Water meters, like most systems, are seeing advancements in measurement and precision. One key driver for this change is the metrology methodology transitioning from mechanical-based to electronic sensors, such as Hall sensors or ultrasound. Another introduction is automatic meter reading (AMR) technology, integrating into LoRa, Bluetooth® Low Energy (LE), NB-IoT, and other communication standards.

Renesas has developed a solution based on a tunnel magnetoresistance (TMR) sensor, which enables lower power consumption and extends battery life to 5-7 years (as required in the market).

System Benefits:

  • Ultra-low power consumption, as a result of TMR and RL78/H1D’s ability to directly drive sensors without CPU wakeup
  • Electronic design, eliminating mechanical metering and improving reliability
  • Ability to integrate additional control functionality and monitoring



Winning Combinations Interactive Diagram

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4:3 ratio Sheet.1 Sheet.2 Sheet.3 Sheet.4 CN215 CN215 CN215 LDO LDO LDO Motor Sheet.15 Sheet.16 M M LCD/LED Segment Display Sheet.18 Sheet.19 Sheet.20 Sheet.21 Sheet.22 Sheet.23 Sheet.24 Sheet.25 Sheet.26 Sheet.27 Sheet.28 Sheet.29 Sheet.30 Sheet.31 Sheet.32 Sheet.33 Sheet.34 Sheet.35 Sheet.36 Sheet.37 Sheet.38 Sheet.39 Sheet.40 Sheet.41 Sheet.42 Sheet.43 Sheet.44 Sheet.45 Sheet.46 Sheet.47 ON ON Sheet.48 OFF OFF Sheet.49 Sheet.50 Sheet.51 Sheet.52 Sheet.53 Sheet.54 Sheet.55 Sheet.56 Comm Comm Comm TMR Sensor TMR Sensor TMR Sensor Solenoid or Relay Solenoid or Relay Solenoid or Relay Battery.27 Sheet.62 Sheet.63 Sheet.64 LCD LCD LCD Optional Non-Renesas Component 11pt text 11pt text Clock Generator Clock Generator Clock Generator Sheet.68 Sheet.69 Sheet.70 Sheet.71 Sheet.72 Sheet.73 Sheet.75 Sheet.76 Sheet.78 Sheet.79 Sheet.80 Sheet.81 Sheet.82 Sheet.83 Sheet.84 Sheet.85 Connector 1.158 6V 6V 6V 3.3V 3.3V 3.3V 6V 6V 6V 32.768K 32.768K 32.768K 20M 20M 20M Optional Optional Optional Sheet.93 MCU MCU MCU OPA OPA OPA GPIO GPIO GPIO LCDC LCDC LCDC UART UART UART 10-bit ADC 10-bit ADC 10-bitADC
Exiting Interactive Block Diagram