Maxim release independent Li+ battery DS2788, integrated LED driver and key input

Maxim introduced the smallest size DS2788 independent, multi section Li+ battery meter, a single IC integrated LED driver and key input. For compact battery pack space, the device is designed as a lead free 14 pin TSSOP package. DS2788 ideal for use in power tools, electric bicycles, portable household appliances and ultra portable mobile PC.

DS2788 to the remaining Ma hours and the percentage of full capacity in two forms, the report to the host of the remaining capacity of the battery pack, the results of the 4 or all the way through the integrated LED driver output display. Each LED driver can directly absorb the current, only one resistor can set the LED display current, thereby reducing the board space and system costs. A programmable I/O pin can be configured to go all the way to jitter key input to enable LED display.

In order to reduce the requirement of software development, shorten the time to market, DS2788 use the built-in power calculation method, the amount of charge and discharge rate, accurate temperature and battery characteristics, as well as accurate battery current and voltage measurement based on the calculation of the remaining power. Through the internal calibration of the external voltage divider for measuring the input voltage of the battery, the battery can accurately detect the multi section Li+ battery pack. In order to save battery energy, the external FET switch is driven by a pin, and only the voltage divider is opened during the voltage measurement. The capacity of the battery pack is transferred to the host through a 1-Wire interface, which reduces the number of necessary connections between the battery pack and the host to 3.

In addition, DS2788 also provides 16 bytes of EEPROM, dedicated to host system and / or battery manufacturer. The EEPROM can be used to simplify battery batch and Date tracking, and can also be used for nonvolatile storage of system or battery usage data. The only, factory set of 64 bit ROM ID ensures that any of the two DS2788 is not the same, so that the full tracking of the battery group is possible.

Chip starts at $2.72 (1000 chips, us FOB).

Source: power system