Overview

Flow sensors are used in many industrial device applications to measure the flow of liquids and gases. Here is an example of a block diagram where the signal from the MEMS sensor using a thermopile is processed by the analog front-end via the built-in operational amplifier and microcontroller, and the measurement result is output via display and communication functions.

Renesas offers a wide range of products, from microcontrollers with built-in analog front-ends required for flow measurement, general-purpose microcontrollers for main control with communication and display functions, to drivers for communication with high-end equipment and peripheral parts. The FS1012 is a sensor with a MEMS sensor and flow measuring area that can measure non-corrosive gases and liquid media. Higher SN ratio performance in sensing can be achieved using a thermocouple, which is also ideal for low power consumption measurements.

Block Diagram

Flow sensor block diagram

Recommended Products

Microcontroller

Block Recommended Products Features
Analog Front-End MCU RA2A1 This features a high-performance Arm® Cortex®-M23 core.It has a variety of digital peripheral functions and 24-bit ⊿ΣADC and 16-bit SARADC analog functions, along with measuring and processing analog signals from sensors; it can also be used with a USB or touch human interface.
RL78/I1E Equipped with analog front-end including an optimal 24-bit ΔΣA/D converter for flow rate, pressure, weight, and distortion measurement, etc., for where high-precision measurement is required, such as for industrial equipment and environmental infrastructure, along with a 12-bit D/A converter and configurable amplifier installed in the low-power RL78 microcontroller. The small 4 mm x 4 mm package contributes to miniaturization of the application.
Sub-MCU for Display RL78/L13 RL78/L13 microcontrollers have a built-in segment LCD driver. Three LCD driving voltage generation methods (external resistance division, capacitive split, and internal voltage boost) are supported, corresponding to a variety of segment LCD panels. Our lineup of products with 64/80 pins and up to 376 segments is ideal for equipment equipped with LCD panels such as measuring instruments.

Sensor

Block Recommended Products Features
Sensor FS1012 The FS1012 is a sensor with a MEMS sensor and flow measuring area that can measure non-corrosive gases and liquid media. Higher SN ratio performance in sensing can be achieved using a thermocouple, which is also ideal for low power consumption measurements.

Communications Driver

Block Recommended Products Features
Communications ZIOL2201 ZIOL2201 is a driver/level shifter IC that supports the communications physical layer of industrial equipment such as sensors and actuators. It is IO Link compliant and can be widely used in a wide range of sensor/actuator application equipment.
ISL32704E ISL32704E is an RS-485 differential bus transceiver that enables two-way communication in industrial IoT networks.
ASI4U-V5 ASI4U-V5 ASSP (Application Specific Standard Product) is the industry's first silicon solution that fully meets the ASi-5 (Actuator Sensor Interface Version 5) standard for industrial networking equipment and is ideal for applications in the Industry 4.0 field. (Currently under development)

Analog and Power

Block Recommended Products Features
Power Supply
DC/DC
RAA23015x
  • Main specifications:
    Input voltage range: 7 to 28V
    Output voltage range: 0.8 to 6V
    Maximum output current: 3A
    Auto PFM (light load, high efficiency) mode
  • Simplify power supply design and shorten turnaround time (TAT) with suggested kits and Renesas microcontrollers.
RAA23023x
  • Main specifications: Input voltage range: 4.5 to 16V
    Output voltage range: 0.8 to 6V
    Maximum output current: 3A
    Auto PFM (light load, high efficiency) mode
    Dual channel DC/DC
  • Simplify power supply design and shorten turnaround time (TAT) with suggested kits and Renesas microcontrollers.
Isolator /
High-speed Communication Photocoupler /
General-purpose (Tr output) Photocoupler
PS9001
  • Main specifications: 10Mbps small package high voltage
    Small type SO5 package
    Common lead package
  • Ideal for compact systems with high voltage tolerance
PS9123
PS9124

Please see Renesas' comprehensive "Winning Combination" solutions for other solutions.