Hi,
I'm trying to understand how input current limiting works on the bq25896, more specifically what happens when you disable the ILIM pin by clearing REG00-EN_ILIM bit to 0.
Under 9.2.3.3 it says "The charger input current is always limited by the lower of IINLIM register or ILIM pin at all-time regardless of Input Current Optimizer (ICO) is enable or disabled."
Under 9.2.12 it says "The ILIM pin function can be disabled by setting EN_ILIM bit to 0. When the pin is disabled, both input current limit function and monitoring function are not available."
Generally speaking, the bq25896 seems to be a good choice but the datasheet could do with a thorough makeover. E.g. "the device has an additional hardware pin on ILIM to limit maximum input current on ILIM pin." and "The device regulates ILIM pin at 0.8 V. If ILIM voltage exceeds 0.8 V, the device enters input current regulation"?
In the first case it's clear that it's not the ILIM pin input current that needs to be limited and in the second case it seems that ILIM voltage is clamped at 0.8 V, so up to this voltage you can read input current by external ADC and above 0.8 it is in regulation. However, these linguistic flaws make it difficult to interpret/trust the text in other aspects. Does clearing REG00-EN_ILIM to 0 disable input current limiting altogether (including the limit you can set by REG00-IINLIM bits)? How does that combine with "If ILIM pin is short, the input current limit is set by the register."? In this latter case there is no resistor over which to measure voltage, so input current limiting couldn't be dependent on the ILIM pin?
Could you please clarify?
Best regards
Niclas
