AFE4300

Swetha S

Prodigy 110 points

HI Amy,

Can you say how to calculate the ADC Code for the resistance using for BCM Calculation.

In the BCM Calibration file you had mentioned as 9074 for the resistance value 689.4

Can you please explain us.

Thanks in advance.

Waiting for your kind reply.

over 9 years ago

0 Amy Schnoor over 9 years ago

TI__Mastermind 18285 points

Swetha,

We have received this post and will respond soon.

0 Amy Schnoor over 9 years ago in reply to Amy Schnoor

TI__Mastermind 18285 points

Swetha,

Sorry for the delay. This was measured in the GUI by plugging in the reference resistors. OR you can calculate as follows.

There is a 1Kohm=690mV, VRef=1.7V

So,

(Rx/1k)*690mV=Volts

(Volts/VRef)(32768)=ADC Codes

0 Swetha S over 9 years ago in reply to Amy Schnoor

Prodigy 110 points

Hi Amy,

Thanks for your replay. Is that the injecting current is 690uA.

We will try to implement the equation in our coding.

0 Amy Schnoor over 9 years ago in reply to Swetha S

TI__Mastermind 18285 points

It's the ratio of we have of 1Kohms=690mV, so yes the current would be 690uA

0 Swetha S over 9 years ago in reply to Amy Schnoor

Prodigy 110 points

Hi Amy,

We have one doubt can you help us.

As you said,

There is a 1Kohm=690mV, VRef=1.7V

So,

(Rx/1k)*690mV=Volts

(Volts/VRef)(32768)=ADC Codes

What is that Rx refers.

Thank in advance waiting for your replay.

0 Amy Schnoor over 9 years ago in reply to Swetha S

TI__Mastermind 18285 points

Rx refers to one of the reference resistors.

Data converters

Data converters forum

AFE4300