參數(shù)資料
型號(hào)： ADS1256IDBR
英文描述： Very Low Noise, 24-Bit Analog-to-Digital Converter
中文描述： 極低噪聲，24位模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 36/39頁(yè)
文件大小： 427K
代理商： ADS1256IDBR
SBAS288D JUNE 2003 REVISED AUGUST 2004
www.ti.com
36
RREG: Read from Registers
Description:
Output the data from up to 11 registers starting with the register address specified as part of the command.
The number of registers read will be one plus the second byte of the command. If the count exceeds the remaining registers,
the addresses will wrap back to the beginning.
1st Command Byte: 0001
rrrr
where
rrrr
is the address of the first register to read.
2nd Command Byte: 0000
nnnn
where
nnnn
is the number of bytes to read – 1. See the Timing Characteristics for the
required delay between the end of the RREG command and the beginning of shifting data on DOUT: t
6
.
DOUT
DIN
0001 0001
0000 0001
1st Command
Byte
2nd Command
Byte
MUX
ADCON
Data
Byte
Data
Byte
t
6
Figure 33. RREG Command Example: Read Two Registers Starting from Register 01h (multiplexer)
WREG: Write to Register
Description:
Write to the registers starting with the register specified as part of the command. The number of registers that
will be written is one plus the value of the second byte in the command.
1st Command Byte: 0101
rrrr
where
rrrr
is the address to the first register to be written.
2nd Command Byte: 0000
nnnn
where
nnnn
is the number of bytes to be written – 1.
Data Byte(s): data to be written to the registers.
DIN
0101 0011
0000 0001
1st Command
Byte
2nd Command
Byte
DRATE Data
IO Data
Data
Byte
Data
Byte
Figure 34. WREG Command Example: Write Two Registers Starting from 03h (DRATE)
SELFCAL: Self Offset and Gain Calibration
Description:
Performs a self offset and self gain calibration. The Offset Calibration Register (OFC) and Full-Scale
Calibration Register (FSC) are updated after this operation. DRDY goes high at the beginning of the calibration. It goes
low after the calibration completes and settled data is ready. Do not send additional commands after issuing this command
until DRDY goes low indicating that the calibration is complete.
SELFOCAL: Self Offset Calibration
Description:
Performs a self offset calibration. The Offset Calibration Register (OFC) is updated after this operation. DRDY
goes high at the beginning of the calibration. It goes low after the calibration completes and settled data is ready. Do not
send additional commands after issuing this command until DRDY goes low indicating that the calibration is complete.
SELFGCAL: Self Gain Calibration
Description:
Performs a self gain calibration. The Full-Scale Calibration Register (FSC) is updated with new values after
this operation. DRDY goes high at the beginning of the calibration. It goes low after the calibration completes and settled
data is ready. Do not send additional commands after issuing this command until DRDY goes low indicating that the
calibration is complete.
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