Hi all,
My application deals with measuring battery voltages using Microchip TC7109CPL(12-bit ADC) and transmitting the data to a pic16f877. To maintain good resolution, I have decided to measure only postive voltages.
The supply to the ADC and PIC controller comes from the lower end batteries of the battery string, and the ADC measures the voltages of all the batteries (the battery channel selection is done using a network of multiplexers) including the ones that power the ADC.
My problem is that I would like to run my system without the need of any negative supplies. The TC7109 has a V- (pin 28) which seems to compulsorily need a negative supply. I tried grounding this pin but it only causes an all high output at the output pins and the POL pin also goes high. Isn't it possible to operate the TC7109 without a negative supply at source?
Regards,
Leo
My application deals with measuring battery voltages using Microchip TC7109CPL(12-bit ADC) and transmitting the data to a pic16f877. To maintain good resolution, I have decided to measure only postive voltages.
The supply to the ADC and PIC controller comes from the lower end batteries of the battery string, and the ADC measures the voltages of all the batteries (the battery channel selection is done using a network of multiplexers) including the ones that power the ADC.
My problem is that I would like to run my system without the need of any negative supplies. The TC7109 has a V- (pin 28) which seems to compulsorily need a negative supply. I tried grounding this pin but it only causes an all high output at the output pins and the POL pin also goes high. Isn't it possible to operate the TC7109 without a negative supply at source?
Regards,
Leo