![]() ![]() ![]() This triggers the U2 555 timer via U1a and starts a (R2 + R3)C3 ln(3) = 78.1µs = 9T conversion cycle, driving U1b to isolate the C2 hold capacitor (which holds the previous conversion result) and connect the C1 sample capacitor to the R1 input integration resistor. Serial transmission of bytes (at T = 8.68 µs = 115200 baud) for DA conversion follows standard UART formatting and begins with a ‘0’ start bit. Here’s how it works.įigure 2 The SDD with 5V asynchronous serial data, similar to a ♜ UART output.įigure 3 The SDD conversion cycle timing for 5V logic levels.
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