Sensors & Transducer Magazine Award: 10 Top Sensors Products of 2008
ZMD21013 was selected by the Sensors & Transducer Magazine as one of the 10 top sensor products!

The ZMD21013 is the first member of ZMD’s MUlti-channel / MUlti-use Sensor Interface (MUSicTM) IC family focusing on sensor-controlled, battery-powered, microcontroller based mobile electronics products. In general, the IC amplifies and digitizes the respective voltage signals of the connected sensors.
The ZMD21013 can be flexibly adapted to almost any resistive sensor type. It is optimized for (resistive) bridge-typed sensors. The device incorporates a sophisticated analog-frontend, including a programmable gain amplifier, a 16bit Charge-Balance-ADC and a power-saving analog sampling architecture. The A/D-conversion’s resolution and time, input range and sensitivity as well as the measurement mode are programmable. The measurement values are provided as digital output at the serial SPI-standard interface.
With its high level of integration and smart power architecture, the ZMD21013 can dramatically reduce the average overall bill of materials and power consumption of an entire sensor interface system. The result is an average ultra-low power consumption of only 25-to-30 µWatts during normal operations and less than 1µW in idle mode. Beyond the common signal measurement mode, the ZMD21013 supports an additional temperature measurement mode and an auto-zero mode, which allows monitoring of, long-term stability drifts, and offsets for compensation and correction purposes.
Further features of the ZMD21013 are: an alternative RC-clock generator, a wide supply voltage range (2.2V … 5.5V) and an integrated 16x8bit EEPROM (permanent storage of configuration data).

• Programmable analog-to-digital conversion of amplifi ed 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 amplifi er with offset compensation and adaptive operational amplifi er 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

• 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 amplifi cation, and parameter handling – all in one IC
• High input amplifi cation allows use of wide range of highly sensitive resistive sensor elements

• 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