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ADS1110A2IDBVR Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza ADS1110A2IDBVR
Descripción Electrónicos  16-Bit ANALOG-TO-DIGITAL CONVERTER with Onboard Reference
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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ADS1110A2IDBVR Datasheet(HTML) 11 Page - Texas Instruments

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ADS1110
SBAS276A − MARCH 2003 − REVISED NOVEMBER 2003
www.ti.com
11
CONFIGURATION REGISTER
The 8-bit configuration register can be used to control the
ADS1110’s operating mode, data rate, and PGA settings.
The configuration register format is shown in Table 5. The
default setting is 8CH.
BIT
7
6
5
4
3
2
1
0
NAME
ST/DRDY
0
0
SC
DR1
DR0
PGA1
PGA0
DEFAULT
1
0
0
0
1
1
0
0
Table 5. Configuration Register
Bit 7: ST/DRDY
The meaning of the ST/DRDY bit depends on whether it is
being written to or read from.
In single conversion mode, writing a 1 to the ST/DRDY bit
causes a conversion to start, and writing a 0 has no effect.
In continuous conversion mode, the ADS1110 ignores the
value written to ST/DRDY.
When read, ST/DRDY indicates whether the data in the
output register is new data. If ST/DRDY is 0, the data just
read from the output register is new, and has not been read
before. If ST/DRDY is 1, the data just read from the output
register has been read before.
The ADS1110 sets ST/DRDY to 0 when it writes data into
the output register. It sets ST/DRDY to 1 after any of the
bits in the configuration register have been read. (Note that
the read value of the bit is independent of the value written
to this bit.)
In
continuous-conversion
mode,
use
ST/DRDY to
determine when new conversion data is ready. If
ST/DRDY is 1, the data in the output register has already
been read, and is not new. If it is 0, the data in the output
register is new, and has not yet been read.
In single-conversion mode, use ST/DRDY to determine
when a conversion has completed. If ST/DRDY is 1, the
output register data is old, and the conversion is still in
process; if it is 0, the output register data is the result of the
new conversion.
Note that the output register is returned from the ADS1110
before the configuration register. The state of the
ST/DRDY bit applies to the data just read from the output
register, and not to the data from the next read operation.
Bits 6−5: Reserved
Bits 6 and 5 must be set to zero.
Bit 4: SC
SC controls whether the ADS1110 is in continuous
conversion or single conversion mode. When SC is 1, the
ADS1110 is in single conversion mode; when SC is 0, the
ADS1110 is in continuous conversion mode. The default
setting is 0.
Bits 3−2: DR
Bits 3 and 2 control the ADS1110’s data rate, as shown in
Table 6.
DR1
DR0
DATA RATE
0
0
240SPS
0
1
60SPS
1
0
30SPS
1(1)
1(1)
15SPS(1)
(1) Default setting.
Table 6. DR Bits
Bits 1−0: PGA
Bits 1 and 0 control the ADS1110’s gain setting, as shown
in Table 7.
PGA1
PGA0
GAIN
0(1)
0(1)
1(1)
0
1
2
1
0
4
1
1
8
(1) Default setting.
Table 7. PGA Bits


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