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SBAS418I – SEPTEMBER 2007 – REVISED MARCH 2015
9.28.1 Ofc[2:0] Registers
9.28.2 FSC[2:0] Registers
The offset calibration is a 24-bit word, composed of
The full-scale calibration is a 24-bit word, composed
three 8-bit registers, as shown in
. The offset
of three 8-bit registers, as shown in
. The
register is left-justified to align with the 32-bits of
full-scale calibration value is 24-bit, straight offset
conversion data. The offset is in twos complement
binary, normalized to 1.0 at code 400000h.
format with a maximum positive value of 7FFFFFh
summarizes the scaling of the full-scale register. A
and a maximum negative value of 800000h. This
register value of 400000h (default value) has no gain
value is subtracted from the conversion data. A
correction (gain = 1). Note that while the full-scale
register value of 00000h has no offset correction
calibration register value corrects gain errors above 1
(default value). Note that while the offset calibration
(gain correction < 1), the full-scale range of the
register value can correct offsets ranging from –FS to
analog inputs should not exceed 103% to avoid input
+FS (as shown in
), to avoid input overload,
overload.
the analog inputs cannot exceed the full-scale range.
Table 17. Full-Scale Calibration Register Values
Table 16. Offset Calibration Values
FSC REGISTER
GAIN CORRECTION
OFC REGISTER
FINAL OUTPUT CODE
800000h
2.0
7FFFFFh
80000000h
400000h
1.0
000001h
FFFFFF00h
200000h
0.5
000000h
00000000h
000000h
0
FFFFFFh
00000100h
800000h
7FFFFF00h
(1) Full 32-bit final output code with zero code input.
Table 18. Offset Calibration Word
REGISTER
BYTE
BIT ORDER
OFC0
LSB
B7
B6
B5
B4
B3
B2
B1
B0 (LSB)
OFC1
MID
B15
B14
B13
B12
B11
B10
B9
B8
OFC2
MSB
B23 (MSB)
B22
B21
B20
B19
B18
B17
B16
Table 19. Full-Scale Calibration Word
REGISTER
BYTE
BIT ORDER
FSC0
LSB
B7
B6
B5
B4
B3
B2
B1
B0 (LSB)
FSC1
MID
B15
B14
B13
B12
B11
B10
B9
B8
FSC2
MSB
B23 (MSB)
B22
B21
B20
B19
B18
B17
B16
Copyright © 2007–2015, Texas Instruments Incorporated
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