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PDF MLX90323 Data sheet ( Hoja de datos )
| Número de pieza | MLX90323 | |
| Descripción | 4 - 20 mA Loop Sensor Interface | |
| Fabricantes | Melexis | |
| Logotipo |  |
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MLX90323
4 – 20 mA Loop Sensor Interface
with Signal Conditioning and EEPROM
Features and Benefits
Programmable Sensor Interface IC with 4 to
20 mA current loop output
Power supply from 6 to 35VDC
External or internal temperature sensor for
compensating temperature errors
Application Examples
Industrial pressure transducers.
Strain gauges, accelerometers, position
sensors, etc.
Any bridge type sensor with current loop
output.
Ordering code
Product Code Temperature Code
MLX90323
K
MLX90323
K
Package Code
DF
DF
Option Code
AAA-000
AAA-000
Legend:
Temperature Code:
Package Code:
Packing Form:
K for Temperature Range -40°C to +125°C
DF for SOIC300Mil
RE for Reel, TU for Tube
Ordering example: MLX90323KDF-AAA-000-TU
Packing Form Code
TU
RE
1 Functional Diagram
2 General Description
VDD
FET VDD1
OFC
Supply Regulator
FLT
The IC converts small changes of output voltage
of full Wheatstone resistive bridge (caused by
mechanical stimulus such as pressure, force,
torque, light or magnetic field) to large changes of
the IC output current.
VBP
VBN
TMP
GND
3.5V
DAC_Offset
OPA
0V
x 35
x2
INV
Hardware Gain = 70
Coarse Offset
1.24kOhm
2-bit
CSGN
GAIN
0.97V/V
0.48V/V
Fine Gain DAC
External
Temp Sensor
Internal
Temp Sensor
Temp Amp Gain
GNTP [1:0]
3.5V
ADC
0V
Micro-
Processor
It removes parasitic DC level (Offset) from the
output bridge voltage and amplifies this signal
certain times (Gain). Offset and Gain are
temperature dependant, so the IC allows
temperature compensation of bridge parasitic DC
GAIN CMO
CMN shift and sensitivity. Temperature can be
measured either by internal or external (resistor)
IO1
IO2
temperature sensor. The values of Offset and
COMS Gain and their temperature dependency are
gotten during the calibration process and are
stored in the EEPROM..
TSTB
The IC has industry standard 4 – 20 mA current
loop output interface and takes power directly from
2-wire signal line. The MLX90323 works properly
over wide voltage range (from 6 to 35 V) at the
signal line.
3901090323
Rev 003
Page 1 of 25
Data Sheet
Feb/12
1 page  
MLX90323
4 – 20 mA Loop Sensor Interface
with Signal Conditioning and EEPROM
5 Pin Definitions and Descriptions
Table 2. Pin Description
Pin Signal Name Description
1,2 NC
3 TSTB
4 FLT
5 OFC
6,7 VBN,VBP
8 TMP
9 VDD
10 FET
11 VDD1
12 NC
13 CMO
14 CMN
15 GND
16 COMS
Do not connect
Test pin for Melexis production testing. (in normal application connected to
VDD)
Filter pin; allows for connection of a capacitor to the internal analog path.
Offset control output. Provides access to the internal programmed offset
control voltage for use with external circuitry. (unconnected when not used)
Bridge inputs, negative and positive.
Temperature sensor input. An external temperature sensor can be used in
conjunction with the internal one. The external sensor can provide a
temperature reading at the location of the bridge sensor.
Regulated supply voltage. Used for internal analog circuitry to ensure
accurate and stable signal manipulation.
Regulator FET gate control. For generating a stable supply for the bridge
sensor and internal analog circuitry (generates regulated voltage for VDD).
Unregulated supply voltage. Used for digital circuitry and to generate FET
output.
Do not connect
Current output.
Current negative rail. Current return path.
Power supply return.
Serial communications pin. Bi-directional serial communication signal for
reading and writing to the EEPROM.
1 NC
2 NC
3 TSTB
4 FLT
5 OFC
6 VBN
7 VBP
8 TMP
COMS
GND
CMN
CMO
NC
VDD1
FET
VDD
16
15
14
13
12
11
10
9
3901090323
Rev 003
Page 5 of 25
Data Sheet
Feb/12
5 Page 
MLX90323
4 – 20 mA Loop Sensor Interface
with Signal Conditioning and EEPROM
7.5 Communications
The MLX90323 firmware transfers a complete byte of data into and from the memory based on a simple
command structure. The commands allow data to be read and written to and from the EEPROM and read
from the RAM. RAM data that can be read includes the current digitized temperature. The commands are
described below. Melexis provides setup software for programming the MLX90323.
UART Commands
The commands can be divided into three parts: (1) downloading of data from the ASIC, (2) uploading of data
to the ASIC and (3) the reset command. UART configuration: start bit, 8 data bits, stop bit.
All the commands have the same identification bits. The two MSB’s of the sent byte indicate the command
while the last six MSB’s designate the desired address. The commands are coded as followed:
Command
Read RAM
Write RAM
Read EEPROM
Write EEPROM
Reset
Start
Stop
bit Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Bit
0 1 1 AD5 AD4 AD3 AD2 AD1 AD0
1
0 0 0 AD5 AD4 AD3 AD2 AD1 AD0
1
0 1 0 AD5 AD4 AD3 AD2 AD1 AD0
1
0 0 1 AD5 AD4 AD3 AD2 AD1 AD0
1
010 1 1 1 1 1 1
1
The addresses can include 0-63 for the RAM, 0-47 for the EEPROM, and 63 for the EEPROM, RESET
Command (read).
Downloading Command
With one byte, data can be downloaded from the ASIC. The ASIC will automatically send the value of the
desired byte.
Uploading Command
Writing to the RAM or EEPROM involves a simple handshaking protocol in which each byte transmitted is
acknowledged by the firmware. The first byte transmitted to the firmware includes both command and
address. The firmware acknowledges receipt of the command and address byte by echoing the same
information back to the transmitter. This “echo” also indicates that the firmware is ready to receive the byte of
data to be stored in RAM or EEPROM. Next, the byte of value to be stored is transmitted and, if successfully
received and stored by the firmware, is acknowledged by a “data received signal,” which is two bytes of value
BCh. If the “data received signal” is not observed, it may be assumed that no value has been stored in RAM
or EEPROM.
Reset Command
Reading the address 63 of the EEPROM resets the ASIC and generates a received receipt indication.
Immediately before reset, the ASIC sends a value of BCh to the UART, indicating that the reset has been
received.
EEPROM Data
All user-settable variables are stored in the EEPROM within the MLX90323. The EEPROM is always re-
programmable. Changes to data in the EEPROM do not take effect until the device is reset via a soft reset or
power cycle. 12 bit variables are stored on 1.5 bytes. The 4 MSB’s are stored in a separate byte and shared
with the four MSB’s of another 12-bit variable.
3901090323
Rev 003
Page 11 of 25
Data Sheet
Feb/12
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MLX90323.PDF ] | |
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