MLX90621

16x4 IR array

Datasheet

39001090621

Page 11 of 44

Datasheet IR16x4

Rev 3.0

15 September 2016

Figure 6 Write configuration register (SA = 0x60, command = 0x03)

NOTE: The user must ensure that the bit 10 (POR or Brown-out flag) in Configuration register is set to “1” by the

MD. Furthermore, this bit must be checked regularly and if it is cleared it indicates that the device has been reset

and the initialisation procedure must be redone.

Example: If the value that has to be uploaded is 0x463E the following sequence must be sent:

1.

Start condition (Falling edge of SDA while SCL is high)

2.

Slave address (SA=0x60) plus write bit = 0xC0

3.

Command = 0x03

4.

LSByte check = LSByte – 0x55 = 0x3E – 0x55 = 0xE9

5.

LSbyte = 0x3E

6.

MSByte check = MSByte – 0x55 = 0x46 – 0x55 = 0xF1

7.

MSbyte = 0x46

8.

Stop condition (Rising edge of SDA while SCL is high)

The default configuration is:

-

IR and Ta refresh rate = 1Hz;

-

Normal mode (no sleep);

-

I

-

ADC low reference enabled;

Reading configuration

7.1.1.

Reading configuration register (EEPROM data)

7.1.1.1

Figure 7 Reading configuration register (SA = 0x60, command = 0x02,

Start address = 0x92, Address step = 0x00, Number of reads = 0x01)

Reading oscillator trimming register (EEPROM data)

7.1.1.2

Figure 8 Reading configuration register (SA = 0x60, command = 0x02,

Start address = 0x93, Address step = 0x00, Number of reads = 0x01)

SCL

SDA

1

0

1

0

0

0

0

A

0

0

0 0

0 1

1 A

S

A

A

LSByte check

(LSByte - 0x55)

LSByte data

A

0

MSByte check

(MSByte - 0x55)

MSByte data

(15:11)

A

P

(9:8)

1

Slave address

Command

W

SCL

SDA

1

0

1

0

0

0

0

A

0

0

0 0

0 1

0 A

S

A

A

0

P

Slave address

Command

0

0

1 0

0 1

0

Start address

1

Address step

0

0

0 0

0 0

0

0

A

A

Number of reads

0

0

0 0

0 0

1

0

S

Configuration value

LSByte

1

0

1

0

0

0

A

0

Slave address

Configuration value

MSByte

A

W

R

SCL

SDA

1

0

1

0

0

0

0

A

0

0

0 0

0 1

0 A

S

A

A

0

P

Slave address

Command

0

0

1 0

0 1

1

Start address

1

Address step

0

0

0 0

0 0

0

0

A

A

Number of reads

0

0

0 0

0 0

1

0

S

Oscillator trim value

LSByte

1

0

1

0

0

0

A

0

Slave address

Oscillator trim value

MSByte

A

W

R