6.1 Reset

The Reset block combines all Reset sources. It controls the device system’s Reset signal (SYSRST). The following is a list of device Reset sources:
  • MCLR: Host Clear Reset pin
  • SWR: Software Reset available through GestIC Library Loader
  • Power-on Reset (POR)
  • Brown-out Reset (BOR)
  • Watchdog Timer Reset (WDTR)

A simplified block diagram of the Reset block is illustrated in the following figure.

A pull-up resistor of 10 kΩ must be connected at all times to the MCLR pin.

It is recommended to have a dedicated MXG3141 reset line and avoid to share the same one used for maXTouch /RESET. This separation is required to avoid interference between tuning tools (e.g.: maXTouch Studio and Aurea).
Note: GestIC 3D detection operation starts after Reset regardless of the MODE pin status. As a consequence, if a hand is placed on the sensor at start-up, this could result in false gesture detection when the hand is removed. The host system must take this into account.
Figure 6-2. System Reset Block Diagram

Timing Diagrams for POR and BOR are shown below:

Figure 6-3. Power-on Reset Timing
Note:
  1. The power-up period will be extended if the power-up sequence completes before the device exits from BOR (VDD < VDDMIN).
  2. Includes interval voltage regulator stabilization delay.
Figure 6-4. Brown-out Reset Timing
It is recommended to have a dedicated MXG3141 reset line and avoid to share the same one used for maXTouch /RESET. This separation is required to avoid interference between tuning tools (e.g.: maXTouch Studio and Aurea).
Note: GestIC 3D detection operation starts after Reset regardless of the MODE pin status. As a consequence, if a hand is placed on the sensor at start-up, this could result in false gesture detection when the hand is removed. The host system must take this into account.