ADS1282IPW datasheet(29/52 Pages) TI

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ONE-SHOT OPERATION

OFFSET AND FULL-SCALE CALIBRATION

FinalOutputData=(Input

OFC[2:0])

FSC[2:0]

400000h

Standby

PerformingOne-ShotConversion

Standby

STANDBY

ADS1282Status

DRDY

DIN

DOUT

WAKEUP

(1)

STANDBY

Settled

Data

Modulator

AINP

AINN

Digital

Filter

OFC

FinalOutput

OutputData

Clippedto32Bits

FSCRegister

400000h

ADS1282

www.ti.com ........................................................................................................................................ SBAS418E – SEPTEMBER 2007 – REVISED OCTOBER 2008

REGISTERS

The ADS1282 can perform very power-efficient,

one-shot conversions using the STANDBY command

The conversion data can be scaled for offset and gain

while under software control. Figure 63 shows this

before yielding the final output code. As shown in

sequence. First, issue the STANDBY command to set

Figure 64, the output of the digital filter is first

the Standby mode.

subtracted by the offset register (OFC) and then

multiplied

the

full-scale

(FSC).

When ready to make a measurement, issue the

Equation 12 shows the scaling:

WAKEUP command. Monitor DRDY; when it goes

low, the fully settled conversion data are ready and

may be read directly in Read Data Continuous mode.

Afterwards,

issue

another

STANDBY

command.

(12)

When ready for the next measurement, repeat the

The values of the offset and full-scale registers are

cycle starting with another WAKEUP command.

set by writing to them directly, or they are set

automatically by calibration commands.

Note that the offset and full-scale calibrations apply to

specific PGA settings. When the PGA is changed,

these

registers

generally

require

recalculation.

Calibration is bypassed in the sinc filter mode.

(1) See Figure 55 and Table 11 for time to new data.

Figure 63. One-Shot Conversions Using the STANDBY Command

Figure 64. Calibration Block Diagram

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