions in your code.

Regards,

Katie

0 Akhil Narakasseri over 11 years ago in reply to Katie Pier

Prodigy 40 points

Thanks for your support. I generated the PWM and also read the adc. I am trying to read the battery voltage using a voltage divider and adc. and I set a threshold voltage to turn off the pwm. While I connecting the battery, the battery voltage below the threshold voltage the PWM is stable. but voltage approaches to the threshold value PWM got unstable. My ADC value have some voltage swing. I need to eliminate that swing. I don't want accurate adc reading.

0 Ilmars over 11 years ago in reply to Akhil Narakasseri

Guru 46710 points

Akhil Narakasseri said:
My ADC value have some voltage swing. I need to eliminate that swing.

Battery chargers shall have filter capacitor on output, in parallel to battery which will filter PWM ripple. You shall add capacitor or increase it's capacitance if any, see if it helps

0 Akhil Narakasseri over 11 years ago in reply to Ilmars

Prodigy 40 points

I am trying to measure the battery voltage directly using a voltage divider and adc.

0 Akhil Narakasseri over 11 years ago in reply to Akhil Narakasseri

Prodigy 40 points

Actually I need to average the 10 or 50 adc samples. Then the voltage swing can be eliminate. Is there is any way to average the adc.

0 Ilmars over 11 years ago in reply to Akhil Narakasseri

Guru 46710 points

Akhil Narakasseri said:
Is there is any way to average the adc.

You average ADC as any other sequence of measurements, numbers. Another name of averaging is low pass filtering, moving average filtering

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MSP430 program for battery charge controller