Reg. VSUP Voltage, Internal Resistive Divider

mohanvustepalle — Wed, 15 Feb 2017 20:51:12 GMT

I am using 'MC912ZVL32' series. Need to monitor the voltage range from 9 to 16V. For that configured 10 bit ADC with ref voltage as 5V but unable to find out the internal resistive divider of VSUP to ADC.

Below are my observed values at different voltages

VBATT Voltage VSUP voltage ADC value

9V 7.82 V 201

12V 11.2 V 271

16V 15.6V 367.

Based on the above values the relation differs for the voltage and unable to find out the relation in the Reference manual.

It just mentioned as

Kindly let me know if any one knows the Internal resistive divider value.

Thanks,

Mohan V

Re: Reg. VSUP Voltage, Internal Resistive Divider

RadekS — Thu, 16 Feb 2017 09:07:04 GMT

Hi Mohan,

The Internal resistive divider ratio value is specified in Appendix F BATS Electrical Specifications of RM.

The Pin Input Divider Ratio = 9 ( RatioVSUP = VSUP / VADC; with 5.5V < VSUP < 29 V).

The Absolute Error on this divider is typically +/-2% and maximum +/-5%.

Note: The Pin Input Divider Ratio will be 17 when we select 3.3V VDDX output voltage – available only for S12ZVL128/64 derivatives.

I hope it helps you.

Have a great day,
Radek

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topic Reg. VSUP Voltage, Internal Resistive Divider in S12 / MagniV Microcontrollers

Reg. VSUP Voltage, Internal Resistive Divider

Re: Reg. VSUP Voltage, Internal Resistive Divider