Datasheet

u
Coefficient
Digit8
u
u u u u
S
x
Coefficient
Digit7
x.
x x x
Coefficient
Digit6
x
x x x
Coefficient
Digit5
x
x x x
Coefficient
Digit4
x
x x x
Coefficient
Digit3
x
x x x
Coefficient
Digit2
x
x x x
Coefficient
Digit1
Fraction
Digit5
Fraction
Digit4
Fraction
Digit3
Fraction
Digit2
Fraction
Digit1
Integer
Digit1
Sign
Bit
Fraction
Digit6
u=unusedordon’tcarebits
Digit=hexadecimaldigit
M0127-01
0
TAS5717
TAS5719
SLOS655A –NOVEMBER 2010– REVISED FEBRUARY 2011 www.ti.com
Gain coefficients, entered via the I
2
C bus, must be entered as 32-bit binary numbers. The format of the 32-bit
number (4-byte or 8-digit hexadecimal number) is shown in Figure 45
Figure 45. Alignment of 3.23 Coefficient in 32-Bit I
2
C Word
Table 1. Sample Calculation for 3.23 Format
db Linear Decimal Hex (3.23 Format)
0 1 8,388,608 80 0000
5 1.77 14,917,288 00E3 9EA8
–5 0.56 4,717,260 0047 FACC
X L = 10
(X/20)
D = 8388608 × L H = dec2hex (D, 8)
Table 2. Sample Calculation for 9.17 Format
db Linear Decimal Hex (9.17 Format)
0 1 131,072 20 000
5 1.77 231,997 38 A3D
–5 0.56 73,400 11 EB8
X L = 10
(X/20)
D = 131,072 × L H = dec2hex (D, 8)
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