Customer:
I’ve reviewed the schematic and board files on Github and found them very helpful. However, I’m experiencing an issue that persists after troubleshooting: the DW01A cannot drive the OD pin of the MOSFET initially, so the battery cannot deliver charge when not in a charging condition.
I suspect shorting the 6th pin of the DW01 IC to actual GND might solve this. When I measure the OD pin, it reads more positive with respect to B-, but measuring between OUT- and the reference shows 0V.
Originally submitted via email support on 22 September 2018. Migrated to the forum for community visibility.
Soldered Support:
The DW01 can only be re-enabled by a charger input voltage. This is normal behavior. The DW GND pin must be isolated from system GND because it is powered by the battery.
If you need different functionality, consider more advanced chargers.
Customer:
I suspect the DW01 IC units being purchased may have an inherent issue preventing them from turning on. Can you also suggest a Lithium ion charger IC for a single cell using solar power panels?
Soldered Support:
That is how they are made. I can help, but need more details: application (hobby/professional), charging current, and whether MPPT is needed or other features?
Customer:
We are building an IoT solution for agriculture. It’s a low-power network that consumes hardly 150mA while operating with 12mA quiescent current. We’re powering the node with a TP4056-based Lithium ion charger with built-in battery protection. Can you suggest ideas on efficient charging using solar power?
Customer:
Battery Rating: 3000mAh
Charging Current: 1Ah
MPPT not possibly needed as the requirement is hardly 150mA peak current. If MPPT is suggested, that would also be a great design.
Soldered Support:
This looks like a general purpose Li-ion charger application. A widely used chip is the MCP73831, but it supports only 500mA.
If you’re designing your own circuit, it’s best that you do the picking. Here is a parametric search for Microchip: https://www.microchip.com/ParamChartSearch/chart.aspx?branchID=9011
You can find this for any manufacturer, pick your preferred options and the chip will come up.