MLX90308CCC datasheet(15/26 Pages) MICRO-ELECTRONICS

Part #	MLX90308CCC

Description	Programmable Sensor Interface

Download	26 Pages

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Manufacturer	MICRO-ELECTRONICS [Micro Electronics]

Direct Link	http://www.microelectr.com.hk

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15 / 26 page

MLX902xx Name of Sensor

Rev Y.X

22/Aug/98

Page 15

MLX90308CCC

Programmable Sensor Interface

MLX90308CCC Programmable Sensor Interface

Page 15

Rev 2.2

23/Oct/01

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.

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:

11 to read a RAM byte.

10 to read an EEPROM byte.

01 to write in the EEPROM.

00 to write in the RAM.

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 MLX90308CCC. 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.

Clock Temperature Stabilization

To provide a stable clock frequency from the

internal clock over the entire operating temperature

range, three separate clock adjust values are used.

Shifts in operating frequency over temperature do

not effect the performance but do, however, cause

the communications baud rate to change.

The firmware monitors the internal temperature

sensor to determine which of three temperature

ranges the device currently is in. Each temperature

range has a factory set clock adjust value, ClkTC1,

ClkTC2, and ClkTC3. The temperature ranges are

also factory set. The Ctemp1 and Ctemp2 values

differentiate the three ranges. In order for the

temperature A to D value to be scaled consistently

with what was used during factory programming, the

CLKgntp (temperature amplifier gain) valued is

stored. The Cadj value stored in byte 1 of the

EEPROM is used to control the internal clock

frequency while the chip boots.

Unused Bytes

There are eight unused bytes in the EEPROM

address map. These bytes can be used by the user

to store information such as a serial number,

assembly date code, production line, etc. Melexis

doesn’t guarantee that these bytes will be available

to the user in future revisions of the firmware.

EEPROM Checksum

A checksum test is used to ensure the contents of

the EEPROM. The eight bit sum of all of the

EEPROM addresses should have a remainder of

0FFh when the checksum test is enabled (mode

byte). Byte 47 is used to make the sum remainder

totals 0FFh. If the checksum test fails, the output

will be driven to a user defined value, Faultval.

When the checksum test is enabled, the checksum

is verified at initialization of RAM after a reset.

RAM Data

All the coefficients (pressure, temperature) are

compacted in a manner similar to that used for the

EEPROM. They are stored on 12 bits (instead of

keeping 16 bits for each coefficient). All the

measurements are stored on 16 bits. The user must

have access to the RAM and the EEPROM, while

interrupt reading of the serial port. Therefore, bytes

must be kept available for the return address, the A-

accu and the B-accu, when an interrupt occurs. The

RAM keeps the same structure in the both modes.

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