Gen 2 rain-light sensor interface IC
MLX75310 Melexis
The MLX75310 is a rain-light sensor interface chip, including an integrated LED driver. The IC provides various auxiliary circuit functions to support the main mission of the rain-light sensor, for example, a watchdog function, bias and reference sources, and clock generators to control and drive the various on-chip functions. In addition, an SPI interface is included to support data exchange between the IC and a microcontroller.
Top features
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Integrated LED driver saving not only cost but also space
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High safety design by several diagnostic and monitoring functions
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Minimum amount of external components
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QFN4x4 (24 pins) package
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Easy digital communication interface via SPI
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Two independently simultaneously operating rain measurement channels
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Integrated DC light cancellation circuitry for rain channel DC light suppression
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Integrated compensation for DC light induced photodiode gain modulation
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Up to three logarithmic ambient light channels with two different sensitivities
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Integrated battery voltage monitor
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Integrated LED temperature sensing circuitry
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High input capacitance tolerant input current terminals
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Extremely high degree of adaptability for different optical systems (transparency…)
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Stand-by and sleep modes for low power consumption
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Integrated 16 Bit ADC for high resolution A2D conversion
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Integrated Temperature Sensor
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Integrated watchdog timer
Gen 2 rain-light sensor interface IC - MLX75310
Product description
The MLX75310 is a Gen 2 rain-light sensor interface chip. Unlike the MLX75308, the MLX75310 includes an integrated LED driver. The IC provides various auxiliary circuit functions to support the main mission of the rain-light sensor, for example, a watchdog function, bias and reference sources, and clock generators to control and drive the various on-chip functions. In addition, an SPI interface is included to support data exchange between the IC and a microcontroller.
The IC consists of two optical sensor parts. Part one is optimized for optical rain detection and is designed to transmit and receive modulated light signals used for optical rain detection. The rain detection feature is available in two independent operating measurements input-channels A and B.
Part two consists of three logarithmic current sensors C, D, and E, which can measure the photocurrent of externally connected photodiodes. Simple operation is ensured by internal control logic, configurable user registers, and SPI communication.
For higher system integration and cost optimization, the LED driver is embedded in the IC. Once added next to your microcontroller, the MLX75310 can be controlled via SPI commands
Application Examples
- Optical rain-detection systems
- Optical liquid level metering
- Ambient light sensing
- global irradiation
- forefield sensor
- head-up display
Features and benefits
-
Integrated LED driver saving not only cost but also space
-
High safety design by several diagnostic and monitoring functions
-
Minimum amount of external components
-
QFN4x4 (24 pins) package
-
Easy digital communication interface via SPI
-
Two independently simultaneously operating rain measurement channels
-
Integrated DC light cancellation circuitry for rain channel DC light suppression
-
Integrated compensation for DC light induced photodiode gain modulation
-
Up to three logarithmic ambient light channels with two different sensitivities
-
Integrated battery voltage monitor
-
Integrated LED temperature sensing circuitry
-
High input capacitance tolerant input current terminals
-
Extremely high degree of adaptability for different optical systems (transparency…)
-
Stand-by and sleep modes for low power consumption
-
Integrated 16 Bit ADC for high resolution A2D conversion
-
Integrated Temperature Sensor
-
Integrated watchdog timer
