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TDC-GP21
TDC-GP21
The TDC-GP21 is an advanced ultrasonic flow and heat meter converter, offering enhanced features over its predecessor, the TDC-GP2. It is designed for ultra-compact, low-cost applications with reduced operating current. Key improvements include a chopper-stabilized comparator, analog switches, and a low-power oscillator driver.
- Measurement Mode 2: Provides resolutions of 90 ps, 45 ps, and 22 ps with a range of 700 ns to 4 ms.
- Analog Input Circuit: Includes a chopper-stabilized comparator and integrated analog switches.
- Temperature Measurement Unit: Supports 2 or 4 sensors with ultra-low current consumption.
- Special Functions: Features a fire pulse generator, low-power oscillator, and EEPROM.
- Measurement Mode 1: Allows up to 500,000 measurements per second with high resolution.
- General: Operates within a temperature range of -40°C to +85°C, housed in a QFN 32 package.
- Electrical Characteristics: Maximum supply voltage is 4.0 V, with a storage temperature range of -55 to 150°C.
- DC Characteristics: Minimal operating current with specific values for different oscillators and measurement units.
- Analog Frontend: Features low offset voltage and switch-on resistance specifications.
- EEPROM: Offers data retention of 10 years at 85°C.
- Time Measuring Unit: Provides high resolution and standard deviation values for different measurement modes.
- Temperature Measuring Unit: Offers high resolution and gain stability across different conditions.
- Oscillator: Specifications for start-up times and recommended use of ceramic oscillators.
- Serial Interface: Details on serial clock frequency and timing parameters for SPI compatibility.
- SPI Read Disable Timings: Setup and hold times for enabling and disabling SPI read operations.
- Reset Timings: Reset pulse width and delay specifications for communication readiness.
Detailed pinout description, including functions and buffer types for each pin, such as XIN, XOUT, VIO, VCC, FIRE_UP, FIRE_DOWN, INTN, SSN, SCK, SI, and SO.
Housed in a QFN-32 package, RoHS compliant, with specific dimensions and thermal resistance. Soldering temperature profile must not exceed 250ºC for more than 10 seconds.
Requires a stable power supply with low inductance and high capacitance. Recommended capacitance values are 47 to 100 µF for VCC and 100 µF for VIO.
Details various current consumption scenarios, including quiescent current, standby current, and current during active measurement.
Features 7 configuration registers, each 32 bits, with detailed configuration parameters and default values.
Registers are used to set operational modes and parameters, such as pulse generation, calibration settings, and measurement modes.
- Register Configuration: Specific bit settings for enabling interrupts, setting delay values, and configuring pulse outputs.
- Measurement Modes: Mode 1 allows for negative results and non-calibrated measurements, while Mode 2 supports only positive, calibrated measurements.
- Stores configuration data and ID/version numbers with error correction using Hamming code.
- Data retention guaranteed for over 10 years at 85°C.
- Use low current settings for oscillators to save power.
- Ensure no measurements are running when writing to EEPROM to prevent data corruption.
- Regularly compare EEPROM content to maintain data integrity.
Features a 4-wire SPI interface, supporting one SPI mode with specific clock phase and polarity settings.
Various opcodes for operations such as writing to addresses, reading from addresses, and EEPROM operations.
Operates with a measurement range from 3.5 ns to 2.4 µs, with a typical resolution of 90 ps.
Requires configuration for measurement mode, reference clock selection, and calibration settings.
ALU processes data post-measurement, performing calibration calculations and transferring results to the output register.
Data can be read by sending the appropriate opcode, with data sent in 16 or 32 clock cycles.
Utilizes a time-to-digital converter (TDC) for precise measurements, with a high-speed clock for calibration and measurement operations.
Comparator's offset can be adjusted to detect the first pulse accurately.
Includes a PICOSTRAIN-based temperature measuring unit, supporting PT500 and PT1000 sensors.
Registers control dummy measurements, cycle time, and port usage, with error detection for sensor issues.
Uses a high-speed oscillator for calibration and measurement, with a 32.768 kHz oscillator for clock calibration.
Use capacitors with low dC/dU for accurate temperature measurements and maintain low current consumption.
Involves measuring time intervals using a 32.768 kHz clock and a TDC unit for frequency error calculation.
Highly programmable, allowing control over frequency, phase, and number of pulses.
Offers a fast initialization mode for high-speed applications.
Introduces random offsets to improve measurement accuracy.
Recommendations for improving EMC susceptibility, such as using ferrite cores and shielded cables.
Ideal for low-cost ultrasonic heat meters, supporting precision temperature measurement and clock calibration.
Outlines configuration and operation, including interrupt configurations and measurement cycles.
Involves a power-on reset, loading configurations from EEPROM, and calibrating the clock.
Identifies bugs and provides workarounds, such as ensuring an INIT command is sent after interrupts.
Includes a detailed version history, noting changes and corrections.
Concludes with contact details for acam messelectronic gmbh.
Catalog excerpts
acam-messelectronic gmbH is now Member of the ams Group The technical content of this acam-messelectronic document is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: [email protected] Please visit our website at www.ams.com
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TDC-GP21 Universal 2-Channel Time-to-Digital Converters March 13th 2014 Document-No: DB GP21 en V1.6
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TDC-GP21 Published by acam-messelectronic gmbh ©acam-messelectronic gmbh 2014 Disclaimer / Notes “Preliminary” product information describes a product which is not in full production so that full information about the product is not available yet. Therefore, acam-messelectronic gmbh (“acam”) reserves the right to modify this product without notice. The information provided by this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by acam for its use, nor for any infringements of patents or other rights of third parties that may result from its use. The...
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ai-am mess electronic acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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1 -2 acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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TDC-GP211 Overview TDC-GP21 is next generation's upgrade for TDC-GP2. It offers pin-to-pin and functional compatibility, several feature improvements and an extended functionality. Analog elements like a chopper stabilized comparator and analog switches simplify external circuits in a significant manner. In parallel, measurement quality is improved and operating current is reduced. The firepulse generator is extended, a new low-power 32 kHz oscillator driver is implemented and the temperature measuring unit is further improved. All in all, the TDC-GP21 is perfectly suited to design ultra-compact...
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Ultrasonic-Flow-Converter Special Functions • Fire pulse generator, up to 127 pulses • Trigger to rising and/or falling edge • Precise stop enable by windowing • Low-power 32 kHz oscillator (500 nA) • Clock calibration unit • 7x32 Bit EEPROM Measurement mode 1 • 2 channels with typ. 90 ps resolution • channel double resolution with typ. 45 ps • Range 3.5 ns (0 ns) to 2.5 ps • 20 ns pulse-pair resolution, 4-fold multihit • Up to 500 000 measurements per second in measurement mode 1 ■ 4-wire SPI interface ■ 500 kHz continuous data rate max. ■ I/O voltage 2.5 V to 3.6 V ■ Core voltage 2.5 V to 3.6...
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Low-power clock control unit Fire pulse Control unit FIRE DOWN Configuration registers Analog section Package Package Oty; Carrier Order number This product is RoHS compliant and does not contain any Pb. acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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1 -6 acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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TDC-GP212 Characteristics & Specifications2.1 Electrical Characteristics Absolute Maximum Ratings Supply voltage Vcc vs. GND Vio vs. GND Vin Storage temperature (Tstg) ESD rating (HBM), each pin Junction temperature (Tj) Recommended Operating Conditions acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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Ultrasonic-Flow-Converter2.2 Converter Specification Time Measuring Unit (Vio = Vcc = 3.0 U, Tj = 25°C) 2-4 acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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TDC-GP21 Figure 2-1 Relative Variation of un-calibrated least significant bit with temperature and supply voltage, reference 3.0V/25°C Temperature Measuring Unit Symbol Internal Schmitt trigger external Schmitt trigger acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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PT500 (C0G-type) 2 measured with external 74AHC14 Schmitt trigger 3 compared to an ideal gain of 1 2-6 acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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TDC-GP21 2.3 Timings At Vcc = 3.0 V ± 0.3 V, ambient temperature -40 °C to +85 °C unless otherwise specified Oscillator acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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STOP EN_Stop 2-8 acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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Figure 2-5 Reset Timings acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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2-10 acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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* Rdson temperature ports: typ. 1.8 Q @ 3.0 V acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de 2-11
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Package Drawings Figure 2-7 QFN-32 package outline, 5 x 5 x 0.9 mm³, 0.5 mm lead pitch Caution: Center pad, 3.70 * 3.70 mm², is internally connected to GND. No wires other than GND are allowed underneath. It is not necessary to connect the center pad to GND. Suitable socket: Plastronics 32QN50S15050D Landing Pattern: acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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TDC-GP21 Thermal resistance: Roughly 28 K/W (value just for reference). Environmental: The package is RoHS compliant and does not contain any Pb. Moisture Sensitive Level (MSL) Based on JEDEC 020 Moisture Sensitivity Level definition the TDC -GP21 is classified as MSL 1. Soldering Temperature Profile The temperature profile for infrared reflow furnace (in which the temperature is the resin’s surface temperature) should be maintained within the range described below. Figure 2-9 Soldering profile acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
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Maximum temperature The maximum temperature requirement for the resin surface, given 260ºC as the peak temperature of the package body’s surface, is that the resin surface temperature must not exceed 250ºC for more than 10 seconds. This temperature should be kept as low as possible to reduce the load caused by thermal stress on the package , which is why soldering for short periods only is recommended. In addition to using a suitable temperature profile, we also recommend that you check carefully to confirm good soldering results. Date Code: YYWWA: YY = Year, WW = week, A = Assembly site code...
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