MLX90614ESF-AAB ETC2 [List of Unclassifed Manufacturers], MLX90614ESF-AAB Datasheet - Page 19

• Manufacturer Part Number: MLX90614ESF-AAB
• Description: Single and Dual Zone
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

The different time intervals t
t
t
t
Therefore a PWM pulse train with a duty cycle of 0.875 will indicate a fatal error in EEPROM (for single PWM
format).
Example:
T
To
To
Captured PWM high duration is 0.495*T => t
measured object temperature = 2X0.370* (50°C -0°C)+0°C = +37.0°C.
8.5.2 Extended PWM format
The PWM format for extended PWM is shown in Figure 11. Note that with bits DUAL[5:1]>00h each period
will be outputted 2N+1 times, where N is the decimal value of the number written in DUAL[5:1] (DUAL[5:1]
=PWM control & clock [8:4] ), like shown on Figure 12.
The temperature transmitted in Data 1 field can be calculated using the following equation:
For Data 2 field the equation is:
Where Tmin
Time bands are: t
period is twice the period for the single PWM format. All equations provided herein are given for the single
PWM period T. The EEPROM Error band signaling will be 43.75% duty cycle for Data1 and 93.75% for
Data2.
Note: EEPROM error signaling is implemented in automotive grade parts only.
Example:
Configuration: Ta : T
Ta
Ta
To
To
Captured high durations are 0.13068*(2T) and 0.7475*(2T), where 2T is each captured PWM period. Time band t
provided for reliable determination between Data1 and Data2 data fields. Thus Data1 is represented by 0.13068*(2T) and
Data2 – by 0.7475*(2T), and the temperatures can be calculated as follows:
t
t
3901090614
Rev 003
1
2
3
2
5
obj1
/T=(t
/T=( t
: Start buffer. During this time the signal is always high. t
: Valid Data Output Band, 0 to 1/2T. PWM output data resolution is 10 bit.
: Error band – information for fatal error in EEPROM (double error detected, not correctable). t
min
max
min
max
min
max
=> Config Reg[5:4] = 11’b
= 0°C
= -5°C
= 0°C
= +50°C
= +105°C
= +50°C
high1
high2
/T)-0.125=0.13636 => Ta=+25.0°C,
/T)-1.125=0.370 => T
1
Figure 12: Extended PWM format with DUAL[5:1] = 01h (2 repetitions for each data)
, Tmax
2N+1=3 times Data1
=>
=>
=>
=>
=>
=>
1
obj1
=0.125*T, t
1
, Tmin
@ Data1 : Data2 => Config Reg[5:4] = 00b,
To
To
Ta
Ta
Ta
To
To
min
max
range
range
range
min
max
2
1
and Tmax
-t
obj1
[EEPROM] = 100 * (to
[EEPROM] = 100 * (To
[EEPROM] = 100 * (to
3
[EEPROM] = 100 * (To
3
, L [EEPROM] = 100*(Ta
,H [EEPROM] = 100*(Ta
=0.25*T and t
[EEPROM]=E034h
=+37.0°C.
have the following functions:
Tout
Tout
2
1
2
=
=
are given in Table 9, t
2
⎡
⎢
⎣
=(0.495 – 0.125)*T=0.370*T =>
⎡
⎢
⎣
2
2
T
T
t
t
4
5
=1.125*T. As shown in Figure 11, in extended PWM format the
2
*
*
Page 19 of 40
(
(
min
2N+1=3 times Data2
Tmax
Tmax
max
min
max
+ 273.15) = 6AB3h
max
min
+ 273.15) = 6AB3h
+ 273.15) = 7E3Bh
+ 273.15) = 7E3Bh
+38.2)/64 = 34h,
+38.2)/64 = E0h,
2
1
−
−
1
= 0.125*T (T is the PWM period, refer to fig. 11).
Tmin
Tmin
Infra Red Thermometer in TO-39
2
=t
1
2
high1
)
MLX90614 family
)
⎤
⎥
⎦
⎤
⎥
⎦
+
+
-t
1
Tmin
Tmin
, and t
1
2
5
Single and Dual Zone
=t
high2
-t
4
.
New Data 1
3
Data Sheet
03/Oct/2007
= 0.25 * T.
4
is