User Guide

ManualsBrandsNokia ManualsCell PhoneE90

141

142

143

144

145

146

147

148

149

150

The application section includes an application processor ASIC with DDR/NAND combo memory as the core.

Application processor

The application processor is also called an application ASIC because it is processing application SW and

handles the UI SW. It consists of the application processor and peripheral subsystems such as camera, display

and keyboard driver blocks.

In addition to interfaces mentioned above, the peripherals block includes several different I/O interfaces, for

example, for keyboard, modem chip, audio, Bluetooth and so on.

Absolute maximum ratings

Signal Min Nom Max

Uni

Notes

Battery voltage (idle) -0.3 +4.5 V Battery voltage maximum value is

specified during charging is active

Battery voltage (Call) +3.2 +4.3 V Battery voltage maximum value is

specified during charging is active

Charger input voltage -0.3 +20 V

Back-Up supply voltage 0 2.5 2.6 V Maximum capacity of the backup

power supply assumed to be 10 µAh.

Phone modes of operation

Mode Description

NO_SUPPLY (dead) mode means that the main battery is not present or its voltage is too low (below

EM ASIC N2200 master reset threshold) and that the back-up battery voltage is too low.

BACK_UP The main battery is not present or its voltage is too low but back-up battery voltage is

adequate and the 32kHz oscillator is running (RTC is on).

PWR_OFF In this mode (warm), the main battery is present and its voltage is over EM ASIC 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 32kHz clock to count the REST mode delay

(typically 16ms).

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

activity is low.

FLASHING FLASHING mode is for SW downloading.

Voltage limits

Parameter Description Value

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

VMSTR+ Threshold for charging, rising (N2300) 2.1V (typ.)

RA-6

System Module

Page 6 –6 COMPANY CONFIDENTIAL Issue 1