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MLX90615SSG-DAA-000-TU Arkusz danych(PDF) 11 Page - Melexis Microelectronic Systems

Numer części MLX90615SSG-DAA-000-TU
Szczegółowy opis  Infra Red Thermometer
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Producent  MELEXIS [Melexis Microelectronic Systems]
Strona internetowa  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

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MLX90615
Infra Red Thermometer
3901090615
Page 11 of 32
Data Sheet
Rev 005
08 November 2013
8.4 SMBus compatible 2-wire protocol
The chip supports a 2 wires serial protocol, build with pins SDA and SCL.
SCL – digital input, used as the clock for SMBus compatible communication. A low pulse on that pin
with duration tREQ switches to the SMBus mode in case the PWM is selected in EEPROM. In case
PWM operation is desired, the SCL pin should be kept high. SMBus is the factory default (via
EEPROM settings).
SDA / PWM – Digital input / NMOS open drain output, used for PWM and input / output for the
SMBus. (SMBus is factory default function).
8.4.1 Functional description
The SMBus interface is a 2-wire protocol, allowing communication between the Master Device (MD)
and one or more Slave Devices (SD). In the system only one master can be present at any given time [1].
The MLX90615 can only be used as a slave device.
Generally, the MD initiates the start of data transfer by selecting a SD through the Slave Address
(SA).
The MD has read access to the RAM and EEPROM and write access to 14 EEPROM cells (at
addresses 0x00…0x0D). If the access to the MLX90615 is a read operation, it will respond with 16 data bits
and 8 bit PEC only if its own SA, programmed in the internal EEPROM, is equal to the SA, sent by the
master. The SA feature allows connecting up to 127 devices with 2 wires, unless the system has some of the
specific features described in paragraph 5.2 of reference [1]. In order to provide access to any device or to
assign an address to a SD before it is connected to the bus system, the communication must start with zero
SA followed by low R/W
¯ bit. When this command is sent from the MD, the MLX90615 will always respond
and will ignore the internal chip code information.
Note that EEPROM addresses 0x04…0x0D contain the factory calibration parameters and
should not be altered.
Special care must be taken not to put two MLX90615 devices with the same SD addresses on
the same bus as MLX90615 does not support ARP[1].
The MD can force the MLX90615 into low consumption mode “sleep mode”.
8.4.2 Differences with the standard SMBus specification (reference [1])
There are eleven command protocols for the standard SMBus interface. The MLX90615 supports only two of
them. Not supported commands are:
Quick Command
Byte commands - Sent Byte, Receive Byte, Write Byte and Read Byte
Process Call
Block commands – Block Write and Write-Block Read Process Call
Supported commands are:
Read Word
Write Word
8.4.3 Detailed description
The SDA pin of the MLX90615 can operate also as a PWM output, depending on the EEPROM
settings. If PWM is enabled, after POR the SDA pin is directly configured as a PWM output. The PWM mode
can be avoided and the pin can be restored to its Serial Data function by issuing SMBus request condition. If
SMBus mode is set, after POR, the request does not have to be sent.


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