MLX90614 Datasheet, PDF (12/40 Pages) List of Unclassifed Manufacturers – Single and Dual Zone

MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
The address PWMCTRL consists of control bits for configuring the PWM/SDA pin:
Bit 0
Select the type of 1 - Single PWM, factory default for 0 – Extended PWM, factory default
PWM mode:
MLX90614xAx
for MLX90614xBx
Bit 1
Enable/disable
1 - Enable PWM, disable SMBus
0 - Disable PWM (Enable SMBus),
the PWM:
Factory default
Bit 2
Configuration of 1 - Push-Pull,
0 – OpenDrain NMOS, factory default
the pin PWM:
Bit 3
Mode selection 1 - ThermoRelay,
0 - PWM, Factory default
Bits[8:4] Extemded PWM Number of repetitions divided by 2 of sensor 1 and 2 in Extended PWM
definition
mode. The number of repetitions can vary from 0 to 64 times.
Bits[15:9] PWM clock
2MHz divided by the number written in this place. (128 in case the number is
configuration
0.) A single PWM period consists of 2048 clocks and extended PWM of 4096
clocks for each period (2T in figure 6). The 2 MHz clock is valid for the
nominal HFO frequency.
The address ConfigRegister1 consists of control bits for configuring the analog and digital parts:
Bits[2:0]
– Configure coefficients of IIR
digital filter:
Bit 2
0
1
Bit 1
x
1
Bit 0
x
1
a₁
0.5
0.571428571
b₁
0.5
0.428571428
1
1
0
0.666(6)
0.333(3)
1
0
1
0.8
0.2
1
0
0
1
0 (IIR bypassed)
Bit 3
– Configure the type of
1 - PTC,
0 – PTAT.
ambient temperature sensor:
Bits[5:4] – Configure the type of data
Bit 5
Bit 4
Data 1
Data 2
transmitted through PWM:
0
0
Ta
IR 1
0
1
Ta
IR 2
1
1
IR 1
IR 2
1
0
IR 2
Undefined*
Bit 6
– Define the number of IR
1 – 2 sensors,
0 -1 sensor.
sensors:
Bit 7
– Define the sign Ks
Factory calibration, do not alter
(Ks=dAlpha/dTobj) :
Bits[10:8] – Configure coefficient N of
Bit 10 Bit 9 Bit 8
N
FIR digital filter:
0
0
0
8**
0
0
1
16**
0
1
0
32**
0
1
1
64**
1
0
0
128
1
0
1
256
1
1
0
512
1
1
1
1024
Bits[13:11] – Configure the gain of
Bit 13 Bit 12 Bit 11
Gain
amplifier:
0
0
0
0
0
1
1 (preamplifier bypassed)
3
0
1
0
6
0
1
1
12.5
1
0
0
25
1
0
1
50
1
1
0
100
1
1
1
100
Bit 14
Unused
Bit 15
– Define the sign of thermo- 1 - negative,
0 – positive.
shock compensation:
Note: The following bits/registers should not be altered (except with special tools – contact Melexis for such
tools availability) in order to keep the factory calibration relevant:
Ke [15..0] ; Config Register1 [13..11;7;3] ; addresses 00Fh and 019h.
* not recommended for extended PWM mode
** note recommended values
3901090614
Rev 003
Page 12 of 40
Data Sheet
03/Oct/2007