MAX35103
Reduced Power Time-to-Digital Converter with AFE, RTC, and Flash
Accurate Low Flow Measurement with Lowest System Power Consumption
Maxim Confidential 
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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
| 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 |
Technical Docs
Click any title below to view the detail page where available.
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.
View DetailsFeatures
- 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.
View DetailsFeatures
- 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
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
Parameters
| 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
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.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
Request a Quote