ZMD21013 Datasheet, PDF (1/2 Pages) Zentrum Mikroelektronik Dresden AG – MUSic Low-Power Multi-Channel Sensor Interface Circuits

The Analog Mixed Signal Company
ZMD21013
MUSic Low-Power Multi-Channel
Sensor Interface Circuits
Brief Description
Benefits
The ZMD21013 is optimized for low-voltage and low-power
multiple resistive bridge sensor applications, such as battery-
operated consumer or industrial products. The ZMD21013
provides programmable amplification and analog-to-digital
conversion (ADC) of the sensor signal input with an optional
temperature measurement output. This standard product is
applicable to almost any one, two, or three dimensional detec-
tion devices.
• Extremely long battery life due to <100nA idle current
and 25 to 30µW average power consumption in operation
• Space optimized design with three bridge inputs, high-gain
amplification, and parameter handling – all in one IC
• High input amplification allows use of wide range of highly
sensitive resistive sensor elements
Features
The IC’s analog sampling architecture enables a significant re-
duction of average power consumption via switched measure-
ments. The applied sensor will only be switched on during the
sampling time, which leads to typical average power consump-
tion of 25 to 30 µW. This makes the ZMD21013 the interface
device of choice for low-power sensor-based applications.
By default, the sensor bridges operate in a voltage driven
mode. ADC resolution, sample rate, input range, sensitivity,
and measurement mode are programmable. In addition, the
IC supports an auto-zero mode, which allows monitoring tem-
perature, long-term stability drifts and offsets for compensa-
tion and correction purposes.
The ZMD21013 includes an on-chip clock generator and an
16x8 bit EEPROM to store non-volatile configuration data. An
SPI-standard digital interface allows flexible adaptability to the
respective external digital system components (e.g. microcon-
trollers).
Applications and Examples
• Acceleration measurement
• Compass functions
• Density measurement (differential pressure analysis)
• Altimeter and barometer (watches, mobile devices)
• Flow and velocity measurement
• Pressure measurement (fluids, gases)
• Temperature measurement
• Programmable analog-to-digital conversion
of amplified resistive sensor input signals
• Low-power (average 25µW), high-sensitivity,
multi-channel sensor interface IC
• 3-channel sensor-bridge input multiplexer
• Completely ratiometric systems
• Inherent temperature measurement mode
• Low-noise SC amplifier with offset compensation
and adaptive operational amplifier biasing
• Industrial and consumer temperature range
(-25°C to +85°C)
• Internal auto-zero mode
• Voltage-driven (switched or static) bridge mode
• On-chip EEPROM and RC oscillator
Interfaces
• Analog signal in: 3 channels, optimized
for sensor bridge inputs
• Digital signal out: flexible, full duplex,
high-throughput 3-wire SPI
• Optional external clock 28kHz to 36kHz
Physical Characteristics
• Power supply range: ……… 2.2V to 5.5V
• ADC-resolution: ………….. (10, 12, 14, 16)bit
• Input sensitivity: …………… ( 0.9, 1.8, 3.7, …)µV/V
• Standby (idle) current: ……. <100nA @ 85°C
• Power consumption: ……… 4.5 µW to 22.5µW @ 3V