Making a DALI network with ARM® 32-bit Cortex™-M0 microcontrollers (LPC1100XL)

System notes

Controller side:
• The LPC1100XL (up to 50 MHz – 45 DMIPS) offers enough performance to integrate DALI message coding/decoding and PWM generation in a single chip
• Industry-leading low active power consumption of 110 uA/MHz for bus-powered devices
• Storage of scene settings in non-volatile memory using EEPROM emulation in flash, or integrated EEPROM in LPC11E00 series
• Up to four 16-bit and 32-bit timers, generating up to 11 PWM signals to control and dim the ballast
• Reduced development complexity – software can be written in C
• Reduced bill of materials – significant cost savings through Cortex-M0 architecture, plus many built-in peripherals to interface with lighting drivers and network in LPC1100XL

Power stage:
• LED dimming using the PWM input of the NXP UBA3070 DC-to-DC LED driver with up to 98% efficiency
• SSL4101 provides mains isolation for both the RGB LED power stage and the DALI wires
• Low component count and high efficiency through integrated PFC and flyback control functionality
• GreenChip TEA1721 buck converter supplies LPC1100XL with high efficiency; no-load power consumption levels Implementation example (OM13026 board):
•  Contains isolated physical layer for the DALI bus with a Cortex M0 LPC111x microcontroller for the DALI protocol handling, and many I/O functions to steer external lighting drivers for solid state or compact fluorescent lighting applications
• Schematics, gerbers and BOM also available to speed up development
• Up to four PWM signals available to independently drive different lighting units
• Frequency and resolution of the signals is software programmable
• ON_OFF signal can be used independently from the PWM signals to switch a lighting driver into an OFF or ON state
• I2C-bus pins can be used to externally connect other devices like EEPROM or a temperature sensor
• Analog A/D input is available via pin 8
• IO signal is left open for the end user
• UART, I2C and A/D converter functionality not included in the software release

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