ADS1218_14 Datasheet, PDF (25/45 Pages) Texas Instruments – 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory

ADS1218
www.ti.com
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
DEC0 (Address 08_H) Decimation Register (least significant 8 bits)
Reset value is set by Flash memory page 0. Factory programmed to 80_H.
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
DEC07
DEC06
DEC05
DEC04
DEC03
DEC02
DEC01
DEC00
The decimation value is defined with 11 bits for a range of 20 to 2047. This register is the least significant 8 bits. The 3 most significant bits
are contained in the M/DEC1 register.
M/DEC1 (Address 09_H) Mode and Decimation Register
Reset value is set by Flash memory page 0. Factory programmed to 07_H.
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
DRDY
U/B
SMODE1
SMODE0
WREN
DEC10
DEC09
DEC08
bit 7 DRDY: Data Ready (Read Only)
This bit duplicates the state of the DRDY pin.
bit 6 U/B: Data Format
0 = Bipolar
1 = Unipolar
U/B
ANALOG INPUT
0
+FS
Zero
–FS
1
+FS
Zero
–FS
DIGITAL OUTPUT
0x7FFFFF
0x000000
0x800000
0xFFFFFF
0x000000
0x000000
bits 5-4
bit 3
bits 2-0
SMODE1: SMODE0: Settling Mode
00 = Auto
01 = Fast Settling filter
10 = Sinc2 filter
11 = Sinc3 filter
WREN: Flash Write Enable
0 = Flash Writing Disabled
1 = Flash Writing Enabled
This bit and the WREN pin must both be enabled in order to write to the Flash memory.
DEC10: DEC09: DEC08: Most Significant Bits of the Decimation Value
OCR0 (Address 0A_H) Offset Calibration Coefficient (least significant byte)
Reset value is set by Flash memory page 0. Factory programmed to 00_H.
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
OCR07
OCR06
OCR05
OCR04
OCR03
OCR02
OCR01
OCR00
25