ADS1255IDB Burr-Brown Corporation, ADS1255IDB Datasheet - Page 31

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

MUX : Input Multiplexer Control Register (Address 01h)
Reset Value = 01h
Bits 7-4 PSEL3, PSEL2, PSEL1, PSEL0: Positive Input Channel (AIN
NOTE: When using an ADS1255 make sure to only select the available inputs.
Bits 3-0 NSEL3, NSEL2, NSEL1, NSEL0: Negative Input Channel (AIN
NOTE: When using an ADS1255 make sure to only select the available inputs.
ADCON: A/D Control Register (Address 02h)
Reset Value = 20h
Bit 7
Bits 6-5 CLK1, CLK0: D0/CLKOUT Clock Out Rate Setting
Bits 4-2 SDCS1, SCDS0: Sensor Detect Current Sources
The Sensor Detect Current Sources can be activated to verify the integrity of an external sensor supplying a signal to the
ADS1255/6. A shorted sensor produces a very small signal while an open-circuit sensor produces a very large signal.
Bits 2-0 PGA2, PGA1, PGA0: Programmable Gain Amplifier Setting
PSEL3
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BIT 7
BIT 7
0
0000 = AIN0 (default)
0001 = AIN1
0010 = AIN2 (ADS1256 only)
0011 = AIN3 (ADS1256 only)
0100 = AIN4 (ADS1256 only)
0101 = AIN5 (ADS1256 only)
0110 = AIN6 (ADS1256 only)
0111 = AIN7 (ADS1256 only)
1xxx = AINCOM (when PSEL3 = 1, PSEL2, PSEL1, PSEL0 are “don’t care”)
0000 = AIN0
0001 = AIN1 (default)
0010 = AIN2 (ADS1256 only)
0011 = AIN3 (ADS1256 only)
0100 = AIN4 (ADS1256 only)
0101 = AIN5 (ADS1256 only)
0110 = AIN6 (ADS1256 only)
0111 = AIN7 (ADS1256 only)
1xxx = AINCOM (when NSEL3 = 1, NSEL2, NSEL1, NSEL0 are “don’t care”)
Reserved, always 0 (Read Only)
00 = Clock Out OFF
01 = Clock Out Frequency = f
10 = Clock Out Frequency = f
11 = Clock Out Frequency = f
When not using CLKOUT, it is recommended that it be turned off. These bits can only be reset using the RESET pin.
00 = Sensor Detect OFF (default)
01 = Sensor Detect Current = 0.5 A
10 = Sensor Detect Current = 2 A
11 = Sensor Detect Current = 10 A
000 = 1 (default)
001 = 2
010 = 4
011 = 8
100 = 16
101 = 32
110 = 64
111 = 64
PSEL2
BIT 6
BIT 6
CLK1
PSEL1
CLK0
BIT 5
BIT 5
CLKIN
CLKIN
CLKIN
/4
/2
(default)
SDCS1
PSEL0
BIT 4
BIT 4
SDCS0
NSEL3
BIT 3
BIT 3
P
) Select
N
)Select
NSEL2
PGA2
BIT 2
BIT 2
SBAS288D − JUNE 2003 − REVISED AUGUST 2004
NSEL1
PGA1
BIT 1
BIT 1
ADS1255
ADS1256
NSEL0
PGA0
BIT 0
BIT 0
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