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ZSC31010CEG1-T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P43
ZSC31010 Datasheet
© 2016 Integrated Device Technology, Inc.
28
January 20, 2016
EEPROM Range Description Notes
29:15 Gain_B Bridge Gain:
Gain_B[14] => multiply x 8
Gain_B[13:0] => 14-bit unsigned number representing a number
in the range [0,8)
43:30 Offset_B Signed 14-bit offset for bridge correction
51:44 Gain_T Temperature gain coefficient used to correct PTAT reading.
59:52 Offset_T Temperature offset coefficient used to correct PTAT reading.
67:60 T
SETL
Raw PTAT reference value. (See Technical Note — ZSC31010,
ZSC31015, and ZSSC3015 Calibration Sequence, DLL, and EXE
for details.)
75:68 Tcg Coefficient for temperature correction of bridge gain term.
Tcg = 8-bit magnitude of Tcg term.
Sign is determined by Tc_cfg (bits 87:84).
83:76 Tco Coefficient for temperature correction of bridge offset term.
Tco = 8-bit magnitude of Tco term.
Sign and scaling are determined by Tc_cfg (bits 87:84).
87:84 Tc_cfg This 4-bit term determines options for temperature compensation of
the bridge:
Tc_cfg[3] => If set, bridge signal polarity flips.
Tc_cfg[2] => If set, Tcg is negative.
Tc_cfg[1] => Scale magnitude of Tco term by 8, and if SOT
applies to Tco, scale SOT by 8.
Tc_cfg[0] => If set, Tco is negative.
95:88 SOT 2
nd
Order Term. This term is a 7-bit magnitude with sign.
SOT[7] = 1 negative
SOT[7] = 0 positive
SOT[6:0] = magnitude [0-127]
This term can apply to a 2
nd
order Tcg, Tco or bridge correction*.
(See Tc_cfg above.)
* The SOT range for the bridge correction is limited for the negative value to 0xC0 by the MathLib.DLL. See Technical Note — ZSC31010,
ZSC31015, and ZSSC3015 Calibration Sequence, DLL, and EXE for details.
ZSC31010 Datasheet
© 2016 Integrated Device Technology, Inc.
29
January 20, 2016
EEPROM Range Description Notes
99:96 {SOT_cfg,
Pamp_Gain}
Bits [99:98] = SOT_cfg (For more details, see section 3.6.1.)
00 = SOT applies to Bridge
01 = SOT applies to Tcg
10 = SOT applies to Tco
11 = Prohibited
Bits [97:96] = PreAmp Gain
00 => 6
01 => 24 (default setting)
10 => 12
11 => 48
(Only the default gain setting (24) is tested at the factory;
all other gain settings are not guaranteed.)
3.6. Calibration Math
3.6.1. Correction Coefficients
All terms are calculated external to the IC and then programmed to the EEPROM through the serial interface.
Table 3.7 Correction Coefficients
Coefficient Description
Gain_B
Gain term used to compensate span of Bridge reading
Offset_B
Offset term used to compensate offset of Bridge reading
Gain_T
Gain term used to compensate span of Temp reading
Offset_T
Offset term used to compensate offset of Temp reading
SOT
Second Order Term. The SOT can be applied as a second order correction term for the following:
- Bridge measurement
- Temperature coefficient of offset (Tco)
- Temperature coefficient of gain (Tcg)
The EEPROM bits 99:98 determine what SOT applies to.
Note: There are limitations for the SOT for the bridge measurement and for the SOT for the Tco, which are
explained in section 3.6.2.7.
T
SETL
RAW PTAT reference value. (See Technical Note—ZSC31010, ZSC31015, and ZSSC3015 Calibration
Sequence, DLL, and EXE for details.)
Tcg
Temperature correction coefficient of bridge gain term (this term has an 8-bit magnitude and a sign bit
(Tc_cfg[2]).
Tco
Temperature correction coefficient of bridge offset term (this term has an 8-bit magnitude, a sign bit
(Tc_cfg[0]), and a scaling bit (Tc_cfg[1]), which can multiply its magnitude by 8).
ZSC31010 Datasheet
© 2016 Integrated Device Technology, Inc.
30
January 20, 2016
3.6.2. Interpretation of Binary Numbers for Correction Coefficients
BR_Raw should be interpreted as an unsigned number in the set [0, 16383] with a resolution of 1.
T_Raw should be interpreted as an unsigned number in the set [0, 16383], with a resolution of 4.
3.6.2.1. Gain_B Interpretation
Gain_B should be interpreted as a number in the set [0, 64]. The MSB (bit 14) is a scaling bit that will multiply the
effect of the remaining bits Gain_B[13:0] by 8. Bits Gain_B[13:0] represent a number in the range of [0, 8], with
Gain_B[13] having a weighting of 4, and each subsequent bit has a weighting of ½ the previous bit.
Table 3.8 Gain_B[13:0] Weightings
Bit Position Weighting
13 2
2
= 4
12 2
1
= 2
11 2
0
= 1
10 2
-1
... ...
3 2
-8
2 2
-9
1 2
-10
0 2
-11
Examples:
The binary number: 010010100110001
B
= 4.6489; Gain_B[14] is 0
B
, so the number represented by
Gain_B[13:0] is not multiplied by 8.
The binary number: 101100010010110
B
= 24.586; Gain_B[14] is 1
B
, so the number represented by
Gain_B[13:0] is multiplied by 8.
Limitation: Using the 5-point calibration 5pt-Tcg&Tco&SOT_Tco (including the second order SOT_Tco), the
Gain_B is limited to a value equal or less than 8 (instead of 64).
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P43

ZSC31010CEG1-T

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Sensor Interface Sensor Signal Conditoner
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