Power-On Reset (Por); External Reset (Xres); Brownout Detection - Infineon AIROC CYBLE-343072-02 Manual

AIROC™ Bluetooth® LE module
Functional description
• File system information used for code, code patches, or data. The CYW20835 uses SPI Serial Flash for NVRAM
storage.
6.2.4

Power-on reset (POR)

The CYW20835 includes POR logic to allow the part to initialize correctly when power is applied.
the sequence used by the CYW20835 during initialization. An small external cap may be used on RESET_N to add
delay as VDDIO ramps up.
6.3

External reset (XRES)

The CYBLE-3x307x-02 has an integrated power-on reset circuit that completely resets all circuits to a known
power-on state. An external active low reset signal, XRES, can be used to put the CYBLE-3x307x-02 in the reset
state. The XRES pin has an internal pull-up resistor and, in most applications, it does not require anything to be
connected to it.
Figure 10 Power-on reset timing
6.3.1

Brownout detection

An external voltage detector reset IC may be used if brownout detection is required. The reset IC should release
RESET_N only after the VDDO supply voltage level has been at or above a minimum operating voltage for 50 ms
or longer.
Preliminary Datasheet 23 of 58
Figure 10 shows
002-33419 Rev. **
2021-07-22