PS02 does not need a full-bridge. Two resistors, below called half-bridge, are sufficient. Together with a capacitor these two resistors form a low-pass filter. The capacitor is loaded to Vio and then alternately discharged through the resistors.

PSØ2 offers two sets of ports, one for each half-bridge. Each block is made of 6 pins, where each SG element is connected via 2 pins to PSØ2.

• Features
• Schematic Diagram
• Connecting the Bridge
• Capacitor Choice
• Comparator
• Oscillator
• Cycle Time
• Averaging/Resolution
• Rdson Compensation
• Gain Compensation
• Temperature Measurment
• Capacitor Measurement

Both half-bridges will be measured in an interleaved manner, called ‚Alternating mode’. An advantage of the Alternating mode is the redundancy or tolerance against failures. If one half-bridge fails, the other half-bridge is still fully operating. By the measuring principle only one comparator is necessary. For those applications that do not need 2 comparators we recommend the use of only one. This mode is called „One-Sense“ mode.

The full-bridge mode is the one with intrinsically the lowest temperature drift of the electronics. Connecting the two half-bridges in a way the results will be subtracted reduces drastically the temperature drift down to the range of 5nV/K. This value is up to 30 – 50 times lower than the one of a good strain gage. In the tem-perature drift mentioned the comparator circuit is already included.