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PDF MLX90308 Data sheet ( Hoja de datos )
| Número de pieza | MLX90308 | |
| Descripción | Programmable Sensor Interface | |
| Fabricantes | Melexis Microelectronic | |
| Logotipo |  |
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MLX90308
Programmable Sensor Interface
Features and Benefits
s Microprocessor-controlled signal conditioning for bridge-type sensors
s Suited for low-cost sensors: reduction of non-linearity by programmable coefficients
s External or internal temperature sensor for compensating temperature errors
s Versatile output signal ranges: 4, 5, 10, or 11VDC; 4 to 20 mA loop
s Mass calibration easy with 2400 or 9600 baud UART
s Power supply from 6 to 35VDC
Applications
s Pressure transducers
s Accelerometers
s Temperature sensor assemblies
Linear position sensors
Ordering Information
Part No.
MLX90308
MLX90308
Temperature Suffix
L (-40C to +150C)
L (-40C to +150C)
Package code
DF (SOIC16w)
UF (die on foil)
Description
The MLX90308 is a dedicated microcontroller which performs signal conditioning for sensors wired in bridge or
differential configurations. Sensors that can be used include thermistors, strain gauges, load cells, pressure
sensors, accelerometers, etc. The signal conditioning includes gain adjustment, offset control, high order
temperature and linearity compensation. Compensation values are stored in EEPROM and are re-
programmable. Programming is accomplished by using a PC, with an interface circuit (level shifting and glue
logic), and provided software.
The application circuits can provide an output of an absolute voltage, relative voltage, or current. The output can
be range limited with defined outputs when
the signal is beyond the programmed limits.
Other features include alarm outputs and
level steering. The robust electrical design
allows the MLX90308 to be used where
most signal conditioning and sensor
interface circuits cannot be used. Voltage
regulation control is provided for absolute
voltage and current modes (external FET
required).
The standard package is a plastic SO16W.
The device is static-sensitive and requires
ESD precautions.
M39L0X190092x0x3N08ame of Sensor Rev Y.X 22/Aug/98
Rev 006
Page 1Page 1
www.DataSheet4U.com
Apr/04
1 page  
MLX90308
Programmable Sensor Interface
Table 1. MLX90308 Electrical Specifications (continued)
DC operating parameters: TA = -40 to 140oC, VDD1 = 6 to 35VDC (unless otherwise specified).
Parameter
Test Conditions
Min Typ Max
Units
Bandwidth (-3dB)
39 nF connected from FLT to GND
Noise, VDD = 5V, CFLT=39nF, CL=10nF, RL =5KΩ, Analog Mode
Temperature Sensor & - Amplifier
Temperature sensor sensitivity
Temperature sensor output voltage
Temperature Sensor & Amplifier (continued).
Input voltage range TMP pin
GNTP[1,0] = 00
@ VDD = 5.0V
GNTP[1,0] = 01
GNTP[1,0] = 10
GNTP[1,0] = 11
DAC
Resolution
Monotonicity
Ratiometric output range (DAC output)
Offset Error
Differential non-linearly
Integral non-linearity
ADC
Resolution
Monotonicity
Ratiometric input range
Offset error
Differential non-linearly
Integral non-linearity
On-Chip RC Oscillator and Clock
Untrimmed RC oscillator
frequency
Trimmed RC oscillator frequency
www.DataShe(Mete4aUs.ucroemd at TMP pin with TSTB pin pulled low after power up)
Frequency temperature coefficiency
Clock Stability with temperature compensation over full temperature range
Ratio of f (microcontroller main clock
and (RC oscillator)
TURBO = 0
TURBO = 1
2.8 3.5 4.2
7.1
390
70 380
207 517
145 367
101 263
71 186
10
Guaranteed By Design
1 75
10
1
2
10
Guaranteed by design
1 75
10
1
2
40 250
86.9 87.8 88.7
26
-3 +3
7
28
KHz
mVRMS
uV/ºC
mV
mV
mV
mV
mV
Bit
% VDD
LSB
LSB
LSB
Bit
% VDD
LSB
LSB
LSB
kHz
kHz
Hz/ºC
%
M39L0X190092x0x3N08ame of Sensor Rev Y.X 22/Aug/98
Rev 006
Page 5Page 5
Apr/04
5 Page 
MLX90308
Programmable Sensor Interface
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
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).
www.DataShIefeGt4NUT.Cco1m> 2047 => DAC_GAIN ↑
If GNTC2,3,4 > 2047 => DAC_GAIN ↓
[V/V]
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.
(7 − −6) * OF[9 : 0] − 6 = DAC _ OFFSET [mV/V]
1023
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.
(0.97 − 0.48) * GN[9 : 0] + 0.48 = DAC _ GAIN
1023
M39L0X190092x0x3N08ame of Sensor Rev Y.X 22/Aug/98
Rev 006
Page 1P1age 11
Apr/04
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet MLX90308.PDF ] | |
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