• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 2 answers
  • Subscribers 46 subscribers
  • Views 523 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

power consumption using TIDA-00096 Wireless Heart Monitor

Kelxu
Intellectual 320 points
Other Parts Discussed in Thread: ADS1293

All,

We are using TIDA00096 as reference design. We have couple of questions regarding ecg channels and power consumption(using firmware in reference design):

1, if only one channel is used, how to connect ads1293? Let's say channel 1 is usded(PIN1 and 2), can I leave PIN3,4,5,6 floating? if not, how to treat other pins?

2.how much is the average power consumption of TIDA00096 when 3 channels are all running? We have tested a case with only one channel runing(other two channels floating), the current consumption is around 4-5mA on 4V supply. does this look right? it seems little bit high to me.

Appreciate any inputs.

-Kelv

  • 0
    TI__Expert 3350 points

    Hello,

    The connection for one-lead is similar to the three lead minus the LL connection (please see Figure 84 on page 63 of the ADS1293 datasheet and the TIDA00096 schematic).

      - Connect electrode RA to IN1 input

      - Connect LA electrode to IN2

      - Connect RL electrode to IN4

    The RL driver acts as a reference (low impedance path) between the body and the ground of the board.

    The power consumption varies in different modes, it is approximately 0.3 mW/ch for the ADS1293.

     

    B. Mirshab

     

     

     

     

  • 0 in reply to Bahram Mirshab
    Intellectual 320 points

    Bahram,

    Thanks for the input,  here is the puzzling part,

    1. ads1293 calculates common mode by averaging the voltage of input pins IN1, IN2 and IN3, if IN3(LL) is not connected, how is this calculated accurately(i.e., one input to the CM DETECT block is floating)?

    2. IN4 is reference, meaning IN4 has to connect to body. what is alternative if I dont want to connect IN4 to body(save one electrode) while still provide reference to the circuit board?

    appreciate

    kelv

  • 0 in reply to Kelxu
    TI__Expert 3350 points
    Hi Kelv,

    For 1 -lead application only a signal channel is needed (CH1), you need to disable CH2 and program the flex routing mux to connect the RLD output to an input pin; say IN4 as shown in Figure 84, page 63 of the datasheet .

    b. Mirshab
  • 0 in reply to Bahram Mirshab
    Intellectual 320 points
    Mirshab,
    thanks for feedback, we understand in4 to connect to RLD out,
    question:
    Is the chip using in4 as body reference(i.e., as input) or its actually driving the body(in4 as output)? And why?
    kelv