The N76E003 ADC can select an internal band-gap voltage as the input pin, which can be used to get the ADC reference voltage, for more accurate ADC results.

At room temperature, all N76E003 band-gap voltage values will be calibrated within the range of 1.17V to 1.27V. If you want to get the actual band-gap value for N76E003, read the 2 bytes value after the UID address.

There are 2 bytes after the UID address that store the actual band-gap value, but the actually valid bit is 12.
The first byte is the upper 8 bits, and the lower 4 bits of the second byte are the lower 4 bits of the 12 bit.

Reading and calculation steps:

Read a bad-gap value with IAP by reading UID;
Merge the upper 8 bits and the lower 4 bits;
Use the following formula to convert to an actual voltage value.
Formula:

Calculation example:
Read the 2 bytes value after the UID address, wherein the first bytevalue is 0x64, and the second bytevalue is 0x0E, merged as 0x64E = 1614. The conversion result is as follows:

Example samples:

void READ_BANDGAP()

{

UINT8 BandgapHigh,BandgapLow;

set_IAPEN;

IAPAL = 0x0C;

    IAPAH = 0x00;

    IAPCN = READ_UID;

    set_IAPGO;

BandgapHigh = IAPFD;

IAPAL = 0x0d;

    IAPAH = 0x00;

    IAPCN = READ_UID;

    set_IAPGO;

BandgapLow = IAPFD;

BandgapLow = BandgapLow&0x0F;

clr_IAPEN;

Bandgap_Value = (BandgapHigh<<4)+BandgapLow;

Bandgap_Voltage = 3072/(0x1000/Bandgap_Value);

}

Products:	Microcontrollers ,8bit 8051 MCUs ,Low Pin Count 8051 Series ,N76E003
Applications:
Function:	Peripherals,Analog,ADC

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How to read the actual N76E003 band-gap voltage? Issue Date：2016-12-22

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