Working with a customer on this device,
They are using the 0.9V version, but with an input resistor chain, and need to accurately model the input current.
On Sheet 5 of the datasheet, Isense is given as 2.5µA max, 2.1µA typical, but at 5V. This implies an input resistance of 2MΩ.
However, in Figure 7.1 on Sheet 13, the resistor chain is shown as 4.5MΩ, but do understand this is indicative of one version only.
We need to know if the figures for Sense current at 5V hold for 0.9V, and to better understand the input chain resistance for this version.
Note: They are keen to know if this maximum (or typical) SENSE current is fully applicable to the low voltage versions, because they see less than half the bias current on the 0.9V version against the 3V3. Their application is quite sensitive to this current, so we want to fully understand it for the 0.9V version.
From product team in the past:
Isense takes into account multiple current draws, including the draw of the sense ladder and the internal amplifiers. The current draw of the operation amplifiers shown in Figure 7.1 contributes to the total current draw. The current sense ladder's total resistance is 4.5MOhm, and the 2.1µA typical/2.5µA maximum Isense characteristics apply to all variants except the adjustable.
