A rotation measurement solution using magnetic sensors that can be measured for a long period of time using battery power.

Rotation Detection Solution

The movement of the rotating body is converted into an electrical signal using magnetic sensors and coil sensors, and the rotation measurement is achieved by measuring the pulses. One of the main applications of this rotation measurement technology is gas and water meters which need to be battery powered and must operate for a long period of time.

In order to meet these requirements, Renesas offers rotation measurement solutions that utilize microcontrollers that operate in a low power consumption mode.


Devices suitable for rotation measurement

Renesas offers a wide lineup of devices suitable for battery-powered rotation measurements.

The RL78/I1D utilizes analog functions such as 12-bit A/D converters and window comparators along with a data transfer controller (DTC) to measure the rotation using coil sensors. In addition to low power consumption operation of 124μA at 1MHz, it is equipped with a medium-speed oscillator capable of 4μs high-speed wake-up which contributes to the miniaturization of batteries in the customer system. Also, we have a lineup of 20 to 48-pin small pin packages that are ideal for small sensor applications.

RL78/I1D System Diagram


The RL78/H1D utilizes a sampling output timer/detector function to perform rotation measurement using a magnetic sensor with low power consumption. Measurement results can be displayed on an external display with the LCD controller/driver that supports three LCD drive voltage generation methods (internal boost, capacity split and external resistance split). In addition, it is equipped with a UART that is capable of up to 19200bps communication in subsystem clock (38.4kHz) operation mode, allowing it to communicate externally at very low power, making it ideal for applications such as smart gas meters and smart water meters.

RL78/I1D System Diagram 2

*Bluetooth® Low Energy, Sub-GHz/Wi-SUN, LoRa® Solution


 Microcontroller Function Evaluation Board Solution Kit

There are two types of evaluation boards available, a flat coil-type rotation measurement solution kit using an RL78/I1D with a sampling output timer/detector, and an RL78/H1D evaluation board with external sampling function.


文档标题 language 类型 文档格式 文件大小 日期
RL78/H1D Datasheet 数据手册 PDF 1.52 MB
RL78/I1D Datasheet (R01DS0244EJ0220) 数据手册 PDF 968 KB
应用指南 & 白皮书
RL78 Troubleshooting of the LCD controller/driver 日本語 应用文档 PDF 269 KB
RL78/I1D Serial Array Unit (UART Communication) CC-RL 日本語 应用文档 PDF 409 KB
- RL78/I1D Serial Array Unit (UART Communication) CC-RL - Sample Code 日本語 样例程序 ZIP 770 KB