User Guide

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Mode Description

PWR_OFF In this mode (warm), the main battery is present and its voltage is over N2200 master

reset threshold. All regulators are disabled, PurX is on low state, the RTC is on and the

oscillator is on. PWR_OFF (cold) mode is almost the same as PWR_OFF (warm), but the

RTC and the oscillator are off.

RESET RESET mode is a synonym for start-up sequence. In this mode certain regulators are

enabled and after they and RFClk have stabilized, the system reset (PurX) is released

and PWR_ON mode entered. RESET mode uses 32 kHz clock to count the REST mode

delay (typically 16 ms).

SLEEP SLEEP mode is entered only from PWR_ON mode with the aid of SW when the system’s

activity is low. There are in principle three different sleep modes:

• Application processor sleep

• RAP sleep

• Application processor and RAP sleep (deep sleep)

FLASHING FLASHING mode is for SW downloading.

Voltage limits

Parameter Description Value

VMSTR Master reset threshold (N2200) 2.2V (typ.)

VMSTR+

Master reset threshold level, rising

(N2300) 2.1V (typ.)

VMSTR-

Master reset threshold level, falling

(N2300) 1.9V (typ.)

VCOFF+ Hardware cutoff (rising) 2.9V (typ.)

VCOFF- Hardware cutoff (falling) 2.6V (typ.)

SWCOFF SW cutoff limit ~3.2V

The master reset threshold controls the internal reset of N2200 / (N2300). If battery voltage is above VMSTR,

N2300’s charging control logic is alive. Also, RTC is active and supplied from the main battery. Above VMSTR,

N2300 allows the system to be powered on although this may not succeed due to voltage drops during start

up. SW can also consider battery voltage too low for operation and power down the system.

Power key

The system boots up when power key is pressed (adequate battery voltage, VBAT, present).

Power down can be initiated by pressing the power key again (the system is powered down with the aid of

SW). Power on key is connected to N2200 ASIC via PWRONX signal.

Power distribution

Power supply components:

• EM ASIC N2200

• EM ASIC N2300

• application processor VCORE SMPS

• BT

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