MLX90308(2004) Просмотр технического описания (PDF) - Melexis Microelectronic Systems
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MLX90308 Datasheet PDF : 28 Pages
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MLX90308
Programmable Sensor Interface
Unique Features
Customization
Melexis can customize the MLX90308 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 MLX90308 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 90308
can replace.
ESD Precautions
Observe standard ESD control procedures for CMOS
semiconductors.
M39L0X190092x0x3N08ame of Sensor Rev Y.X 22/Aug/98
Rev 006
Page 7Page 7
Apr/04
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