User Manual

pg. 14

The frame synchronization output (Frame Sync, Figure 4) goes high each time a new measurement is

available. This can be used to synchronize the I

C communications channel to the capacitance

sensor.

Alternatively, the sensor might be polled as quickly as possible over I

C. Since the frame index

increments with each frame it can be used to identify duplicate or missing data readings.

2.6 Product Categories

Standard sensors will perform typically to their specified force range.

The separately available, generic electronics interface from PPS is suitable for use with the Standard

sensors. With a standard sensor fitted and loaded to its specified maximum force (e.g. 45N for a 45N

sensor) the scaling factor may be configured via the I

C bus to generate an I

C sensor value equal to

511 and equivalent analog output of 1.5V to ensure the sensor is operating within its valid range.

Calibrated sensors offer improved accuracy and linearity over the Standard sensors and come as a

matched sensor plus electronics interface board providing a pre-configured, calibrated linear output

for the specified sensor range, e.g. for an input force of 0 to 10N a 10N calibrated sensor will output a

linear I

C range of 0 to 511 and equivalent analog output of 0.5V to 1.5V.

To maintain calibration, calibrated electronics + sensor combinations as shipped should be

maintained as matched pairs.

To implement multiple sensor solutions multiple sensor interface boards can be connected to a single

C bus as described in the I2C Interface section.