Other Parts Discussed in Thread: BQ27320
Hello,
I have been using the bq27520-G4 in one of our products for several years now (so have experience with the software/tools/processes). I am now designing two new products and would appreciate some advice on the best fuel gauge chips to meet our needs.
The two products:
a) 1S2P up to 10Ah Li-Ion cells -- cells directly attached to system PCB, option for protection integrated with FG (or separate)
b) 2S2P up to 20Ah Li-ion cells -- plug in pack with system or pack side FG
Both products will behave as follows:
* Long battery life (> 3 months)
* Wireless (combination of 4G/5G/BT/ZigBee/WiFi), so loads are mostly pulsed (typ. less than 500mA)
* Wireless activity every 1-15 minutes typically (not always predictable)
* Different operating modes where base current could be <1mA or as much as 30mA
* Operation may be continuous over a battery discharge cycle (i.e. no down-time)
* I can implement a periodic operation to assist with gauge accuracy if required (possible but not preferred)
* Full (or close to full) discharge will likely occur from time to time, but won't be the norm
* Access to battery health data would be good
* Battery pack is custom (xxx
Other considerations:
* Space is not of major concern but manufacturability is. So we prefer to avoid BGAs and components smaller than 0603. However, if there is a good choice which is only available as BGA I will consider it.
* Charging will be from a 12V source (not USB)
* Charge current of 3A or higher, but I can flexible here (esp. for product 'a')
Also, I have a couple of specific questions...
1. Would IT or CEDV be the best option for these products (in terms of accuracy over the cycle and life of the pack?
2. What advice can you offer on setting sleep current (or even disabling sleep altogether) for our kind of loads?
Regards, Ross
