Rainbow-electronics MAX1230 Bedienungsanleitung PDF herunterladen (Seite 18)

MAX1226/MAX1228/MAX1230

12-Bit 300ksps ADCs with FIFO,

Temp Sensor, Internal Reference

18 ______________________________________________________________________________________

Initiate a scan by writing a byte to the conversion regis-

ter. The MAX1226/MAX1228/MAX1230 then power up,

scan all requested channels, store the results in the

FIFO, and shut down. After the scan is complete, EOC

is pulled low and the results are available in the FIFO. If

a temperature measurement is requested, the tempera-

ture result precedes all other FIFO results. EOC stays

low until CS is pulled low again.

Externally Clocked Acquisitions and

Conversions Using the Serial Interface

Performing Conversions in Clock Mode 11

In clock mode 11, acquisitions and conversions are ini-

tiated by writing to the conversion register and are per-

formed one at a time using the SCLK as the conversion

clock. Scanning and averaging are disabled, and the

conversion result is available at DOUT during the con-

version. See Figure 7 for clock mode 11 timing.

DOUT

SCLK

CNVST

EOC

(CONVERSION2)

MSB1 LSB1 MSB2

(ACQUISITION1)

(ACQUISITION2)

(CONVERSION1)

REQUEST MULTIPLE CONVERSIONS BY SETTING CNVST LOW FOR EACH CONVERSION.

Figure 5. Clock Mode 01

(UP TO 514 INTERNALLY CLOCKED ACQUISITIONS AND CONVERSIONS)

MSB1 LSB1 MSB2

(CONVERSION BYTE)

DOUT

SCLK

DIN

EOC

THE CONVERSION BYTE BEGINS THE ACQUISITION. CNVST IS NOT REQUIRED.

Figure 6. Clock Mode 10

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Rainbow-electronics MAX1230 Bedienungsanleitung Seite 18