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MLX90615 데이터시트(PDF) 11 Page - Melexis Microelectronic Systems |
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11 / 31 page 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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