MCP3425 datasheet(13/38 Pages) MICROCHIP

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DS22072B-page 13

MCP3425

5.0

USING THE MCP3425 DEVICE

5.1

Operating Modes

The user operates the device by setting up the device

configuration register using a write command (see

Figure 5-2) and reads the conversion data using a read

command (see Figure 5-3). The device operates in two

modes: (a) Continuous Conversion Mode or (b) One-

Shot Conversion Mode (single conversion). This mode

selection is made by setting the O/C bit in the

Configuration

Refer

Section 5.2

“Configuration Register” for more information.

5.1.1

CONTINUOUS CONVERSION

MODE (O/C BIT = 1)

The device performs a Continuous Conversion if the O/

C bit is set to logic “high”. Once the conversion is

completed, RDY bit is toggled to ‘0’ and the result is

placed at the output data register. The device

immediately begins another conversion and overwrites

the output data register with the most recent result. The

device clears the data ready flag (RDY bit = 0) when

the conversion is completed. The device sets the ready

flag bit (RDY bit = 1), if the latest conversion result has

been read by the Master.

• When writing configuration register:

- Setting RDY bit in continuous mode does not

affect anything

• When reading conversion data:

- RDY bit = 0 means the latest conversion

result is ready

- RDY bit = 1 means the conversion result is

not updated since the last reading. A new

conversion is under processing and the RDY

bit will be cleared when the new conversion

result is ready

5.1.2

ONE-SHOT CONVERSION MODE

(O/C BIT = 0)

Once the One-Shot Conversion (single conversion)

Mode is selected, the device performs only one

conversion, updates the output data register, clears the

data ready flag (RDY = 0), and then enters a low power

standby mode. A new One-Shot Conversion is started

again when the device receives a new write command

with RDY = 1.

• When writing configuration register:

- The RDY bit needs to be set to begin a new

conversion in one-shot mode

• When reading conversion data:

- RDY bit = 0 means the latest conversion

result is ready

- RDY bit = 1 means the conversion result is

not updated since the last reading. A new

conversion is under processing and the RDY

bit will be cleared when the new conversion is

done

This One-Shot Conversion Mode is recommended for

low power operating applications. During the low

current standby mode, the device consumes less than

1 µA typical. For example, if the device converts only

one time per second with 16 bit resolution, the total

current draw is only about one fourth of the draws in

continuous

mode.

this

example,

the

device

consumes approximately 9.7 µA (= ~145 µA/15 SPS),

if the device performs only one conversion per second

(1 SPS) in 16-bit conversion mode with 3V power

supply.

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