topic Analogue reference voltage pin in MKL03Z8VFG4 in Kinetis Microcontrollers

Analogue reference voltage pin in MKL03Z8VFG4

mrinal — Sat, 04 Mar 2017 12:27:42 GMT

Hi!

My application requires sampling of three analogue lines and transmitting the results via serial line.

I am thinking to use MKL03Z8VFG4.

But I am not sure about the analogue reference voltage pin. The datasheet says (on page number 34): "For packages without dedicated VREFH and VREFL pins, VREFH is internally tied to VDDA, and VREFL is internally tied to VSSA".

The 16-pin package does not have dedicated VREFH and VREFL. So the reference pin should be internally tied to VDDA. However the package does not even have a VDDA pin. As far as power is concerned, there are only two pins i.e. VDD and VSS.

What does this mean? Does it mean that VDDA and VDD are the same? The datasheet also mentions that there is a 1.2V on chip voltage reference. How to use this reference?

Please help...

Thank you!

Re: Analogue reference voltage pin in MKL03Z8VFG4

kerryzhou — Mon, 06 Mar 2017 10:36:56 GMT

Hi Mrinal Mani,

1. Analog reference pin

So, VREFH, VDD, VDDA is the same pin in VDD pin. VREFL, VSSA, VSS is the same pin in VSS.

2. 1.2v on chip voltage refernce

VREF_OUT is in pin PTB2, it can output 1.2V.

More details, please refer to the KL02 reference manual, Chapter 30 Voltage Reference (VREF)

Wish it helps you!

If you still have question, please let me know~!

Have a great day,

Kerry

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Re: Analogue reference voltage pin in MKL03Z8VFG4

mrinal — Thu, 09 Mar 2017 08:43:37 GMT

Hi!

Thanks for the reply. The reference manual solves the purpose. It mentions how to use the internal 1.2V source as VREF for the ADC.

Regards

Mrinal