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MCP3425 Datasheet(PDF) 10 Page - Microchip Technology |
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MCP3425 Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 30 page  MCP3425 DS22072A-page 10 © 2007 Microchip Technology Inc. 5.0 USING THE MCP3425 DEVICE 5.1 Operating Modes The user operates the device by setting up the device configuration register and reads the conversion data using serial I2C interface commands. The MCP3425 operates in two modes: (a) Continuous Conversion Mode or (b) One-Shot Conversion Mode (single conversion). The selection is made by setting the O/C bit in the Configuration Register. Refer to Section 5.2 “Configuration Register” for more information. 5.1.1 CONTINUOUS CONVERSION MODE (O/C BIT = 1) The MCP3425 device performs a Continuous Conversion if the O/C bit is set to logic “high”. Once the conversion is completed, 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 data. The device also 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. 5.1.2 ONE-SHOT CONVERSION MODE (O/C BIT = 0) Once the One-Shot Conversion (single conversion) Mode is selected, the device performs a 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. 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 cur- rent draw is only about one fourth of the draws in con- tinuous mode. In 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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