MCP3551-ESLASHMS datasheet(24/36 Pages) MICROCHIP

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MCP3550/1/3

DS21950E-page 24

5.4.1

READY FUNCTION OF SDO/RDY

PIN IN CONTINUOUS CONVERSION

MODE

The device enters Continuous Conversion mode if no

rising edge of CS is seen during tCONV and

consecutive conversions ensue. SDO/RDY will be

high, indicating that a conversion is in process. When

a conversion is complete, SDO/RDY will change to a

Low state. With the Low state of SDO/RDY after this

first conversion, the conversion data can be accessed

with the combination of SCK and SDO/RDY. If the data

ready event happens during the clocking out of the

data, the data ready bit will be displayed after the

complete 24-bit word communication (i.e., the data

ready event will not interrupt a data transfer).

If 24 bits of data are required from this conversion, they

must be accessed during this communication. You can

terminate data transition by bringing CS high, but the

remaining data will be lost and the converter will go into

Shutdown mode. Once the data has been transmitted

by the converter, the SDO/RDY pin will remain in the

LSB state until the 25th falling edge of SCK. At this

point, SDO/RDY is released from the Data Acquisition

mode and changed to the RDY state.

5.4.2

2-WIRE CONTINUOUS

CONVERSION OPERATION,

(CS TIED PERMANENTLY LOW)

It is possible to use only two wires to communicate with

the MCP3550/1/3 devices. In this state, the device is

always in Continuous Conversion mode, with internal

conversions continuously occurring. This mode can be

entered by having CS low during power-up or changing

it to a low position after power-up. If CS is low at power-

up, the first conversion of the converter is initiated

approximately 300 µs after the power supply has

stabilized.

Note:

The RDY state is not latched to CS in this

mode; the RDY flag dynamically updates

on the SDO/RDY pin and remains in this

state until data is clocked out using the

SCK pin.

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