Interfacing DAC0-800 with 8085 -Free 8085 Microprocessor articles

INTERFACING OF DAC0-800 WITH 8085

The DAC0800 can be interfaced to 8085 system bus by using an 8-bit latch and the latch can be enabled by using one of the chip select signal generated for I/O devices. A simple schematic for interfacing DAC0800 with 8085 is,

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In this schematic the DAC0800 is interfaced using an 8-bit latch 74LS273 to the system bus.

The 3-to-8 decoder 74LS 138 is used to generate chip select signals for I/O devices.

The address lines A4, A5 and A6 are used as input to decoder.

The address line A7 and the control signal IO/M (low) are used as enable for decoder.

The decoder will generate eight chip select signals and in this the signal IOCS-7 is used as enable for latch of DAC.

The I/O address of the DAC is shown in table.

In order to convert a digital data to analog value, the processor has to load the data to latch.

The latch will hold the previous data until next data is loaded.

The DAC will take definite time to convert the data. The software should take care of loading successive data only after the conversion time.

The DAC 0800 produces a current output, which is converted to voltage output using Ito V converter.