DM2050H

The DM2050H Power Gauge Module is a complete and compact example solution for capacity monitoring of Li-Ion battery packs. The DM2050H incorporates a bq2050H Gas Gauge IC, a 0.03 current sense resistor, and all other components necessary to accurately monitor and display the capacity of 3 series cells.

The DM2050H includes five LEDs to display remaining capacity in 20% increments of the learned capacity. The LEDs are activated with the onboard push-button switch.

Contacts on the DM2050H provide direct connection to the battery stack (BAT+, BAT-) and the serial communications port (HDQ). The RBI input provides backup power to the bq2050H if the cells are removed or thebattery is turned off. The DM2050H has a 1F capacitor\ onboard connected to RBI to supply backup power for about an hour. In battery packs that use high-side FETs to control the charge/discharge of the Li-Ion cells, the RBI input can be wired to a single cell to provide prolonged data retention times. The SD input allows an external signal (active low) to turn the bq2050H IC off to minimize internal current consumption of the battery pack and maximize storage life of the pack in the system. When turned off, the DM2050H is non-functional, and the RBI power source maintains register information. Please refer to the bq2050H data sheet for the specifics on the operation of the gas gauge.