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부품번호 | MLX90314 기능 |
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기능 | Programmable IR Sensor Interface | ||
제조업체 | Melexis Microelectronic | ||
로고 | |||
전체 28 페이지수
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
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
Coarse gain
Test Conditions
CSGN = 110*
CSGN = 111*
Fixed gain control range
Digital Mode & Current Mode Coarse Gain Stage
Course Gain
CSGN = 00
CSGN = 01
CSGN = 10
CSGN = 11
Voltage Mode Output Stage ( See Voltage Mode)
Output voltage span
CSGN[2:2] = 0
Min
20.4
33.1
0.480
Typ
Max
23.0
36.6
0.970
Units
V/V
V/V
V/V
1.05 1.17 V/V
1.71 1.89 V/V
2.77 3.06 V/V
4.48 4.95 V/V
4.5 6.5 V
Minimum output voltage
Output source current
Output sink current
Output resistance
Digital mode output span
Digital mode step size
Capacitive load VMO pin
Current Mode Output Stage
Fixed gain
Output current CMO pin
Current sense resistor
Digital mode current output span
Digital mode current step Size
Signal Path ( General)
Overall gain
Overall non-linearity
Ratiometry Error (4.75V – 5.25V)
3901090314
Rev 007
Gain
CSGN[2:2] = 1
Gain
@ 0V output voltage
Over complete output range
CSGN[2:2] = 0
CSGN[2:2] = 1
VDD = 5V, CSGN[2:2]=0
VDD = 5V, CSGN[2:2]=1
RSENSE = 24 ohm
Current mode
VDD = 5V
VDD = 5V,RSENSE=24Ω
Voltage mode
Current mode = 24Ω
Overall Gain < 250V/V
Overall Gain > 250V/V
Page 4
2.74 3.04 V/V
6.5 11 V
7.24 7.86 V/V
-0.2 V
2.0 mA
20 uA
25 Ohms
6.5 V
11.0 V
6.5 mV
11.0 mV
10 nF
8.4
27
24
23
30
9.3 mA/V
mA
Ohms
mA
uA
98 2100 V/V
284 2625 mA/V
-0.25 0.25 %
-1.75 1.75 %
-4.6 +4.6 %
Nov/04
www.DataSheet4U.com
4페이지 MLX90314
Programmable Sensor Interface
Unique Features
Customization
Melexis can customize the MLX90314 in both
hardware and firmware for unique requirements. The
hardware design provides 64 bytes of RAM, 3 kbytes
of ROM, and 48 bytes of EEPROM for use by the
firmware.
Special Information
The output of the sensor bridge is amplified via offset
and gain amplifiers and then converted to the correct
output signal form in one of the output stages.
The sensitivity and offset of the analog signal chain
are defined by numbers passed to the DAC interfaces
from the microcontroller core (GN[9:0] and OF[9:0]).
The wide range of bridge offset and gain is
accommodated by means of a 2-bit coarse adjustment
DAC in the offset adjustment (CSOF[1:0]), and a
similar one in the gain adjustment (CSGN[2:0]). The
signal path can be directed through the processor for
digital processing. Two I/O pins are available for
analog inputs or digital outputs. These pins can be
used for alarms on various points on the analog signal
path and built-in or external temperature values.
Programming and Setup
The MLX90314 needs to have the compensation
coefficients programmed for a particular bridge
sensor to create the sensor system.
Programming the EEPROM involves some
minimal communications interface circuitry,
Melexis’ setup software, and a PC. The
communications interface circuitry is available in
a development board. This circuitry
communicates with the PC via a standard RS-
232 serial communications port.
Table 2. Absolute Maximum Ratings
Supply voltage (ratiometric) VDD Max
6V
Supply voltage (ratiometric) VDD Min
Supply voltage (operating), VDD1 Max
Reverse voltage protection
4.5V
35V
-0.7V
Supply current, Current Mode, IDD
Supply current, Voltage Mode, IDD
Output current, IVMO
Output current (short to VDD), ISCVMO
Output current (short to VSS), ISCVMO
Output voltage, VVMO
Power dissipation, PD
Operating temperature range, TA
Storage temperature range, TS
Maximum junction temperature, TJ
3.5mA
4.5mA
8mA
100mA
8mA
+11V
71mW
-40 to +140°
-55 to +150°
150°C
Cross Reference
There are no known devices which the MLX 90314
can replace.
ESD Precautions
Observe standard ESD control procedures for CMOS
www.DataShseeemt4iUco.cnodmuctors.
M39L0X19092x0x3N14ame of Sensor Rev Y.X 22/Aug/98
Rev 007
Page 7 Page 7
Nov/04
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부품번호 | 상세설명 및 기능 | 제조사 |
MLX90313 | Programmable IR Sensor Interface | Melexis Microelectronic |
MLX90314 | Programmable IR Sensor Interface | Melexis Microelectronic |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |