AN3299

Hardware

Doc ID 18113 Rev 1

5/13

1.1.2

Reset pin recommendation

The following is a few examples of configurations at the reset pin.

●

If a reset delay is desired (recommended) upon power up, an RC delay can be

connected to the reset as shown below.

Figure 2.

RSTB connectivity recommendation 1

●

If external reset assertion is required through CPU/baseband, RSTB can be connected

to the GPIO. The diagram below shows the presence of a weak pull-up resistor

assuming CPU/baseband control is open drain. The minimum pulse width of the

external reset signal is 100 µs.

Figure 3.

RSTB connectivity recommendation 2

●

If reset delay and external reset assertion, as shown in case1 and case2 above, are not

required, it is recommended to short the reset pin to VCC through a low resistor of 0.1

Ω - 100 Ω.

AM08426v1

Reset

VCC

1.65 V – 3.6 V

STMPE801

CPU control

10 k

VCC

CPU control

Ω