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UCD90320: IMON of TPS259824 connected to AMON pin

Part Number: UCD90320

Hi Yihe :

We want to use IMON of TPS259824 and connect it to AMON of UCD90320 to monitor current consumption.

Since IMON is a current output pin of TPS259824, so I need to check some items with you.


1. Does RADC means resistance of AMON pin to GND?

Could you help provide typical and minimum value of it to us?


2. If IL (ADC input leakage current) = max : 2uA and RADC = max : 2.5k ohm

(1) So there will be a Vmax = 5mV on AMON pin to GND => Is it correct?

(2) If RMON is 2.21k ohm, Iout = 6A so there's 6*246uA/A = 1.476mA flow out of IMON pin

a. VAMON(max) will be 1.476mA * (2.21k//2.5k) = 1.731V

b. Or current flow through RMON, min. value is 1.476mA - 2uA = 1.474mA.

So VAMON(min) will be 1.474mA * 2.21k ohm = 3.258V?