• Up to 2 full- or 4 halfbridges
  
• Up to 2 Wheatstone bridges
• Capable of driving only a halfbridge without any loss in precision
  
• For compensated or non-compensated bridges
  
• Adaptation of compensation resistor's Tk by software
  
• Offset and span compensation internally separated (mathematically), therefore no need to trim the bridge offset
  
• Resistance strain gauge: 350 Ohm to 10 kOhm
  
• Programmable resolution: Up to 19 Bit (20nV rms or 500,000 scale div) @ 2 mV/V strain and 5 Hz update rate
  
• High Measurement rate: Up to 50 kHz with high resolution (12.4 ENOB @ 4 kHz and 2 mV/V max. strain)
  
• Extremely low current consumption possible: Down to
  15 µA (incl. SG) at 1 Hz and 10 ENOB with 1 kOhm SG and 1000 µ strain
  
• High stability with temperature, low gain error (< 1 ppm/K)
  
• No need for a pre-amplifier
  
• No separate supply of SG
  
• No separate reference voltage
  
• Optional Single-conversion mode
  
• Separate temperature measurement
  
• Optional capacity measurement
  
• Serial interface (SPI compatible)
  
• Supply voltage I/O and SG: 1.8 ... 5.5 V
  
• Separate Supply for interface I/Os
  
• Supply voltage PSØ21: 1.8 ... 3.6 V
  
• Op. temperature range -40°C ... +120°C
  
• QFN48 / QFP48 package (body size 7 x 7 mm²)
  

• Features
• Schematic Diagram
• Connecting the Bridge
• Capacitor Choice
• Comparator
• Oscillator
• Cycle Time
• Averaging/Resolution
• Rdson/Gain Compensation
• Gain & Offset Drift
• Temperature Measurment
• Span & Offset compens.

Download datasheet as Acrobat PDF:
/
(~870 KB, May 2005)

Applications:

• Meatl strain gages
• Scales and load cells
  
• Force sensors
  
• Pressure sensors (also 4 - 20 mA)
  
• SG-amplifiers in general
  
• Solar cell driven devices
  
• Battery driven devices