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CY8CLED16P01-OCD Datasheet(PDF) 10 Page - Cypress Semiconductor |
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CY8CLED16P01-OCD Datasheet(HTML) 10 Page - Cypress Semiconductor |
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10 / 58 page  CY8CLED16P01 Document Number: 001-49263 Rev. *J Page 10 of 58 3.5 Digital Communication Most HB LED-based lighting systems require some form of digital communication to send and receive data to and from the light fixtures to control them. The CY8CLED16P01 is a one-device solution for HB LED lighting control and powerline communication. However, the CY8CLED16P01 supports several other data communication protocols, apart from powerline communication. These are listed in Table 3-1. Some of the hardware is dedicated for a protocol and does not use any digital blocks. Some protocols use digital blocks to implement the communication. A DMX512 protocol receiver can be implemented using two digital blocks. This is a standard protocol that is common in stage and concert lighting systems. The receiver has a software programmable address and programmable number of channels that it can control. A typical DMX512 receiver implementation (developed by Cypress) controlling three LED channels consumes five digital blocks (three for the LED modulators). Table 3-1. Digital Communication Resource Usage DALI is another lighting communication protocol that is common for large commercial buildings. The DALI slave can be imple- mented in EZ-Color consuming six digital blocks (three for the DALI slave and three to modulate 3 LED channels). The three blocks used to implement DALI need not be communication blocks as the Manchester encoding is performed in the software. Apart from these specific lighting communication protocols, the industry standard communication protocols such as I2C, UART, and SPI can be implemented in any of the devices in the family. As examples, SPI can be used to interface to external WUSB devices, while I2C can be used to interface to external microcon- trollers. Table 3-1 also shows the number of digital block resources that each type of communication block consumes. 3.6 Other Functions The CY8CLED16P01 is capable of functions other than those previously discussed. Most functions that can be implemented with a standard microcontroller can be also implemented with the CY8CLED16P01. Similar to regular PSoC devices, the CY8CLED16P01 also has dynamic reconfiguration ability. This is a technique that enables the device’s digital and analog resources to be reused for different functions that may not be available simultaneously. For instance, consider the application to remotely control LED color/intensity (with current feedback) over powerlines using the CY8CLED16P01 for both PLC and LED color control. The PLC functionality and the current feedback do not necessarily need to happen at the same time. Therefore, the digital and analog blocks that implement the PLC functionality can dynamically reconfigure into resources that implement current feedback. By doing this, the CY8CLED16P01 device gets more functionality out of a fixed number of resources than would otherwise be possible. The only constraint on this technique is the amount of Flash and SRAM size required for the code to implement these functions. For more details on dynamic reconfiguration, refer to application note AN2104, PSoC Dynamic Reconfiguration. Data Protocol Digital Blocks Communication Digital Blocks DMX512 (Receiver) 2 1 DALI (Slave) 3 0 I2C Master or Slave 0 0 Half Duplex UART 1 1 SPI Master or Slave 1 1 |
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