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PDF MLX90314 Data sheet ( Hoja de datos )
| Número de pieza | MLX90314 | |
| Descripción | Programmable IR Sensor Interface | |
| Fabricantes | Melexis Microelectronic | |
| Logotipo |  |
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MLX90314
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
s Linear position sensors
Ordering Information
Part No.
MLX90314
MLX90314
Temperature Suffix
L ( -40C to 150C )
L ( -40C to 150C )
Package
DF (SOIC16w)
UF (die on foil)
Description
The MLX90314 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 MLX90314 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.
M39L0X19092x0x3N14ame of Sensor Rev Y.X 22/Aug/98
Rev 007
Page 1 Page 1
www.DataSheet4U.com
Nov/04
1 page  
MLX90314
Programmable Sensor Interface
Table 1. MLX90314 Electrical Specifications (continued)
DC operating parameters: TA = -40 to 140oC, VDD1 = 6 to 35VDC (unless otherwise specified).
Parameter
Bandwidth (-3dB)
Test Conditions
39 nF connected from FLT to GND
Noise, VDD = 5V, CFLT=39nF, CL=10nF, RL =5KΩ, Analog Mode (Max. gain)
Min
2.8
Typ
3.5
Max
4.2
17
Units
KHz
mVRMS
Temperature Sensor & - Amplifier
Temperature sensor sensitivity
Temperature sensor output voltage
390 uV/ºC
70 380 mV
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
207 517 mV
145 367 mV
101 263 mV
71 186 mV
DAC
Resolution
Monotonicity
10
Guaranteed By Design
Bit
Ratiometric output range (DAC output)
Offset Error
1 75 % VDD
10 LSB
Differential non-linearly
Integral non-linearity
1 LSB
2 LSB
ADC
Resolution
Monotonicity
10
Guaranteed by design
Bit
Ratiometric input range
Offset error
Differential non-linearly
1 75 % VDD
10 LSB
1 LSB
Integral non-linearity
2 LSB
On-Chip RC Oscillator and Clock
Untrimmed RC oscillator
frequency
Trimmed RC oscillator frequency
(Measured at TMP pin with TSTB pin pulled low after power up)
Frequency temperature coefficiency
40 250 kHz
86.9 87.8 88.7 kHz
26 Hz/ºC
Clock Stability with temperature compensation over full temperature range
-3
+3 %
Ratio of f (microcontroller main clock
and (RC oscillator)
TURBO = 0
TURBO = 1
7
28
M39L0X19092x0x3N14ame of Sensor Rev Y.X 22/Aug/98
Rev 007
Page 5 Page 5
www.DataSheet4U.com
Nov/04
5 Page 
MLX90314
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 (~72V/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?:
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.
(1.83−
−1.57) *
OF[9
:
0]
−1.57
=
DAC
_
[mV/V]
OFFSET
1023
Digital Mode
The MLX90314 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:
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.
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]
(0.97 − 0.48) * GN[9 : 0] + 0.48 = DAC _ GAIN
1023
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.
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.
M39L0X19092x0x3N14ame of Sensor Rev Y.X 22/Aug/98
Rev 007
Page 11Page 11
Nov/04
www.DataSheet4U.com
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet MLX90314.PDF ] | |
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