EVB90614 Melexis Inc, EVB90614 Datasheet - Page 23
![BOARD EVAL FOR MLX90614](/photos/9/18/91832/evb90614_sml.jpg)
EVB90614
Manufacturer Part Number
EVB90614
Description
BOARD EVAL FOR MLX90614
Manufacturer
Melexis Inc
Specifications of EVB90614
Sensor Type
Temperature
Sensing Range
-40°C ~ 125°C
Interface
SMBus (2-Wire/I²C)
Embedded
Yes, MCU, 8-Bit
Utilized Ic / Part
MLX90614
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Supply
-
Sensitivity
-
8.5.2 Extended PWM format
The PWM format for extended PWM is shown in Figure 15. 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 15.
The temperature transmitted in Data 1 field can be calculated using the following equation:
For Data 2 field the equation is:
Time bands are: t
error_band1 + stop1 + start2). As shown in Figure 13, in extended PWM format the 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.
3901090614
Rev 006
0
0
Figure 16: Example: Extended PWM mode readings – sensor 1 above and sensor 2 bellow
Figure 15: Extended PWM format with DUAL [5:1] = 01h (2 repetitions for each data)
Start
Start
t=16.875ms
t1
16
16
1
1
T
T
t2
1
=0.0625*T (Start1), t
Tout
Tout
t1
t=73.125ms
2
1
Extended PWM mode sensor 1
Extended PWM mode sensor 2
=
=
T=100ms (PWM = 10Hz)
T=100ms (PWM = 10Hz)
3
4
4
=0.125*T and t
T
T
t
t
5
2
*
*
Page 23 of 49
(
(
Tmax
Tmax
16
16
8
8
2
1
T
T
−
−
Tmin
Tmin
4
=0.5625*T (Start2 = Start1 + Valida_data1 +
Infra Red Thermometer in TO-39
1
2
)
)
+
+
t2
Tmin
Tmin
1
2
t3
Single and Dual Zone
September 30, 2010
15
16
15
16
T
T
Data Sheet
T
T