Song Quality Improvement Using the DAC on AT89C51SND1 Reference Design
Signal to noise ratio can be improved by controlling the song level both with the external
DAC and with the AT89C51SND1 song level SFR register. To control the song level with the DAC UDA1330ATS, the L3 mode must be used. This application note gives some information on activating/de-activating the L3 mode of DAC UDA1330ATS (or compatible hardware) for the AT89C51SND1 Reference Design. Application Modes.
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Smart Battery Reference Design
Rechargeable Lithium-Ion (Li-Ion) batteries are widely used in portable electronics such as cell phones, digital cameras and laptop computers. This is mainly due to the high energy to weight ratio of these batteries. Maximizing the lifetime and energy storage of Li-Ion batteries requires careful monitoring and control of the charge and discharge cycles. Incorrect use may even pose a threat to safety, as Li-Ion batteries can explode under extreme conditions. For these reasons intelligent batteries - smart batteries - have been introduced.
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MP3 Player Reference Design Based on AT89C51SND1 Microcontroller
When connected to a PC using a USB cable, the player can be accessed by Flexible In-System Programming (FLIP) software. To enter by software in the ISP bootloader of the player, press the Function button while the USB cable is plugged into the PC (the ISP software condition is checked only during power ON Reset).
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ATAVRUSBRF01 USB 2.4 GHz Reference Design
AVRUSBRF01 is based on Atmel AT90USB162 microcontroller, which allows connection to PC through USB, and nRF24L01 transceiver from Nordic VLSI. The kit contains two identical AVR USB RF modules. They can connect to two different USB ports to establish wireless communication and evaluate the solution. They can also communicate with wireless peripherals derived from this reference design. To help with evaluation and development, the modules include two push buttons for hardware reset, in-system programming and extra functions, two LEDs for monitoring activity and a 6-pin header to connect development tools or other peripheral functions. The PCB size is only 3.8x1.6 cm2, which is small enough to be used without change for many applications. If necessary, size can be further reduced by removing the extra features provided for evaluation and development.
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AT86RF231 PCB reference design for antenna diversity
The AT86RF231 diversity board demonstrates the capabilities of the 802.15.4 compliant 2.4 GHz radio transceiver AT86RF231. With the high performance ATmega1281V AVR microcontroller it serves as a full function network node that is capable of hosting a MAC implementation driven by two AAA batteries for more than one year. Two ceramic chip antennas increase the link budget in a typical indoor scenario with multipath fading effects.
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