MCP3551-ESLASHMS datasheet(18/30 Pages) MICROCHIP

18 / 30 page

MCP3550/1/3

DS21950D-page 18

5.2

Controlling Internal Conversions

and the Internal Oscillator

During Shutdown mode, on the falling edge of CS, the

conversion process begins. During this process, the

internal oscillator clocks the delta-sigma modulator and

the SINC filter until a conversion is complete. This

conversion time is tCONV and the timing is shown in

Figure 5-2. At the end of tCONV, the digital filter has

settled completely and there is no latency involved with

the digital SINC filter of the MCP3550/1/3.

The two modes of conversion for the MCP3550/1/3

devices

are Single Conversion and Continuous

Conversion. In Single Conversion mode, a consecutive

conversion will not automatically begin. Instead, after a

single conversion is complete and all four filters have

settled, the device puts the data into the output register

and enters shutdown.

In Continuous Conversion mode, a consecutive

conversion will be automatic. In this mode, the device

is continuously converting, independent of the serial

interface. The most recent conversion data will always

be available in the Output register.

When the device exits Shutdown, there is an internal

power-up delay that must be observed.

FIGURE 5-2:

Single Conversion Mode.

FIGURE 5-3:

Continuous Conversion Mode.

Int. Osc

tCONV

Sleep

Shutdown

SCK (opt)

SDO/RDY

Hi-Z

x24

Int. Osc

tCONV

Shutdown

SCK (opt)

tCONV

SDO/RDY

Hi-Z

x24

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