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Reduced Power Time-to-Digital Converter with AFE, RTC, and Flash

Accurate Low Flow Measurement with Lowest System Power Consumption

Product Details

The MAX35103 is a time-to-digital converter with built-in amplifier and comparator targeted as a low-cost analog front-end solution for the ultrasonic heat meter and flow meter markets. It is similar to the MAX35101, but consumes about half the average power and increases the maximum ToF measurement frequency in event timing mode from 2Hz to 16Hz.

With a time measurement accuracy of 20ps and automatic differential time-of-flight (ToF) measurement, this device makes for simplified computation of liquid flow.

Average power consumption is the lowest available with ultra-low 5.5μA ToF measurement and < 125nA duty-cycled temperature measurement.

Key Features

  • High Accuracy Flow Measurement for Billing and Leak Detection
    • Time-to-Digital Accuracy Down to 20ps
    • Measurement Range Up to 8ms
    • Two Channels: Single-Stop Channel
  • High Accuracy Temperature Measurement for Precise Heat and Flow Calculations
    • Up to Four 2-Wire Sensors
    • PT1000 and PT500 RTD Support
  • Maximizes Battery Life with Low Device and Overall System Power
    • Ultra-Low 5μA ToF Measurement and < 125nA Duty-Cycled Temperature Measurement
    • Event Timing Mode Reduces Host Microcontroller Overhead to Minimize System Power Consumption
    • 2.3V to 3.6V Single-Supply Operation
  • High-Integration Solution Minimizes Parts Count and Reduces BOM Cost
    • 8KB of Nonvolatile Flash Memory for Data Logging
    • Built-in Real Time Clock
    • Small, 5mm x 5mm, 32-Pin TQFP Package
    • -40°C to +85°C Operation

Applications/Uses

  • Ultrasonic Gas Meters
  • Ultrasonic Heat Meters
  • Ultrasonic Water Meters
Parametric specs for Sensor Signal Conditioners
Sensing Element Ultrasonic Piezoelectric Transducer
PGA Gain Fixed
Calibration Method External microcontroller
Output Type Digital
ICC (mA) (typ) 0.006
Interface SPI
VSUPPLY (V) 2.3 to 3.6
Package/Pins TQFP/32
Budgetary
Price (See Notes)
$4.97 @1k
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Simplified Block Diagram

MAX35103: Typical Application Circuit MAX35103: Typical Application Circuit Zoom icon

Design & Development

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Description

The MAX35103 evaluation kit (EV kit) provides the hardware and graphical user interface (GUI) software necessary to evaluate the MAX35103 time-to-digital converter designed for ultrasonic heat, water, and gas meters. The EV kit includes a MAX35103EHJ+ installed, as well as the required USB-to-SPI interface needed to communicate with the IC. The USB-to-SPI master section of the EV kit, along with the EV kit software, provides a quick method to exercise the device’s functionality.

The EV kit can be powered by the USB to simplify an evaluation setup, but also comes equipped with banana jacks that enable an external supply, such as a battery, to power the system. Provided BNC connectors allow for quick connection to piezoelectric transducers housed in a spool body. The provided terminal-block connectors allow for easy connection to the two remote platinum RTDs.

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Features

  • Easy Evaluation of the MAX35103
  • Two Piezoelectric Transducers and Two RTD Connections Provided
  • EV Kit Hardware Optionally USB Powered (USB Cable Included)
  • USB HID Interface
  • Windows XP®- and Windows® 7-Compatible Software
  • RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX35103EVKIT2 provides an application example using the MAX35103 time-to-digital converter to measure water flow as part of an off-the-shelf residential irrigation system. The kit includes a PCB and ultrasonic transducer assembly that can be added to standard 24VAC irrigation systems to provide enhanced shut-off irrigation control.

The kit features a MAX32620 Arm® Cortex®-M4 low-power MCU that executes application firmware. Debug support is provided by a 10-pin JTAG connector and a 3.3V TTL UART connector. Future Mbed™ support is provided by the included MAX32625PICO module.

The kit is designed to be inserted between a 24VAC irrigation controller and an irrigation valve. The valve and controller are optional and are not included but can easily be obtained at most home improvement retailers.

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Features

  • Easy Evaluation of the MAX35103 in an Embedded Environment.
  • Audiowell Ultrasonic DN20 Ultrasonic Transducer Assembly
  • IAR Arm Development Environment Supported
  • Flexible Input Power Options for Desktop or Field Development Enabled by the MAX15062

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Support & Training

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Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Parametric specs for Sensor Signal Conditioners
Sensing Element Ultrasonic Piezoelectric Transducer
PGA Gain Fixed
Calibration Method External microcontroller
Output Type Digital
ICC (mA) (typ) 0.006
Interface SPI
VSUPPLY (V) 2.3 to 3.6
Package/Pins TQFP/32
Budgetary
Price (See Notes)
$4.97 @1k

Key Features

  • High Accuracy Flow Measurement for Billing and Leak Detection
    • Time-to-Digital Accuracy Down to 20ps
    • Measurement Range Up to 8ms
    • Two Channels: Single-Stop Channel
  • High Accuracy Temperature Measurement for Precise Heat and Flow Calculations
    • Up to Four 2-Wire Sensors
    • PT1000 and PT500 RTD Support
  • Maximizes Battery Life with Low Device and Overall System Power
    • Ultra-Low 5μA ToF Measurement and < 125nA Duty-Cycled Temperature Measurement
    • Event Timing Mode Reduces Host Microcontroller Overhead to Minimize System Power Consumption
    • 2.3V to 3.6V Single-Supply Operation
  • High-Integration Solution Minimizes Parts Count and Reduces BOM Cost
    • 8KB of Nonvolatile Flash Memory for Data Logging
    • Built-in Real Time Clock
    • Small, 5mm x 5mm, 32-Pin TQFP Package
    • -40°C to +85°C Operation

Applications/Uses

  • Ultrasonic Gas Meters
  • Ultrasonic Heat Meters
  • Ultrasonic Water Meters

Description

The MAX35103 is a time-to-digital converter with built-in amplifier and comparator targeted as a low-cost analog front-end solution for the ultrasonic heat meter and flow meter markets. It is similar to the MAX35101, but consumes about half the average power and increases the maximum ToF measurement frequency in event timing mode from 2Hz to 16Hz.

With a time measurement accuracy of 20ps and automatic differential time-of-flight (ToF) measurement, this device makes for simplified computation of liquid flow.

Average power consumption is the lowest available with ultra-low 5.5μA ToF measurement and < 125nA duty-cycled temperature measurement.

Simplified Block Diagram

MAX35103: Typical Application Circuit MAX35103: Typical Application Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal