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PDF MLX90313 Data sheet ( Hoja de datos )
| Número de pieza | MLX90313 | |
| Descripción | Programmable IR Sensor Interface | |
| Fabricantes | Melexis Microelectronic | |
| Logotipo |  |
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MLX90313
Programmable IR Sensor Interface
Features and Benefits
Dual low noise, low offset, fully programmable amplifier chain
12 bit on-chip ADC
Powerful signal conditioning and linearisation unit
Multiple output options: 12 bit digital through SPI, 8 bit resolution analog linear signal outputs or
10 bit PWM, both for ambient and object temperature.
On-chip programmable digital moving average LPF for ultimate low noise performance
ISP I/O-configuration and analog settings, accessible by SPI serial interface.
Wide supply voltage range from 4.5V-80V
Applications
Thermopile + thermistor amplification chain
Digital or analog, linear, ambient-compensated IR sensor interface
General purpose programmable sensor amplifier/ signal conditioner
Ordering Information
Part No.
MLX90313
Temperature Suffix
K
Functional Diagram
Package
DF
Temperature Range
-40C to 125C Automotive
Description
IR+
IR-
Tinp
Tinn
Supply Regulator
IR path
PGA
A/D
12Bit
Thermistor
path
PGA
A/D
12Bit
Digital Control Logic
Configuration eeprom
pwm
lin
non
lin
pwm
lin
non
lin
IRout
Tempout
SPI
interface
SPI
interface
www.DataSheet4U.com
The MLX90313 is a versatile in-circuit
programmable interface, which performs signal
conditioning, linearisation and ambient
temperature compensation, particularly for
infrared sensors combined with a thermistor.
Other types of sensors can also be used in
various configurations. Sensors that can be used
include pressure sensors, strain gauges,
acceleration sensors etc.
The amplifier chains in MLX90313 are
programmable in very broad ranges of gain.
Both chains consist of high performance,
chopper-stabilized amplifiers, providing excellent
noise performance and low offset. The I/O
configuration as well as analog settings are in-
circuit programmable by means of the SPI-serial
interface. This serial link can also be used to
read out the output signals digitally. The circuit
can either provide linear analog or PWM (Pulse
Width Modulated) signal outputs. Additional the
circuit can perform simple control applications
using on-board comparators
MLX90313 Programmable IR sensor Interface Page 1
3901090313
Rev 1.0 21-July-2001
1 page  
MLX90313
Programmable IR Sensor Interface
Pin-out
TINP
TINN
IRINP
IRINN
VSS
REL1
IROUT
SDIN
TOUT1
TOUT2
1
2
3
4
5
6
7
8
9
10
20 TEMPOUT
19 CSB
18 SDOUT
17 SCLK
16 TSTCLK
15 VDD
14 VDD1
13 AGND
12 VREFP
11 CREF
Pin Symbol
1 TINP
2 TINN
3 IRINP
4 IRINN
5 VSS
6 REL1
7 IROUT
8 SDIN
9 TOUT1
10 TOUT2
11 CREF
12 VREFP
13 AGND
14 VDD1
15 VDD
16 TSTCLK
17 SCLK
18 SDOUT
19 CSB
20 TEMPOUT
Description
Temp-chain amplifier positive input
Temp-chain amplifier negative input
IR-chain amplifier positive input
IR-chain amplifier negative input
Supply pin
Open-drain relay driver output
IR-chain amplifier output
SPI data input
Test pin/ Oscillator output
Test pin, leave open
Bias current reference
Reference voltage input/output
Analog ground, band-gap reference voltage
Automotive Ignition supply pin
Regulated supply pin
Clock for test mode; leave open
SPI clock input
SPI data output
SPI chip select active low
Temp-chain amplifier output
www.DataSheet4U.com
MLX90313 Programmable IR sensor Interface Page 5
3901090313
Rev 1.0 21-July-2001
5 Page 
MLX90313
Programmable IR Sensor Interface
Analog-to-Digital Converter (ADC)
MLX90313 contains a 12-bit internal analog to digital converter. Real 12 bit conversion is achieved by a
fully differential signal path of the converter. The input amplifier of the ADC has a fixed gain of 3.
Automatic calibration is implemented in the background, which allows precise conversion in a very wide
temperature range. The ADC sampling rate is 7k samples/second. The reference voltage for the ADC is
normally a scaled version of the internal band-gap reference and is fixed to be 2.5V. Alternatively
MLX90313 can be configured to work with an external reference potential applied to the AGND pin. In
this case the appropriate bit in the configuration register (SELADREF bit in Confreg1) must be cleared.
Internal ADC can work with references down to 1 V keeping the 12-bit resolution.
The ADC contains an interface circuit to scale and offset the analog signals in order to make the most
efficient use of the available resolution. After amplification the IR and Temp sensor signals are referred to
AGND voltage level (typical value 2.5V). The additional offset is scaled version of the AGND.
The ADC interface circuit is given below. The output of the Temp-chain is amplified relative to the voltage
reference VrefT, which can be controlled with 2 bits (bit10 and bit9, EEPROM address 02h). The possible
values for VrefT can be calculated according to the equation:
VrefT = VAgnd ×1.4 × (63 + K ) , where K =0 to 3, corresponding to the value of the control bits.
70
The typical values are 3.15, 3.20, 3.25 and 3.3V. If the temp path amplifier is bypassed then VrefT will be
fixed to: Agnd x 0.28 = 0.7V typical.
The output of the IR-chain is amplified relative to Refir and can be calculated according to the following
equation:
Vrefir
=
VAgnd
×1.4 ×
70
(34
+
K
)
,
Where
K=0:31
depending
on
the
selected
value
of
Rsel[4:0]
The typical values (for Agnd=2.5V) are listed in the table below:
ADC interface setting
RSEL[4:0]
Refir [V] RSEL[4:0]
Refir [V] RSEL[4:0]
Refir [V]
11111b
3.25 10111b
2.85 01111b
2.45
11110b
3.20 10110b
2.80 01110b
2.40
11101b
3.15 10101b
2.75 01101b
2.35
11100b
3.10 10100b
2.70 01100b
2.30
11011b
3.05 10011b
2.65 01011b
2.25
11010b
3.00 10010b
2.60 01010b
2.20
11001b
2.95 10001b
2.55 01001b
2.15
11000b
2.90 10000b
2.50 01000b
2.10
RSEL[4:0]
00111b
00110b
00101b
00100b
00011b
00010b
00001b
00000b
Refir [V]
2.05
2.00
1.95
1.90
1.85
1.80
1.75
1.70
www.DataSheet4U.com
MLX90313 Programmable IR sensor Interface Page 11
3901090313
Rev 1.0 21-July-2001
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MLX90313.PDF ] | |
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