The MAX35101 is a time-to-digital converter with built-in
amplifier and comparator targeted as a complete analog
front-end (AFE) solution for the ultrasonic heat meter and
flow meter markets.
With a time measurement accuracy of 20ps and automatic
differential time-of-flight (TOF) measurement, this
device makes for simplified computation of liquid flow.
Early edge detection ensures measurements are made
with consistent wave patterns to greatly improve accuracy
and eliminate erroneous measurements.
Multihit capability with stop-enable windowing allows
the device to be fine-tuned for the application. Internal
analog switches, an autozero amplifier/comparator, real-time
clock (RTC), and programmable receiver sensitivity
provide the analog interface and control for a minimal
electrical bill of material solution. The RTC provides an
event timing mode that is configurable and runs cyclic
algorithms to minimize microprocessor interactivity and
increase battery life.
Built-in arithmetic logic unit provides TOF difference measurements.
A programmable receiver hit accumulator can
be utilized to minimize the host microprocessor access
and thus minimize current consumption.
For temperature measurement, the MAX35101 supports
up to four (4) 2-wire PT1000/500 platinum resistive temperature
detectors (RTD).
A simple 4-wire SPI interface allows any microcontroller
to effectively configure the device for its intended
measurement.
On-board 8KB user flash allows the MAX35101 to be
nonvolatile-configurable and provide nonvolatile energy
use data to be logged. Configuration can be recalled anytime
with a SPI command.
Applications
- Ultrasonic Gas Meters
- Ultrasonic Heat Meters
- Ultrasonic Water Meters
