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List 1 (Continued)

LINE LOC OBJ SOURCE

129 409c f9 RETURN RTS

130 ;

131 ;Subroutine :– STORE

132 ;

133 409d 1214 STORE MOV R20,A ;Put MS Byte into even

134 409f 9b0a MOV A,@R10 ;address contained in R10

135 40a1 d30a INC R10 ;(R10)+1

136 40a3 1215 MOV R21,A ;Put LS Byte into odd

137 40a5 9b0a MOV A,@R10 ;address contained in R10

138 40a7 f9 RTS

139 .END

Opto-Isolated 12-Bit Data Acquisition System

The serial nature of the data flow between the TLC2543 analog-to-digital converter and the accompanying

microcontroller makes this ADC an ideal choice for isolated 12-bit data acquisition. Figure 10 shows an opto-isolated

system which uses four optocouplers to provide a 3-kV isolation barrier.

Note that the optocoupler which routes conversion result data from the TLC2543 to the microcontroller is a single device

and does not share the same piece of silicon with any of the other optocouplers used. This ensures that the full 3 kV of

isolation is maintained between the ADC and microcontroller.

The choice of VP0610 P-channel enhancement MOSFETs avoids the use of an extra inverter stage for each optocoupler

driver. In addition, the relatively low input capacitance of the VP0610 (typically 15 pF) allows data rates up to 100 kHz

to be achieved without the need for external buffers to be added at the outputs of the TLC2543 and TMS370.

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ADC 400F Spezifikationen Seite 13