ADS1230
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SBAS366–OCTOBER 2006
STANDBY MODE WITH
OFFSET-CALIBRATION
To force an offset-calibration with Standby mode,
shift 25 SCLKs and bring the SCLK pin high to enter
Standby mode. Offset-calibration then begins after
wake-up; Figure 29 shows the appropriate timing.
Note the extra time needed after wake-up for
calibration before data are ready. The first data after
Standby mode with offset-calibration is fully settled
and can be used right away.
Offset-calibration can be set to run immediately after
exiting Standby mode. This option is useful when the
ADS1230 is put in Standby mode for long periods of
time, and offset-calibration is desired afterwards to
compensate for temperature or supply voltage
changes.
Data Ready
Standby
Mode
After Calibration
DRDY/DOUT
SCLK
19
18
17
0
19
1
Begin
Calibration
2
3
4
1
20
21
22
23
24
25
tSTANDBY
tSC_RDY
Figure 29. Standby Mode with Offset-Calibration Timing (can be used for single conversions)
SYMBOL
DESCRIPTION
MIN
103
803
MAX
103
UNITS
ms
SPEED = 1
SPEED = 0
Data ready after exiting Standby mode
and calibration
(1)
tSC_RDY
803
ms
(1) Value given for fCLK = 4.9152MHz. For different fCLK frequencies, scale proportional to CLK period. Expect a ±3% variation when an
internal oscillator is used.
18
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