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MLX90640ESFBAA000TU Datenblatt(PDF) 7 Page - Melexis Microelectronic Systems |
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MLX90640ESFBAA000TU Datenblatt(HTML) 7 Page - Melexis Microelectronic Systems |
7 / 12 page MLX90640 32x24 IR array Short form Datasheet Page 7 of 12 REVISION 3 – NOVEMBER 4, 2016 7.2. Communication protocol Low level Start / Stop conditions Each communication session is initiated by a START condition and ends with a STOP condition. A START condition is initiated by a HIGH to LOW transition of the SDA while a STOP is generated by a LOW to HIGH transition. Both changes must be done while the SCL is HIGH. Device addressing The master is addressing the slave device by sending a 7-bit slave address after the START condition. The first seven bits are dedicated for the address and the 8 th is Read/Write (R/W) bit. This bit indicates the direction of the transfer: • Read (HIGH) means that the master will read the data from the slave • Write (LOW) means that the master will send data to the slave Acknowledge During the 9 th clock following every byte transfer the transmitter releases the SDA line. The receiver acknowledges (ACK) receiving the byte by pulling SDA line to low or does not acknowledge (NoACK) by letting the SDA ‘HIGH’. I 2C command format Figure 2 I 2C write command format (default SA=0x33 is used) Figure 3 I 2C read command format (default SA=0x33 is used) 7.3. Device modes The device can operate in following modes: • Normal mode • Step mode Normal mode In this mode the measurements are constantly running. Depending on the selected frame rate Fps in the control register, the data for IR pixels and Ta will be updated in the RAM each 1/Fps seconds. In this mode the external microcontroller has full access to the internal registers and memories of the device. SCL SDA 1 0 1 0 A A S A A A P Slave address W 1 1 0 MSByte address LSByte address MSByte data LSByte data I 2 C write SCL SDA 1 0 1 0 A A S A A NAK P Slave address W 1 1 0 MSByte address LSByte address MSByte data LSByte data I 2 C read S 1 0 1 0 W 1 1 0 A Slave address |
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