AFE4300 EVM PDK

Hi Archana,

Its 10MOhm between IOUT0 and IOUT1. This is recommended for stability of excitation amp.
To change excitation frequency, you need to program DAC[9:0] bits in "BCM_DAC_FREQ" register.
Example, If AFE4300 is given a CLK of 1MHz.
1) Write 0x0005 to BCM_DAC_FREQ ( is 0x0E) to get ~5KHz excitation frequency.
2) To get ~50KHz, write 0x32 to BCM_DAC_FREQ.
Also, we do not support frequency higher than 150 KHz.
To measure body impedance, you need two electrodes to inject current and two electrode to sense the voltage developed.
Injection electrodes can be connected to two pins of J38/J36 and Sense electrodes can be connected to J21/J10. Placement of these electrodes solely depends on the application, electrode type/size. However we recommend placing all of them on palm as shown in following meter.
www.amazon.com/.../ref=sr_1_1

Before you connect electrodes to the body, please make sure you have patient safety measure in your system.

Regards,
Prabin

Hi prabin ,

With the help of BCM_DAC_FREQ we can employs in FWR mode means single frequency measurements is possible.If we want to perform multiple frequency measurements is. I/Q demod. Then haw we select four different frequencies?
Also I am not understand that calib const.ini- notepad window there is option for FWR frequency and I Q frequency what is this exactly if we can change freq from registers?

Please provide me details calculation about haw to do change in registers section for four different frequencies.

Hi Archana,

For multi frequency measurements you have to change the BCM_DAC_FREQ four times. Each time you change the register you go and capture the data before you change it again.
For e.g. you want to do measurements for 10, 20, 30 and 50 KHz frequencies. So your program flow should be as mentioned below.
Step 1) Reset the AFE.
Step 2) Configure the AFE ( write all the required registers)
Step 3) Set first BCM frequency (i.e. 10KHz) by writing 0x000A to BCM_DAC_FREQ ( i.e. register 0x0E).
Step 4) Capture the ADC output ( Data_1).
Step 5) Set second BCM frequency (i.e. 20KHz) by writing 0x0014 to BCM_DAC_FREQ ( i.e. register 0x0E).
Step 6) Capture the ADC output ( Data_2).
Step 7) Set third BCM frequency (i.e. 30KHz) by writing 0x001E to BCM_DAC_FREQ ( i.e. register 0x0E).
Step 8) Capture the ADC output ( Data_3).
Step 9) Set fourth BCM frequency (i.e. 50KHz) by writing 0x0032 to BCM_DAC_FREQ ( i.e. register 0x0E).
Step 10) Capture the ADC output ( Data_4).
Step 11) Use all four output (i.e. Data_1, Data_2, Data_3, Data_4) for your calculations.

Hope this clear all of your doubts.

Regards,
Prabin

Thank you prabin, but I have one dought still regarding frequency. When we go program file (x86)-texas instrument-AFE4300device GUI-calib const .in then we see there FWR frequency 32 and I Q is 8 16 32 and 64 is present and for every frequencies there is clock decided what is this exactly?
When we perform IQ demod then we get four different mag and phase value for four different frequencies then from where we select four different frequencies at same time?

Then from where AFE4300evm pdk kit support multiple frequency measurements is there any other software?

In AFE4300 GUI when we select I/Q demod then we get four different magnitude and phase format reading then which reading we take exactly out of four reading?

Hello sir ,
Kindly provide me information about AFE4300GUI gives four different magnitude phase reading for single frequency when we perform I/Q demod. Why like this ? Which magnitude phase reading we have to consider exactly ? I ask this this question many times but no one responded.i need information about this bec I am using this AFE4300evm.pdk kit in my project.so please provide me information about this.