PT 1000 PT 1000 EVALUATION KIT AVAILABLE MAX35102 Time-to-Digital Converter Without RTC General Description Features and Benefits The MAX35102 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 with a Measurement Range Up to 8ms reduced feature set and without a real-time clock (RTC). 2 ChannelsSingle-Stop Channel The package size has been reduced to 4mm x 4mm x High-Accuracy Temperature Measurement for 0.75mm with 0.4mm pin pitch. Precise Heat and Flow Calculations With a time measurement accuracy of 20ps and auto- Up to Four 2-Wire Sensors PT1000 and PT500 RTD Support matic differential time-of-flight (ToF) measurement, this device makes for simplified computation of liquid flow. 40mK Accuracy Power consumption is the lowest available with ultra-low Maximizes Battery Life with Low Device and Overall System Power 5.5A ToF measurement and < 125nA duty-cycled tem- perature measurement. Ultra-Low 5.5A ToF measurement and < 125nA Duty-Cycled Temperature Measurement 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 Small, 4mm x 4mm, 32-Pin TQFN Package -40C to +85C Operation Ordering Information appears at end of data sheet. System Block Diagram CMP OUT/UP DN GND STP UP DATA AND ANALOG SWITCHING TIME-TO-DIGITAL INTX PROGRAMMABLE ALU STATUS AND BIAS CONTROL CONVERTER REGISTERS STP DN RSTX 3.6 V VCC SCK INTERNAL MICROCONTROLLER LDO BYPASS DOUT STATE MACHINE 100 NF LOW ESR CONTROLLER 4-WIRE INTERFACE LAUNCH UP CONFIGURATION DIN PULSE LAUNCHER REGISTERS LAUNCH DN CEX PIEZOELECTRIC TRANSDUCERS HIGH SPEED AND 32 KHZ OSCILLATORS TEMPERATURE MEASUREMENT T1 T2 T3 T4 TC 32KOUT X1 X2 32KX1 32KXO 1K (50 PPM) METAL FILM 32.768 KHZ 4 MHZ 12 PF 12 PF 12 PF 100 NF COG (NP0) (30 12 PF PPM/C) 19-7442 Rev 0 11/14MAX35102 Time-to-Digital Converter Without RTC Absolute Maximum Ratings (Voltages relative to ground.) Operating Temperature Range ........................... -40C to +85C Voltage Range on V Pins.................................-0.5V to +4.0V Junction Temperature ......................................................+150C CC Voltage Range on All Other Pins Storage Temperature Range ............................ -55C to +125C (not to exceed 4.0V) ............................. -0.5V to (V + 0.5V) Lead Temperature (soldering, 10s) .................................+300C CC Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) .......................................+260C A TQFN (derate 29.40mW/C above +70C) ...........2352.90mW ESD Protection (All Pins, Human Body Model) ..................2kV Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Thermal Characteristics (Note 1) TQFN Junction-to-Ambient Thermal Resistance ( ) ..........34C/W Junction-to-Case Thermal Resistance ( ) .....................3C/W JA JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Recommended Operating Conditions (T = -40C to +85C, unless otherwise noted.) (Notes 2, 3) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 2.3 3.0 3.6 V CC Input Logic 1 V V x 0.7 V + 0.3 V CC CC IH (RST, SCK, DIN, CE) Input Logic 0 V -0.3 V x 0.3 V CC IL (RST, SCK, DIN, CE) Input Logic 1 (32KX1) V V x 0.85 V + 0.3 V CC CC IH32KX1 Input Logic 0 (32KX1) V -0.3 V x 0.15 V IL32KX1 CC Electrical Characteristics (V = 2.3V to 3.6V, T = -40C to +85C, unless otherwise noted. Typical values are at V = 3.0V and T = +25C.) (Notes 2, 3) CC A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Leakage I -0.1 +0.1 A L (RST, SCK, DIN, CE) Output Leakage O -0.1 +0.1 A L (INT, T1,T2,T3,T4) Output Voltage Low (32KOUT) V 2mA 0.2 x V V OL32K CC Output Voltage High (32KOUT) V -1mA 0.8 x V V OH32K CC Output Voltage High V -4mA 0.8 x V V OH CC (DOUT, CMP OUT/UP DN) Output Voltage High (TC) V V = 3.3V, I = -4mA 2.9 3.1 V OHTC CC OUT Output Voltage High V V = 3.3V, I = -50mA 2.8 3.0 V OHLAUCH CC OUT (Launch UP, Launch DN) Output Voltage Low (INT, DOUT, V 4mA 0.2 x V V OL CC CMP OUT/UP DN) Maxim Integrated 2 www.maximintegrated.com