The LMP92064 is a precision low-side digital current sensor and voltage monitor with a
digital SPI interface. This analog frontend (AFE) includes a precision current sense amplifier to
measure a load current across a shunt resistor and a buffered voltage channel to measure the
voltage supply of the load. The current and voltage channels are sampled simultaneously by
independent 125-kSps, 12-bit ADC converters, allowing for very accurate power calculations in
unidirectional sensing applications.
The LMP92064 includes an internal 2.048-V reference for the ADCs, eliminating the need of
an external reference and reducing component count and board space.
A host can communicate with the LMP92064 using a four-wire SPI interface running at
speeds of up to
20 MHz. The fast SPI interface lets the user take advantage of the higher bandwidth ADC to
capture fast varying signals. The four-wire interface with dedicated unidirectional input and
output lines also allows for an easy interface to digital isolators in applications where isolation
The LMP92064 operates from a single 4.5-V to 5.5-V supply and includes a separate digital
supply pin. The LMP92064 is specified over a temperature range of 40°C to 105°C, and is available
in a 5-mm × 4-mm 16-Pin WSON package.
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