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--- current_measurement [2024/04/07 20:54] – river
+++ current_measurement [2024/07/26 21:52] (current) – river
@@ Line 20: / Line 20: @@
   * Is it robust to output overcurrent or overvoltage?
   * What does LED mean?
+== Log ==
+April 2024
+I connected it to a faulty device which drew too much current. The ppk2 firmware crashed as soon as power was switched on, and the device disconnected from USB. It seems like it does not have any overcurrent protection. A forum post said the sense resistors were damaged by overcurrent, and another suggested that they could be partly damaged and ruin the accuracy. Can it be recalibrated?
+== Misc ==
 There is a third party python API: [[https://github.com/IRNAS/ppk2-api-python]]
@@ Line 31: / Line 39: @@
   * 350 μA consumption (quiescent though - working unspecified)
   * 13 bit ADC. 40uV resolution on current sense.
-  * VSHUNT Shunt voltage input –163.84 to 163.8 mV. Quite limitng.
+  * VSHUNT Shunt voltage input –163.84 to 163.8 mV. Quite limiting.
   * [[https://www.ti.com/tool/download/CS-AMPLIFIER-ERROR-TOOL]]
   * [[https://www.ti.com/lit/ds/symlink/ina3221.pdf]]
@@ Line 45: / Line 53: @@
   * TC: Timing control alert. Used for power sequencing test.
   * Board has 10k i2c pullups
+mR shunts gives max measurable current of 1638mA. I think it shouldn't be damaged with more though - abs max values are all much higher.
 {{:ina3221_board.png?600|}}