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M66503ASP Datasheet(PDF) 4 Page - Mitsubishi Electric Semiconductor |
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M66503ASP Datasheet(HTML) 4 Page - Mitsubishi Electric Semiconductor |
4 / 8 page 4 MITSUBISHI 〈DIGITAL ASSP〉 M66503ASP/AGP 16-BIT CONSTANT CURRENT LED DRIVER with SHIFT REGISTER AND LATCH OPERATION 1. LED Drive Current Settings The M66503A has an internal power supply, which pro- vides a constant current to each bit output. The output value of the constant current is set by means of a load re- sistor, RC,connected between the RC pin and GND and is approximated by the equation below. IO (Qn) =5·VCC/(2·RC +100) 2. Switching Operation If the output data of the latch is “H”, LED lights up. The value of the LED drive current is IO(Qn). If the output data of the latch is “L”, LED goes off, and the LED drive current becomes nearly zero, irrespective of the value of IO(Qn). 3. How to Use the OEA and OEB Inputs If OEA = “L” and OEB = “L”, all output currents are turned off. Accordingly, it is possible to prevent a large current from flowing through LESs by, for example, fixing both OEA and OEB to “L” until VCC, after turned on, reaches a steady state. If OEA =“H”, all output currents turn on. This function facilitates the checking of LEDs for failure. When OEA =“L” and OEB =“H”, each output current turns on and off according to the output data of the latch. 4. VCC and GND Pins Pins related to the power supply function are VCC and GNDs 1-5 (GNDs 1-3 for the M66503AGP). The role of these pins in terms of the internal circuits are as follows. VCC : commonly used by both digital and analog circuits GND 1 : used by digital circuits GNDs 2-5 (2-3) : used by analog circuits In practical wiring, the following should be noted. (1) Secure as much width as possible for conductors and avoid lengthy wiring. (2) Allocate electrolytic capacitors for stable voltage near VCC and GNDs 2-5 (2-3). (3) Allocate by-pass capacitor near VCC and GND1. |
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