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ADC
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  • Forum Post: Re: CC2540 External Reference Pin Out and Memory Block Size Question

    Karl T.
    Mike, On question 1), yes, you should connect your external 2.2V reference to AIN7. Make sure to select AIN7 as a reference rather than the internal one (ADCON2). Karl
    on Oct 18, 2010

  • Forum Post: Re: CC2540 test pin

    Christopher Calvo
    Marco, I am attempting to do a similar application however without the need to power my sensor from the CC2540. I was wondering if you had made any headway at all on this? And if there was any information you could share with me to get me started off in the right direction? Thank you, Christopher...
    on Feb 3, 2011

  • Forum Post: Re: CC2540 test pin

    Christopher Calvo
    Marco, I took your advice and went ahead and tried to retro-fit some code together to at least get the pin P0_6 to be read in as an analog ADC value. I used the battery code in the keyfobdemo and changed it around as to read in P0_6 ADC analog value (adc_read) and if the value is less than 511 it...
    on Feb 4, 2011

  • Forum Post: CC2540 External Analog Sensor

    Christopher Calvo
    All, I have recently purchased your CC2540 Mini Development Kit which includes the keyfob and USB dongle. All the hardware seems to work fine however I am now trying to get my own working application loaded up and working on the keyfob. However I am running into problems. Here is the basic idea of...
    on Feb 2, 2011

  • Forum Post: CC2540 test pin

    Marco55973
    Dear experts, I'm trying to add an analog sensor to the CC2540. In the Keyfob Reference Design I found that pin 1 and 3 correspond respectively to P0_6 and P0_7. I decided to use P0_6 as analog input and P0_7 to control the power feed of my sensor. I realized my Hal_sensor.c and .h files containing...
    on Jan 4, 2011

  • Forum Post: Re: CC2540 ADC conversion sequence and op amp

    Vasco Tesi
    hec I am afraid the sequence in this case also includes the op-amp input pins. Hello Hec and thank you for your reply. So, we have to perform a sequence ADC conversion but we cannot do it automatically : some microcontroller instructions are needed. How can we handle potential conflicts...
    on Mar 16, 2011

  • Forum Post: cc2540 ADC DMA

    Michael Mazlin
    Hi, where can I find an example code to continiously sample one ADC and transfer readings to the memory via DMA for cc2540?
    on May 14, 2011

  • Forum Post: Re: CC2540 ADC

    Karl T.
    Hi Robert, If you look in the datasheet on page 11, there is a table with conversion times for the various accuracy settings. At the lowest accuracy (fastest) setting, a conversion takes 20 us, which corresponds to 50 ksamples/s. Best regards, Karl
    on Jun 16, 2011

  • Forum Post: Maximum reference and input voltage for cc2540 ADC

    Brandon Richins
    I'm trying to read a signal that is between 2.5 and 4.5 volts and I'd like to use a 5 volt external reference on the ADC but it looks like all pins, including the references, cannot be above VDD which would be <= 3.9 volts. Is this correct? User's Guide 12.2.1 ADC Inputs ...
    on Sep 1, 2011

  • Forum Post: Accurate timing using OSAL on CC2540

    Nick Close
    For a project that uses the CC2540, I need to perform ADC conversions periodically (every 4ms). It doesn't matter if there is some jitter in the time between conversions as long as it averages out to 4ms (+/- 10us). I could use one of the available timers to generate a periodic interrupt to achieve...
    on Oct 6, 2011

  • Forum Post: Question about ADC of CC2540

    Jianfeng Lv
    Hi sir, I am using ADC of cc2540 in a sensor project. 6 Channels from AIN0 to AIN5 are used. ADC is configured as 14bit DMA mode. AIN7 is used for reference voltage which is 2.5V. The problem is that when ADC pin is floating, there is a 1kHz or so square waveform detected on the pin. Peak to peak...
    on Dec 30, 2011

  • Forum Post: Re: using cc2540 as a/d from resistive touch screen

    Fredrik K
    Hi Omri, I am not sure why you believe the CC2540 ADC is designed for audio only. You should be able to use the ADC to read your resistive touch screen, but of course you have to read the datasheets to verify it. /Fredrik
    on Jan 9, 2012

  • Forum Post: Re: Programming CC2540 to use as temperature sensor

    Fredrik K
    Hi Kurubel, Please have a look in the CC253x/4x User Guide chapter 12. BR, Fredrik
    on Mar 29, 2012

  • Forum Post: Re: CC2540 ADC conversion sequence and op amp

    Katie Miller
    Hi Chen bono, Can you post the entire modified code that works on the CC2530 please? I am having trouble getting mine to work.
    on Apr 18, 2012

  • Forum Post: CC2540 ADC conversion sequence and op amp

    Vasco Tesi
    If APCFG = 0xFF ( all Port 0 I/O are analog ones) and the op amp is turned on through OPAMPC |= 0x01 , does this operation prevent from considering also AIN0, AIN1, AIN2 as ADC inputs in the setup of a conversion sequence ? That is : if I program ADCCON2.SCH = 7 , the conversion sequence comprises also...
    on Feb 25, 2011

  • Forum Post: RE: How to detect battery level while using CC2540 and TPS62730

    George Lin
    Hi Karl, In EVM CC2541+TPS62730 reference design. Port1 pin2 was used to control TPS62730. I am wondering if it possible to add P1.2 control in function "static uint8 battMeasure( void )", set P1.2 to LOW before ADC measurement and set P1.2 to High after measurement ? Best regards,...
    on May 11, 2012

  • Forum Post: RE: Is it possible to pre-empt the BLE SW stack on the cc2540 so that the ADC has highest priority?

    Igor Sherer
    Hi Amy, General info (...\BLE-CC254x-1.2.1\Documents\TI_BLE_Software_Developer's_Guide.pdf, section 3): "The BLE protocol stack, the profiles, and all applications are all built around a non pre-emptive Operating System Abstraction Layer (OSAL). Several layers of the BLE stack, for example...
    on Jun 30, 2012

  • Forum Post: ADC/DMA CC2540

    Yo Joe
    Hello, I'm developing a design that uses the heartrate sample app for the CC2540 and I plan on using the onboard ADC to read the heart rate measurement. I've set P0.6 as an anolog input and I've also configured the ADC to use this port. My question is in which .c file would I include the...
    on Feb 15, 2012

  • Forum Post: RE: Reference voltage for CC2540 ADC

    Per H
    Hi rswl88, You will find that internal reference voltage together with other characterization number of the ADC in the CC2540 data sheet here: http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=cc2540&fileType=pdf Cheers
    on Aug 8, 2012

  • Forum Post: CC2540/1 Internal ADC reference voltage

    Jonathan Tate1
    What is the accuracy of the internal ADC reference voltage? I believe it is about 1% because the chip requires a 1% 56k resistor for internal biasing. Otherwise, I couldn’t find any more info in the data sheet on internal reference accuracy.
    on Sep 15, 2012

  • Forum Post: CC2540 ADC ADCCFG question

    QMW
    In hal_adc.c, why it disable the channel after conversion is done? /* Disable channel after done conversion */ ADCCFG &= (adcChannel ^ 0xFF); If I use all the pins of Port-0 for ADC, does it make sense to enable them "APCFG=0xFF;" all at the beginning? Thank you for reading! ...
    on Oct 16, 2012

  • Forum Post: CC2540 ADC Differential Voltage Reference Problem

    QMW
    I have been testing the ADC of CC2540. I got some (seeming) abnormal reading using Differential voltage reference (in differential input mode). Here is the setup: The following 2 functions were used: HalAdcRead ( HAL_ADC_CHN_A4A5, HAL_ADC_RESOLUTION_8); and HalAdcSetReference(HAL_ADC_REF_DIFF...
    on Oct 16, 2012

  • Forum Post: CC2540, ADC, Temperature Read

    Larry Madore
    Does anyone have the setup for the CC2540 ADC to read the temperature? HalAdcSetReference( HAL_ADC_REF_125V ); adc= HalAdcRead( HAL_ADC_CHANNEL_TEMP, HAL_ADC_RESOLUTION_12 ); This is my setup and I'm getting value way out of line. Larry
    on Oct 21, 2012

  • Forum Post: some confusion about cc2541 vref value.

    forall reg
    vref=1.15V in the cc2541 document. but my actual measurement =1.2V , which is the correct value? i give a 3.0V power on cc2541,and use the adc 12bit convertion to measure the vdd/3 . when i use vref=1.2V to calculate the vdd,i get vdd=3V. if vref=1.15 ,why my above measurement indicate the vref=1...
    on Jan 6, 2013

  • Forum Post: CC2540 ADC (external trigger) and wake-up from sleep

    Jens Schwarzer
    Hi :) I have a CC2540 where I use the ADC. The ADC is set to start on external trigger on the P2.0 pin. Currently, sleep is disabled and it works fine. But I am wondering what will happen if the board enters sleep (PM1/2/3), i.e., if I enable sleep mode? I assume the board will wake-up if an...
    on Jan 23, 2013
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