EVALUATION KIT AVAILABLE MAX35103 Reduced Power Time-to-Digital Converter with AFE, RTC, and Flash General Description Benefits and Features The MAX35103 is a time-to-digital converter with built-in High Accuracy Flow Measurement for Billing and amplifier and comparator targeted as a low-cost analog Leak Detection front-end solution for the ultrasonic heat meter and flow Time-to-Digital Accuracy Down to 20ps meter markets. It is similar to the MAX35101, but con- Measurement Range Up to 8ms sumes about half the average power and increases the Two Channels: Single-Stop Channel maximum ToF measurement frequency in event timing High Accuracy Temperature Measurement for Precise mode from 2Hz to 16Hz. Heat and Flow Calculations Up to Four 2-Wire Sensors With a time measurement accuracy of 20ps and auto- PT1000 and PT500 RTD Support matic differential time-of-flight (ToF) measurement, this device makes for simplified computation of liquid flow. Maximizes Battery Life with Low Device and Overall System Power Average power consumption is the lowest available with Ultra-Low 5A ToF Measurement and < 125nA ultra-low 5.5A ToF measurement and < 125nA duty- Duty-Cycled Temperature Measurement cycled temperature measurement. Event Timing Mode Reduces Host Microcontroller Overhead to Minimize System Power Consumption Applications 2.3V to 3.6V Single-Supply Operation Ultrasonic Heat Meters High-Integration Solution Minimizes Parts Count and Ultrasonic Water Meters Reduces BOM Cost Ultrasonic Gas Meters 8KB of Nonvolatile Flash Memory for Data Logging Built-in Real Time Clock Small, 5mm x 5mm, 32-Pin TQFP Package -40C to +85C Operation Ordering Information appears at end of data sheet. 19-7361 Rev 1 1/15MAX35103 Reduced Power Time-to-Digital Converter with AFE, RTC, and Flash Typical Application Circuit GND GND GND GND GND 3.6V CMP OUT/UP DN CSW STOP UP ANALOG DATA AND SWITCHING TIME-TO-DIGITAL PROGRAMMABLE WDO STATUS AND BIAS CONVERTER ALU REGISTERS CONTROL INT STOP DN RST 3.6V VCC SCK MICROCONTROLLER V CC MAX35103 DOUT V CC INTERNAL 8KB DIN BYPASS LDO FLASH CE 100nF STATE MACHINE 4-WIRE LOW ESR CONTROLLER INTERFACE LAUNCH UP CONFIGURATION PULSE REGISTERS LAUNCH DN LAUNCHER PIEZOELECTRIC TRANSDUCERS HIGH-SPEED AND 32kHz OSCILLATORS TEMPERATURE MEASUREMENT WITH REAL-TIME CLOCK 32KX1 32KOUT X1 X2 32KX0 T1 T2 T3 T4 TC 4MHz 32.768kHz 1k (50ppm) METAL FILM 12pF 12pF 12pF 12pF 100 nF COG (NP0) (30ppm/C) Maxim Integrated 2 www.maximintegrated.com PT 1000 PT 1000