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
Click here to download the full size of the above Circuit.
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,...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: