EVB90620 Datasheet, PDF (12/39 Pages) Melexis Microelectronic Systems – High precision non-contact temperature measurements

MLX90620
16x4 IR array
7.2 Read measurement data
7.2.1 PTAT data read
Absolute ambient temperature data of the device it self (package temperature) can be read by using following
command:
Slave address
Command
Start address
Address step
Number of reads
Slave address
SDA
S1 1 0 0 0 0 0 WA 0 0 0 0 0 0 1 0 A 1 0 0 1 0 0 0 0 A 0 0 0 0 0 0 0 0 A 0 0 0 0 0 0 0 1 A S1 1 0 0 0 0 0 R A
PTAT data
LSByte
A
SCL
Figure 9 PTAT (SA = 0x60, command = 0x02, Start address = 0x90,
Address step = 0x00, Number of reads = 0x01) measurement result read
PTAT data
MSByte
AP
PTAT _ data {PTAT _ data _ MSbyte: PTAT _ data _ LSbyte}
7.2.2 IR data read
There are four options available for reading IR data: (See section 8.2.1 for an overview of the RAM
addresses).
- Whole frame read (MELEXIS recommends the whole frame read for maximum refresh rate)
Slave address
Command
Start address
Address step
Number of reads
Slave address
SDA
S 1 1 0 0 0 0 0 W A 0 0 0 0 0 0 1 0 A 0 0 0 0 0 0 0 0 A 0 0 0 0 0 0 0 1 A 0 1 0 0 0 0 0 0 A S1 1 0 0 0 0 0 R A
SCL
IR pixel(0, 0)
LSByte
A
IR pixel(0, 0)
MSByte
A
IR pixel(1, 0)
LSByte
IR pixel(1, 0)
MSByte
A
IR pixel(3, 15)
LSByte
IR pixel(3, 15)
MSByte
A
A
AP
Figure 10 Whole frame (SA = 0x60, command = 0x02, Start address = 0x00,
Address step = 0x01, Number of reads = 0x40) measurement result read
- Single column read
Slave address
Command
SDA
S1 1 0 0 0 0 0 WA 0 0 0 0 0 0 1 0 A
SCL
Start address
Address step
Number of reads
Slave address
A 0 0 0 0 0 0 0 1 A 0 0 0 0 0 1 0 0 A S1 1 0 0 0 0 0 R A
IR pixel(0, column)
LSByte
A
IR pixel(0, column)
MSByte
A
IR pixel(1, column)
LSByte
IR pixel(1, column)
MSByte
A
IR pixel(3, column)
LSByte
IR pixel(3, column)
MSByte
A
A
AP
Figure 11 Single column (SA = 0x60, command = 0x02, Start address = 0x00…0x3C (step 0x04),
Address step = 0x01, Number of reads = 0x04) measurement result read
3001090620
Rev 4.0
Page 12 of 40
Datasheet IR16x4
19 September 2012