Data Sheet

Bluegiga Technologies Oy
Page 23 of 52
3.1 PSWITCH_OUT pin 14
Note: In most cases the user can ignore the PSWITCH pin. Leave unconnected for normal operation.
The ÅSWITCH_OUT (pin 14) has three levels: low, mid and high. A 10kΩ pull-up to mid-level is applied on the
module to the PSWITCH line, causing the device to start booting immediately once power is applied. Boot-up
requires a mid-level voltage to be present for >100ms.
If the PSWITCH is pulled high for over 5 seconds, for example by connecting it to 3.3V, a special Freescale
USB recovery mode is entered. For further details about the power switch, refer to Freescale’s Reference
Manual, Section 11.4. This mode can also be entered using the BOOTMODE pin.
3.2 RESETN
Power-on reset is generated internally. If a reset from external pins is required use the RESETN pin. RESETN
is internally pulled up to 3.3V.
The RESETN pin must be kept low for at least 100ms and then released in order to guarantee a proper reset.
Figure 3: NRESET
100ms
NRESET