Posted on Feb 5, 2014

Rechargeable lithium-ion (Li-ion) batteries are everywhere these days, powering everything from laptops and tablets to cell phones, MP3 players, digital cameras, and all sorts of portable electronics. But what`s the best way to charge them This app note looks at using an LPC111x MCU to do the job, because this low-cost yet high-performance microc

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ontroller can perform other housekeeping  tasks at the same time. Click here to access AN11139: Off-line Li-ion battery charger solution with the LPC111x family For some time now, rechargeable lithium-ion (Li-ion) batteries have been the power source of choice in a very wide range of portable electronics, and it`s easy to see why. They offer high power density, do a good job of holding a charge when not in use, and, unlike nickel-cadmium (NiCd) batteries, perform better over the longer term because they charge to their maximum energy capacity without suffering from memory effect . The choice to use a Li-ion battery may seem obvious, but deciding how to charge the battery can be a bit more complicated. There are several different charging methods to consider, some involving simple logic parts, others involving special power-management ICs, or a microcontroller. In the sample application described here, we use an NXP LPC111x for the charging function. Built around a power- and area-optimized Cortex-M0 core, the LPC111x is a low-cost yet high-performance option that is powerful enough to perform other housekeeping  tasks while charging takes place. The low-cost Cortex-M0 LPC111x family is equipped with up to 32 kB of flash and up to 4 kB of SRAM. The flash memory can be programmed in-circuit. Members of the LPC111x family have 10-bit ADCs, four timers (two 32-bit and two 16-bit timers), and a host of other peripherals,...

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