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參數(shù)資料
| 型號： | MLX90308CABLUD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 2/24頁 |
| 文件大小： | 724K |
| 代理商： | MLX90308CABLUD |
MLX90308CAB
Programmable Sensor Interface
MLX90308CAB Programmable Sensor Interface
Page 10
Rev 2.0 11/October/00
Analog Mode
The parameters OF and GN represent, respectively,
offset correction and span control, while OFTCi and
GNTCi
represent
their
temperature
coefficients
(thermal zero shift and thermal span shift). After
reset, the firmware continuously calculates the offset
and gain DAC settings as follows: The EEPROM
holds parameters GN, OF, OFTCi and GNTCi, where
“i” is the gap number and can be 1 < i < 4. The
transfer function is described below.
Vou t
=
DAC _ GAIN *CSGN*[(FG*V in)
+DAC_OFFSET+CSOF] where:
FG = Fixed Gain (~20V/V). Part of the hardware
design, and not changeable.
DAC_GAIN = GN[9:0] + [GNTCi * (Temp_f-Ti)]
where
Temp_f = Filtered temperature (previously
described).
Ti= Temperature segment point I = 1,2, or 3.
GNTCi = Gain TC for a given temperature
segment i, GNTCiL and GNTCiH in
EEPROM table.
CSGN = Course Gain, part of byte 2 in
EEPROM.
GN[9:0] = Fine Gain, bytes 3 and 17 in
EEPROM.
OFFSET
For the first temperature gap:
DAC_OFFSET = OF[9:0] + OFTCi *
(Ti – Temp_f).
For the second, third, and fourth temperature gaps:
DAC_OFFSET = OF + OFTCi * (Temp_f – Ti)
OF = Base Offset,
For the second temperature gap:
OF = OF[9:0]
For the third temperature gap:
OF = OF[9:0] + [OFTC2 * (T2-T1)]
For the fourth temperature gap:
OF = OF[9:0] + [OFTC2 * (T2-T1)]
+ [OFTC3 * (T3 – T2)]
CSOF = Coarse Offset, part of byte 2 in
EEPROM.
OF[9:0] = Fine offset (called fixed Offset in the
EEPROM table) Bytes 4 and 17 in
EEPROM
Digital Mode
The MLX90308 firmware provides the capability of
digitally processing the sensor signal in addition to
the analog processing. This capability allows for
signal correction.
Signal Correction
While in digital mode the firmware can perform signal
correction. This is an adjustment to the output level
on
the
input
signal
level.
Adjustment
coefficients can be set for five different signal ranges.
The output is obtained by the following formula:
Output = (Signal – Pi) * Pci + Poff where
Signal = input signal measurement;
Poff = Pressure ordinate
Pi = Pressure signal point (I = 2,3,4,5)
Pci = programmed coefficient.
The PCi coefficients are coded on 12 bits: one bit for
the sign, one for the unity, and the rest for the
decimals. The Pi are coded on 10 bits (0-3FFh) in
high-low order.
PNB_TNB: contains the number of signal points,
coded on the four MSB’s. The four LSB’s are
reserved for the number of temperature points. See
Table 4.
Compensation Trade-Offs
A compromise must be made between temperature
compensation
and
pressure
correction.
The
EEPROM space where the signal coefficients are
stored is shared with the temperature coefficients,
with the result that an EEPROM byte can be used
either for a temperature coefficient or for a signal
coefficient, but not both. Table 6 presents the
possibilities
among
the
maximum
number
of
temperature gaps and the maximum number of
signal gaps.
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