ADS1255IDB Burr-Brown Corporation, ADS1255IDB Datasheet - Page 30

• Manufacturer Part Number: ADS1255IDB
• Description: Very Low Noise/ 24-Bit Analog-to-Digital Converter
• Manufacturer: Burr-Brown Corporation

ADS1255
ADS1256
SBAS288D − JUNE 2003 − REVISED AUGUST 2004
REGISTER MAP
The operation of the ADS1255/6 is controlled through a set of registers. Collectively, the registers contain all the information
needed to configure the part, such as data rate, multiplexer settings, PGA setting, calibration, etc., and are listed in
Table 23.
STATUS : STATUS REGISTER (ADDRESS 00h)
Reset Value = x1h
Bits 7-4 ID3, ID2, ID1, ID0 Factory Programmed Identification Bits (Read Only)
Bit 3
Bit 2
Bit 1
Bit 0
30
ADDRESS
0Ah
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
BIT 7
ID
ORDER: Data Output Bit Order
0 = Most Significant Bit First (default)
1 = Least Significant Bit First
Input data is always shifted in most significant byte and bit first. Output data is always shifted out most significant
byte first. The ORDER bit only controls the bit order of the output data within the byte.
ACAL: Auto-Calibration
0 = Auto-Calibration Disabled (default)
1 = Auto-Calibration Enabled
When Auto-Calibration is enabled, self-calibration begins at the completion of the WREG command that changes
the PGA (bits 0-2 of ADCON register), DR (bits 7-0 in the DRATE register) or BUFEN (bit 1 in the STATUS register)
values.
BUFEN: Analog Input Buffer Enable
0 = Buffer Disabled (default)
1 = Buffer Enabled
DRDY: Data Ready (Read Only)
This bit duplicates the state of the DRDY pin.
REGISTER
STATUS
ADCON
DRATE
OFC0
OFC1
OFC2
FSC0
FSC1
FSC2
MUX
IO
BIT 6
ID
RESET
VALUE
01 H
20 H
F0 H
E0 H
x1 H
xx H
xx H
xx H
xx H
xx H
xx H
BIT 5
ID
OFC07
OFC15
OFC23
PSEL3
FSC07
FSC15
FSC23
BIT 7
DIR3
DR7
ID3
0
Table 23. Register Map
BIT 4
ID
OFC06
OFC14
OFC22
PSEL2
FSC06
FSC14
FSC22
CLK1
BIT 6
DIR2
DR6
ID2
OFC05
OFC13
OFC21
PSEL1
FSC05
FSC13
FSC21
CLK0
BIT 5
DIR1
DR5
ID1
ORDER
BIT 3
SDCS1
PSEL0
OFC04
OFC12
OFC20
FSC04
FSC12
FSC20
BIT 4
DIR0
DR4
ID0
ACAL
BIT 2
ORDER
SDCS0
OFC03
OFC19
NSEL3
OFC11
FSC03
FSC19
FSC11
BIT 3
DIO3
DR3
OFC02
OFC10
OFC18
NSEL2
FSC02
FSC10
FSC18
ACAL
PGA2
BIT 2
DIO2
DR2
BUFEN
BIT 1
BUFEN
NSEL1
OFC01
OFC09
OFC17
FSC01
FSC09
FSC17
PGA1
BIT 1
DIO1
DR1
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DRDY
BIT 0
NSEL0
OFC00
OFC08
OFC16
FSC00
FSC08
FSC16
DRDY
PGA0
BIT 0
DIO0
DR0