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ATMEGA2561V-8MU 产品设计参考手册 - ATMEL（爱特美尔）
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ATMEL（爱特美尔）
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8位微控制器
封装:
VFQFN-64
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ATMEGA2561V-8MU数据手册
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Atmel AT01244: DALI Slave Reference Design [APPLICATION NOTE]
42071B−AVR−07/2013
4
2. Hardware Modules
As previously described, there are mainly three hardware modules.
2.1 DALI hardware interface
DALI hardware interface bridges the voltage level between DALI bus and microcontroller. According to the DALI
protocol, the HIGH level is 9.5V to 22.5V, and the LOW level is -6.5V to 6.5V. The special logic level should be
converted to the logic which MCU can accept. The interface logic should be 0 to 5V for the MCU (Atmel ATmega88PA)
used in this design.
Figure 2-1. DALI hardware interface.
Rectify
Bridge
DALI
Bus
Optocoupler
Optocoupler
Comparator
Current
Source
MCU Rx
MCU Tx
Two optocouplers are used to isolate the voltage level between the DALI bus and microcontroller.
Using the comparator in above circuit has advantage over other simplified design in:
• Suitable for all working temperature range
• Trim the input waveform of signal for MCU
• Tolerant the difference of components for mass production
2.2 Microcontroller
ATmega88PA is one of the most popular devices in the Atmel MCU family. It is used as the main microcontroller in this
reference design. ATmega88PA handles the commands and data which comes from the DALI interface part.
2.3 LED driver
Atmel MSL2041 is used as the LED driver in this design. It drives and controls the LEDs based on the input PWM signal
from MCU. It also monitors the current and voltage of LEDs and feeds back to MCU the error status if error occurs.
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