PXN20 Product Brief, Rev. 1

Features

Freescale Semiconductor

6

•

Temperature range –40° to 105 °C ambient temperature

•

Low power design

— Designed for dynamic power management of core and peripherals

— Software-controlled clock gating of peripherals

— Simple power domains to minimize leakage in low power modes

— Internal voltage regulator (VREG) enables operation with a single input voltage

— 3.3 V / 5 V supply (nominal)

— External Ballast control

•

ADC analog supply range 3.0 V – 5.5 V

•

Low voltage detect circuit implemented

•

Configurable pins

— Selectable pull-up, pull-down, or no pull on all GPIO pins

— Selectable open-drain pin

2.4.1

Low Power Operation

The PXN20 devices have one dynamic power mode and one static power mode:

•

Low-power modes use clock gating to halt the clock for all or part of the device

•

The lowest power mode also uses power gating to automatically turn off the power supply to parts

of the device to minimize leakage

•

Dynamic power mode: RUN

— RUN mode is the main operating mode where the entire device is powered and clocked and

where most processing activity is done

•

Static power mode: SLEEP

— SLEEP mode halts the clock to the entire device and turns off the power to the majority of the

chip in order to offer the lowest power consumption mode of the PXN20. In SLEEP mode the

contents of the cores, on-chip peripheral registers and part of the volatile memory are not held.

The device can be awakened from up to 32 I/O pins, a reset, or from an internal periodic

wake-up. It is also possible to enable the 16 MHz IRC, the 4–40 MHz XTAL, 128 kHz IRC and

the 32 kHz XTAL.

– SLEEP1 mode retains 32 KB of the on-chip RAM

– SLEEP2 mode retains the 64 KB of the on-chip RAM

– SLEEP3 mode retains 128 KB of the on-chip RAM

— Fast wake-up using the on-chip 16 MHz IRC allows rapid execution from RAM on exit from

low power modes

– In SLEEP mode, a 4 – 40 MHz XTAL can be enabled to continue to run

– In SLEEP mode, the 16 MHz IRC can be enabled to continue to run and may be selected to

clock the RTC and API

– In SLEEP mode, the 128 kHz IRC can be enabled to run and may be selected to clock the

RTC and API