CC2530 Battery monitoring

Real Time Man

Other Parts Discussed in Thread: CC2530, Z-STACK, CC2533

I've been looking around to see if anybody encountered the same issue I'm facing with little success... Every body seems to be uising the ADC to monitor the VDD...

Chapter 13 of the user manual clearly describe the Battery monitor for the CC2530.

I think I understand what need to be done in order to use this feature, it seems pretty straight forward... But It not working for me, the value read from the BATTMON register is not what I expect and I've tried many different settings...

FIrst, I'm must say that I'm using IAR running version 9.02.01 as well as the latest version of the TI Z-Stack home ( Z-Stack Home 1.2.2a.44539 )

Now, this seemed strange to me, but I had to modify current ioCC2530.h from IAR and the associated .ddf file in order to add the definition of both register involved in the battery monitoring. Before I did so, the BATTMON register and the MONMUX register where not defined and obviously I got compile errors...

This lead me to dout that the battery monotoring feature i availability for the CC2530 but again, Chapter 13 is part of the CC2530 user manual...

After defining those two registers in the right files in the IAR system folder, I can use them, view their content in the watch window ect... But something is still wrong... The reset value,, according to chapter 13, is supposed to be 0x39 and I get a big fat 0x00... Also, once I change the value, it seem to be set in the register, but I never got the BATMON_OUT bit to change (I've tried many setting and different wait times...

So, I'd like to know if the battery monitoring is working for any of you and if so, could you point me out to possible misconception from my part?

over 9 years ago

0 YiKai Chen over 9 years ago

Guru 735695 points

If you read first paragraph in chapter 13 of CC253x user guide, you will see "The battery monitor (in the CC2533 only) enables simple voltage monitoring in the devices that do not include an ADC....". It's only for CC2533. If you intend to you do battery measurement, you can use VDD/3 as ADC input. The followings are the sample code to read VDD/3 into vdd variable.

uint16 vdd=0;
ADCIF = 0;
ADCCON3 = (HAL_ADC_REF_125V | HAL_ADC_DEC_128 | HAL_ADC_CHN_VDD3);
// Wait for the conversion to finish
while ( !ADCIF );
// Get the result
vdd = ADCL;
vdd |= ((uint16) ADCH) << 8;

0 Real Time Man over 9 years ago in reply to YiKai Chen

Prodigy 175 points

All this make sense, thanks for your help!

0 YiKai Chen over 9 years ago in reply to Real Time Man

Guru 735695 points

You are welcome.

0 Vamsi Krishna Tibirisetti over 9 years ago in reply to YiKai Chen

Prodigy 160 points

I'm trying to build battery monitoring with cc2530. I'm using "HalAdcSetReference(HAL_ADC_REF_125V)". But the issue is " HalAdcRead(HAL_ADC_CHN_AIN0, HAL_ADC_RESOLUTION_14)" always returns 8191 even when the pin is not connected. It returns 0 only when the pin is short. It is there a better way to monitory my 4.5 v battery. I would really appreciate if somebody could help me with it.

0 YiKai Chen over 9 years ago in reply to Vamsi Krishna Tibirisetti

Guru 735695 points

You can refer to sunmaysky.blogspot.tw/.../cc2530-adc-howto-in-ti-z-stack.html which shows you how to use CC2530 ADC.

0 Vamsi Krishna Tibirisetti over 9 years ago in reply to YiKai Chen

Prodigy 160 points

Thanks Chen for your response. I'm doing exactly as suggested. But however my reading is always 8191 (14 bit resolution), unless I ground the pin. Basically there is no difference whether the pin is open or is connected to the battery. Due to this my voltage divider with very high resistance (180k) ( to limit the current to couple of uA) is not working. I'm using P0.0 (CHAN_AIN0). I tried setting the pin into Tri state as well. But no difference. Any thoughts?

0 YiKai Chen over 9 years ago in reply to Vamsi Krishna Tibirisetti

Guru 735695 points

If you use HAL_ADC_RESOLUTION_10 and do exactly steps in sunmaysky.blogspot.tw/.../cc2530-adc-howto-in-ti-z-stack.html , do you see ADC reading change?

0 Vamsi Krishna Tibirisetti over 9 years ago in reply to YiKai Chen

Prodigy 160 points

Hi Chen,

I really appreciate your help. I tried as you suggested with 10 bit resolution. I still have the same issue. The reading is always 1.15v (511), whether P0.0 is connected or not, unless I ground it ( reading is 0).

//P0SEL &= ~0X01;
P0SEL |= 0x01;
P0DIR &= ~0X01;
P0INP &= ~0x01;
APCFG |= 0X01;

HalAdcSetReference(HAL_ADC_REF_125V);

adc_val = HalAdcRead(HAL_ADC_CHN_AIN0, HAL_ADC_RESOLUTION_10);

fdata = (1.15 * adc_val)/511;

0 YiKai Chen over 9 years ago in reply to Vamsi Krishna Tibirisetti

Guru 735695 points

Try to remove the following code and test again.

//P0SEL &= ~0X01;
P0SEL |= 0x01;
P0DIR &= ~0X01;
P0INP &= ~0x01;
APCFG |= 0X01;

0 Vamsi Krishna Tibirisetti over 9 years ago in reply to YiKai Chen

Prodigy 160 points

Thanks for quick answer. Yes I removed all those lines. Still I see the reading being 511.

0 YiKai Chen over 9 years ago in reply to Vamsi Krishna Tibirisetti

Guru 735695 points

What CC2530 borad do you use? CC2530DK?

Zigbee & Thread

Zigbee & Thread forum

CC2530 Battery monitoring