Datasheet

Standby
Mode
Begin
Calibration
DataReady
AfterCalibration
t
STANDBY
t
SC_RDY
DRDY/DOUT 19
1
22 23 24 25
20 21
2 3 4
1
18 17 0 19
SCLK
ADS1230
SBAS366B –OCTOBER 2006–REVISED SEPTEMBER 2012 www.ti.com
STANDBY MODE WITH OFFSET- To force an offset-calibration with Standby mode, shift
CALIBRATION 25 SCLKs and bring the SCLK pin high to enter
Standby mode. Offset-calibration then begins after
Offset-calibration can be set to run immediately after
wake-up; Figure 29 shows the appropriate timing.
exiting Standby mode. This option is useful when the
Note the extra time needed after wake-up for
ADS1230 is put in Standby mode for long periods of
calibration before data are ready. The first data after
time, and offset-calibration is desired afterwards to
Standby mode with offset-calibration is fully settled
compensate for temperature or supply voltage
and can be used right away.
changes.
Figure 29. Standby Mode with Offset-Calibration Timing (can be used for single conversions)
SYMBOL DESCRIPTION MIN MAX UNITS
SPEED = 1 103 103 ms
Data ready after exiting Standby mode
t
SC_RDY
(1)
and calibration
SPEED = 0 803 803 ms
(1) Value given for f
CLK
= 4.9152MHz. For different f
CLK
frequencies, scale proportional to CLK period. Expect a ±3% variation when an
internal oscillator is used.
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