Datasheet

ADS1212, 1213
20
SBAS064A
DF (Data Format) Bit—The DF bit controls the format of
the output data, either Two’s Complement or Offset Binary,
as follows:
DF FORMAT ANALOG INPUT DIGITAL OUTPUT
0 Twos +Full-Scale 7FFFFF
H
Default
Complement Zero 000000
H
Full-Scale 800000
H
1 Offset Binary +Full-Scale FFFFFF
H
Zero 800000
H
Full-scale 000000
H
These two formats are the same for all bits except the most
significant, which is simply inverted in one format vs the
other. This bit only applies to the Data Output Register—it
has no effect on the other registers.
U/B (Unipolar) Bit—The U/B bit controls the limits im-
posed on the output data, as follows:
U/B MODE LIMITS
0 Bipolar None Default
1 Unipolar Zero to +Full-Scale only
The particular mode has no effect on the actual full-scale
range of the ADS1212/13, data format, or data format vs
input voltage. In the bipolar mode, the ADS1212/13 oper-
ates normally. In the unipolar mode, the conversion result is
limited to positive values only (zero included).
This bit only controls what is placed in the Data Output
Register. It has no effect on internal data. When cleared, the
very next conversion will produce a valid bipolar result.
BD (Byte Order) Bit—The BD bit controls the order in
which bytes of data are read, either most significant byte
first or least significant byte, as follows:
SDL (Serial Data Line) Bit—The SDL bit controls which
pin on the ADS1212/13 will be used as the serial data output
pin, either SDIO or SDOUT, as follows:
BD BYTE ACCESS ORDER
0 Most Significant Default
to Least Significant Byte
1 Least Significant
to Most Significant Byte
Note that when BD is clear and a multi-byte read is initiated,
A3-A0 of the Instruction Register is the address of the most
significant byte and subsequent bytes reside at higher ad-
dresses. If BD is set, then A3-A0 is the address of the least
significant byte and subsequent bytes reside at lower ad-
dresses. The BD bit only affects read operations; it has no
effect on write operations.
MSB (Bit Order) Bit—The MSB bit controls the order in
which bits within a byte of data are read, either most
significant bit first or least significant bit, as follows:
MSB BIT ORDER
0 Most Significant Bit First Default
1 Least Significant Bit First
The MSB bit only effects read operations; it has no affect on
write operations.
SDL SERIAL DATA OUTPUT PIN
0 SDIO Default
1 SDOUT
If SDL is LOW, then SDIO will be used for both input and
output of serial data—see the Timing section for more
details on how the SDIO pin transitions between these two
states. In addition, SDOUT will remain in a tri-state condi-
tion at all times.
Important Note: Since the default condition is SDL LOW,
SDIO has the potential of becoming an output once every
data output cycle if the ADS1212/13 is in the Master Mode.
This will occur until the Command Register can be written
and the SDL bit set HIGH. See the Interfacing section for
more information.
DRDY (Data Ready) Bit—The DRDY bit is a read-only bit
which reflects the state of the ADS1212/13’s DRDY output
pin, as follows:
DRDY MEANING
0 Data Ready
1 Data Not Ready
DSYNC (Data Synchronization) Bit—The DSYNC bit is
a write-only bit which occupies the same location as DRDY.
When a ‘one’ is written to this location, the effect on the
ADS1212/13 is the same as if the DSYNC input pin had
been taken LOW and returned HIGH. That is, the modulator
count for the current conversion cycle will be reset to zero.
The DSYNC bit is provided in order to reduce the number of
interface signals that are needed between the ADS1212/13
and the main controller. Consult “Making Use of DSYNC”
in the Serial Interface section for more information.
MD2-MD0 (Operating Mode) Bits—The MD2-MD0 bits
initiate or enable the various calibration sequences, as follows:
DSYNC MEANING
0 No Change in Modulator Count
1 Modulator Count Reset to Zero
MD2 MD1 MD0 OPERATING MODE
0 0 0 Normal Mode
0 0 1 Self-Calibration
0 1 0 System Offset Calibration
0 1 1 System Full-Scale Calibration
1 0 0 Pseudo System Calibration
1 0 1 Background Calibration
1 1 0 Sleep
1 1 1 Reserved
The Normal Mode, Background Calibration Mode, and
Sleep Mode are permanent modes and the ADS1212/13 will
remain in these modes indefinitely. All other modes are
temporary and will revert to Normal Mode once the appro-
priate actions are complete. See the Calibration and Sleep
Mode sections for more information.