參數(shù)資料
型號(hào)： EVB90308
廠商： Melexis Technologies NV
文件頁(yè)數(shù)： 3/28頁(yè)
文件大?。?/td> 0K
描述： DEMO KIT MLX90308 SENS INTERFACE
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，傳感器至模數(shù)轉(zhuǎn)換器接口，可編程
嵌入式： 是，MCU，8 位
已用 IC / 零件： MLX90308
主要屬性： 用于橋型傳感器的 MCU 控制信號(hào)調(diào)節(jié)
次要屬性： GUI 輸出類型：絕對(duì)電壓，比率制電壓，電流輸出模式
已供物品： 板，文檔，樣品，軟件
產(chǎn)品目錄頁(yè)面： 1460 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： MLX90308LDF-DAA-000-TU-ND - IC SENSOR PROG INTERFACE 16-SOIC
其它名稱： DK90308
DK90308-ND
MLX90308
Programmable Sensor Interface
3901090308
Rev 007
Page 11
May/12
Different Modes
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
OFFSET
DAC_OFFSET (new value) ~ OF[9:0]+[OFTCi* dT]
OF[9:0] = Fixed Gain, bytes 4 and 17 in EEPROM.
OFTCi = Offset for a given temperature
segment I. OFTCiL and OFTCiH in
EEPROM table.
dT = Temp. change within the appropriate gap.
Calculation of the offset for a given temperature seg-
ment is performed the same way as for the gain.
function is described below.
Vout
=
FG
*
DAC_GAIN
*
CSGN[2:0]
*
{Vin+DAC_OFFSET+CSOF}
Iout = FG * DAC_GAIN * CSGN[1:0] *
{Vin+DAC_OFFSET+CSOF} * 8.85mA/V
FG = Hardware Gain (~20V/V). Part of the hardware
design, and not changeable.
CSGN = Course Gain, part of byte 2 in EEPROM.
CSOF = Coarse Offset, part of byte 2 in EEPROM.
GAIN
DAC_GAIN (new value) ~ GN[9:0] + [GNTCi * dT]
GN[9:0] = Fixed Gain, bytes 3 and 17 in EEPROM.
GNTCi = Gain TC for a given temperature
segment I. GNTCiL and GNTCiH in
EEPROM table.
dT = Temp. change within the appropriate gap.
How to calculate gain in the first temp. gap?:
DAC_GAIN = GN[9:0] - GNTC1 * (T1 – Temp_f1)
How to calculate gain in the other temp. gaps?:
2nd gap: DAC_GAIN = GN[9:0] + GNTC2 *
(Temp_f2 – T1)
3th gap: DAC_GAIN = DAC_GAIN2 + GNTC3 *
(Temp_f3 – T2)
4th gap: DAC_GAIN = DAC_GAIN3 + GNTC4 *
(Temp_f4 – T3)
Where:
Temp_f = Filtered temp. (previously described).
If GNTC1 > 2047 => DAC_GAIN
If GNTC2,3,4 > 2047 => DAC_GAIN
[V/V]
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
based
on
the
input
signal
level.
Adjustment
coefficients can be set for five different signal ranges.
The output is obtained by the following formula:
1st gap: Output = (Signal ) * PC1 + Poff
Where:
Signal = input signal measurement;
Poff = Pressure ordinate = P1
PC1 = programmed coefficient first gap.
Following gaps:
Gap i: Output = (Signal – Pi) * PCi + Poff_i
Where
Signal = input signal measurement;
Poff_i = Pressure ordinate (i = 2,3,4,5)
Pi = Pressure signal point (i = 2,3,4,5)
PCi = programmed coefficient first gap (i = 2,3,4,5).
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 and
Table 5.
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