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8-channel 12-bit SPI ADC

MCP3208 Basic Circuit

Build a basic MCP3208 circuit with labeled pins, component values and connection guidance.

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MCP3208 in a circuit

A physical MCP3208 and a 3.3 V controller share a quiet supply.

MCP3208 CH0 pin1 receives a0to3.3V signal. VDD16 and reference15 use3.3V; grounds9and14 are common. Four color-coded SPI wires connect CS10 DIN11 DOUT12 SCLK13 to a3.3Vcontroller. A1µF capacitor bypasses supply.
One channel is measured per conversion. The same serial interface selects any of the eight inputs.

Connect it, step by step

Follow the component values and pin connections

Power and reference

Connect both VDD and VREF to 3.3 V, join the grounds and place the 1 µF bypass nearby.

Connect the serial bus

Use MOSI→DIN, DOUT→MISO, SCLK→SCLK and a separate chip-select line.

Select and decode

Send 06 00 00 to select single-ended CH0. Combine the twelve returned data bits; raise CS between measurements.

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