ADS1242 AND ADS1243
REGISTERS
The operation of the device is set up through individual
registers. Collectively, the registers contain all the informa-
tion needed to configure the part, such as data format,
multiplexer settings, calibration settings, data rate, etc. The
16 registers are shown in Table III.
ADDRESS
REGISTER
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
SETUP
MUX
ID
ID
ID
ID
BOCS
NSEL3
BIT ORDER
OSET3
DIO_3
PGA2
NSEL2
RANGE
OSET2
DIO_2
DIR_2
IO2
PGA1
NSEL1
DR1
PGA0
NSEL0
DR0
PSEL3
DRDY
SIGN
PSEL2
U/B
PSEL1
SPEED
OSET5
DIO_5
DIR_5
IO5
PSEL0
BUFEN
OSET4
DIO_4
DIR_4
IO4
ACR
ODAC
DIO
OSET6
DIO_6
DIR_6
IO6
OSET1
DIO_1
DIR_1
IO1
OSET0
DIO_0
DIR_0
IO0
DIO_7
DIR_7
IO7
DIR
DIR_3
IOCON
OCR0
OCR1
OCR2
FSR0
FSR1
FSR2
DOR2
DOR1
DOR0
IO3
OCR07
OCR15
OCR23
FSR07
FSR15
FSR23
DOR23
DOR15
DOR07
OCR06
OCR14
OCR22
FSR06
FSR14
FSR22
DOR22
DOR14
DOR16
OCR05
OCR13
OCR21
FSR05
FSR13
FSR21
DOR21
DOR13
FSR21
OCR04
OCR12
OCR20
FSR04
FSR12
FSR20
DOR20
DOR12
DOR04
OCR03
OCR11
OCR19
FSR03
FSR11
FSR19
DOR19
DOR11
DOR03
OCR02
OCR10
OCR18
FSR02
FSR10
FSR18
DOR18
DOR10
DOR02
OCR01
OCR09
OCR17
FSR01
FSR09
FSR17
DOR17
DOR09
DOR01
OCR00
OCR08
OCR16
FSR00
FSR08
FSR16
DOR16
DOR08
DOR00
TABLE III. Registers.
DETAILED REGISTER DEFINITIONS
SETUP (Address 00H) Setup Register
Reset Value = iiii0000
MUX (Address 01H) Multiplexer Control Register
Reset Value = 01H
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
NSEL1
bit 0
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
PSEL3
PSEL2
PSEL1
PSEL0
NSEL3
NSEL2
NSEL0
ID
ID
ID
ID
BOCS
PGA2
PGA1
PGA0
bit 7-4 PSEL3: PSEL2: PSEL1: PSEL0: Positive Channel
bit 7-4 Factory Programmed Bits
bit 3 BOCS: Burnout Current Source
Select
0000 = AIN0 (default)
0001 = AIN1
0010 = AIN2
0011 = AIN3
0100 = AIN4
0101 = AIN5
0110 = AIN6
0111 = AIN7
1111 = Reserved
0 = Disabled (default)
1 = Enabled
bit 2-0 PGA2: PGA1: PGA0: Programmable Gain Amplifier
Gain Selection
000 = 1 (default)
001 = 2
010 = 4
011 = 8
bit 3-0 NSEL3: NSEL2: NSEL1: NSEL0: Negative Channel
100 = 16
101 = 32
Select
0000 = AIN0
0001 = AIN1 (default)
0010 = AIN2
0011 = AIN3
0100 = AIN4
0101 = AIN5
0110 = AIN6
0111 = AIN7
1111 = Reserved
110 = 64
111 = 128
ADS1242, 1243
15
SBAS235H
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