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IRPLDIM2A Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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IRPLDIM2A Datasheet(HTML) 9 Page - List of Unclassifed Manufacturers |
9 / 15 page www.irf.com 9 IRPLDIM2a Receive signal RB1 RB0 Communications-enable Receive-drive signal Fig. 8 Dali and Micro-Conttoller signals Shutdown and Low Power With shutdown there are some unique power conditions. With the shutdown line low and the lamp ignited, the PIC16F628 derives its power from the charge pump of the IR21592. The charge pump provides enough current Fig. 9 Communications signal with the lamp off Receive signal RB1 RB0 Communications-enable Receive-drive signal SD pin IR21592 LO pin IR21592 for the microcontroller to run at its internal frequency of 4MHz during normal operation. When the shutdown line is asserted the IR21592 is disabled, and the charge pump is no longer functioning. Current is drawn directly from the high voltage DC line through a high value re- sistor. The micro controller is put to sleep during this time to minimize current draw and power dissipation. To receive data, which requires significant current, the PIC16F628 wakes up and starts the charge pump of the IR21592 long enough to process the command, typi- cally less than 25ms, but not long enough to ignite the lamp (see waveforms in Figure 9). Doing this unique management minimizes power dissipation during shut- down. |
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