Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: DS2745
Edited by the Electronicstalk Editorial Team on 21 October 2005
Battery monitor has
all the necessary data
A low-cost Li-ion battery monitor can be mounted on either the host side or the battery-pack side of the application
New from Dallas Semiconductor, the DS2745 is a low-cost Li-ion battery monitor with an I2C interface. Mounted on either the host side or the battery-pack side of the application, the DS2745 provides current, accumulated current, voltage and temperature measurements - all the necessary data to monitor battery capacity.
This article was originally published on Electronicstalk on 21 October 2005 at 8.00am (UK)
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The DS2788 is ideal for displaying the remaining battery capacity of power tools, e-bikes, portable household appliances and ultramobile PCs
Additionally, with a suggested resale of $0.98, the device is ideal for cost-sensitive applications.
Current is measured bidirectionally over a dynamic range of +/-51.2mV with a resolution of 1.56uV by monitoring the voltage drop across an external sense resistor.
Assuming a 15mohm sense resistor, the current-sense range is +/-3.4A with a 1LSB resolution of 104uA.
Current measurements are performed at regular intervals and accumulated with each measurement to support accurate coulomb counting.
Battery voltage is measured through a dedicated voltage-sense input and reported in a 2byte register with 11bit (4.88mV) resolution.
On-chip temperature measurement is reported in a 2byte register with a resolution of 0.125C.
A standard I2C interface with software-programmable address gives the controlling microprocessor access to all data and status registers in the DS2745.The device operates with an active power consumption of less than 70uA and reverts to an ultralow power consumption of less than 1uA when in sleep mode.
This sleep mode conserves energy when the cell pack is not in use.
Typical applications for the DS2745 include cellular phones, GPS, PDAs and other handheld products.
The device is available in a tiny 8-pin microMAX package.
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