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MLX90640ESFBAA000TU Datenblatt(PDF) 7 Page - Melexis Microelectronic Systems

Teilenummer MLX90640ESFBAA000TU
Bauteilbeschribung  MLX90640 32x24 IR array
Download  12 Pages
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Hersteller  MELEXIS [Melexis Microelectronic Systems]
Direct Link  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

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MLX90640 32x24 IR array
Short form Datasheet
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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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