topic S12ZVLA ADC sampling time in CodeWarrior Development Tools

S12ZVLA ADC sampling time

vyshakhj — Sat, 03 Feb 2018 12:43:10 GMT

Hi,

I need information regarding the precise calculation of ADC sampling time, please go through the controller and configuration that I am using:

Controller: S12ZVLA96

f_bus(bus frequency): 32Mhz

ADC : 6-channel 10 bit

ADC operating mode: Restart Mode, Single access mode

ADC Command sequence list length: 36

Please help me with the information on, what will be the time required for completing conversion of one channel, once a command in command list has been loaded.

As per data sheet I found two calculation related to ADC sampling time, below I mentioned those two formula,

1) Conversion time = 5 Bus cycles + 2 ADC conversion cycles

2) Total Sample time = Buffer sample time + Final Sample time

= 2 ADC CLK + 2 ADC CLK

Can you provide how to correlate these two equations, and what will be the total time required for completing the 36 commands , for the above configuration?

Thanks ,

Vyshakh J

Re: S12ZVLA ADC sampling time

Alice_Yang — Wed, 07 Feb 2018 08:03:34 GMT

Hello Vyshakh J ,

- How do you get the two formulas? Ccoul you please point use screenshot .

- To my understanding , the ADC conversion time includes sample time and hold machine time :

the sample time can configuered using the bit SMP[4:0] of ADCCMD_2 register :

The convesion time = sample tiem +14 ATD.

- And there is a ADC demo and application note , you can refer to:

https://community.nxp.com/message/592008

Alice

Re: S12ZVLA ADC sampling time

vyshakhj — Wed, 07 Feb 2018 13:11:36 GMT

Hi Alice,

Thanks for your information. Actually this formula I have made from , some wordings in datasheet. Anyway your information clarified my doubt.Thanks a lot.

Regards,

Vyshakh j

Re: S12ZVLA ADC sampling time

Alice_Yang — Thu, 08 Feb 2018 03:33:54 GMT

Hi Vyshakh j

Welcome !

Have a great day,
Alice

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