3.1 CFG0 (Measurement Period)

Table 3-2. Definitions
Response time

The time between physical contact until touch reporting on OUTx
Measurement time Total time required to acquire (including oversampling) and post process touch signals for one sensor
Sleep time The time the device sleeps between measurements
Measurement period (cycle time)

The time between the start of one measurement and the start of the following measurement, including:

  • Measurement time
  • Sleep time

This time is selected via CFG0.
Number of sensors

There are three sensors for MTCH1030:

  • MTCH1030 has the option to disable up to five buttons
  • Depending on the number of sensors enabled, this parameter will change
Number of sensors touched MTCH1030 allows the user to simultaneously touch multiple buttons. Depending on the number of simultaneously touched sensors, the response time will vary as the number of sensors simultaneously touched will be measured during confirmation scanning.
CFG0 selects a measurement period of up to 250 milliseconds (ms) for the target application. Touch measurements are performed periodically based on the measurement period. Once completing the measurement, the CPU goes into Sleep mode. This control allows the application designer to balance touch responsiveness against power consumption. Increasing the measurement period increases the response time and reduces power consumption as the device spends more time in Sleep mode. Reducing the measurement period provides a faster indication of touch contact.
Note: Configuration input is in non-ascending order. Settings expected in low-power applications are tied directly to VDD or GND as this removes the necessity for a resistive divider bridge and associated bias current.

Select the longest measurement period at CFG option A (250 ms) or option D (100 ms) to achieve the low-power configurations.

Table 3-3. 
Configuration Measurement Period (ms)
A 250
B Minimum (back-to-back)
C 50
D 100