I'd like some help with Zero Volt charging. SLUS757C, p. 3 states that the PMS pin should be connected to PACK to enable 0V precharge using the charge FET, yet SLUU264a, p. 35 suggests that PMS = GND for 0-V Charge FET mode. Should PMS be tied to PACK, or GND to allow zero volt charging?
Also, going back to my earlier post, wouldn't it make more sense to couple the 6V VDDP reference using the BAT54 (SLUA533) directly to the VCC pin on the gauge? This would allow the gauge to power up immediately, rather than having to wait until the cells are charged to the point where the BQ29330's 5.5V startup voltage is reached, keeping in mind that there are three diodes in series (including the FET body diode), which will all impose a voltage drop. The gauge could then command the charger with the precharge current.
Does this seem correct, or am I missing something?
Thank you,
Jeremy.
