Post Go back to editing

LTC2992: no sensing current


I connected a 0.5 Ohm shunt for measurement of small current (up to 0.1A) with a voltage up to 5V, following the figure  "4c: Derives Power from a Separate Low Voltage Supply" of the chip datasheet. As platform, I am using an ESP32 from Espressif and your lib

I can read correctly the Sense1+ and Sense2+ voltages through i2c but not the current. Measuring with an amperemeter, the current is correct, but reading the current registers there is 0. I soldered another LTC2992 as replacement but the same problem occurs.

I am using continuous mode; here is the value for CTRLA:


Here is the manufacturing id and ctrla:

manufacturing id and ctrla

All registers settings (first line is ones digit, first column is tens digit):


Here is reading the status (with a voltage of 1.5V on each sense and same current of 50mA):

- on one line the current1 raw registers are printed

- on the next line: adc status, current 1 code (current registers combined), current 1 in [A], sense 1 code, sense 1 in [V], current 2 code (current registers combined), current 2 in [A], sense 2 code, sense 2 in [V]

Parents Reply Children