Absolute Maximum Ratings; Modes Of Operation - Nokia 6680 RM-36 Service Manual

Nokia Customer Care
Section
USB & modem interface
System components
Peripheral subsystem

Absolute maximum ratings

Signal
Battery voltage (idle)
Battery voltage (Call)
Charger input voltage
Back-Up supply voltage

Modes of operation

Mode Description
NO_SUPPLY (dead) mode means that the main battery is not present or its voltage is too low (below
RETU 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 RETU 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).
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Min Nom Max
-0.3
-0.3
0 2.5
Company Confidential
Copyright ©2005 Nokia. All Rights Reserved.
Description
These two modules enable the platform to support a
universal serial link and a dedicated modem
interface, enabling a high data transfer rate between
the modem and the application chip.
System components are group of modules
responsible for managing system interactions such
as interrupt, clock control and idle.
The peripheral subsystem defines all the
components used to interface OMAP1710 with
specific external devices such as camera, keyboard,
display, etc.
Unit Notes
+4.5 V Battery voltage maximum value is
specified during charging is active
+4.3 V Battery voltage maximum value is
specified during charging is active
+16V V
2.7 V Maximum capacity of the backup
power supply assumed to be 200
µAh.
RM-36
System Module
Issue 1