Battery Disconnected; Battery Disconnected When Charger Is Connected; Sleep Mode; Entering The Sleep Mode - Nokia NSW-6 Series Technical Documentation Manual

NSW-6
System Module SE2

Battery Disconnected

When battery is disconnected, immediate and totally uncontrolled power–
down happens. Therefore a power off procedure in this case can not be
described. One possible risk is that if the MCU is writing something to
Flash exactly at the same moment, the memory contents may be cor-
rupted.

Battery Disconnected when charger is connected

From hardware point of view the phone could otherwise continue func-
tioning normally, but if the charger voltage is higher than the maximum
allowed battery voltage, this can damage the RF parts. Therefore, there
must be hardware protection against this in CHAPS.
If the user presses the PWR–key, the phone can wake up to detect that
the battery is not present (no BTYPE and /or BTEMP). After that the
phone either turns off or goes to low current mode (can be decided by
MCU SW).
This state does not harm the phone. The phone can not be used only
from the charger without the battery.

Sleep Mode

Entering the Sleep mode

The phone can enter SLEEP only when both MCU and DSP request it. A
substantial amount of current is saved in SLEEP. When going to SLEEP
following things will happen
1
2
3
4
5

Waking up from the Sleep mode

In the typical case phone leaves the SLEEP–mode when the SLEEP–
counter in MAD expires. After that MAD enables VR1
ning after a pre–programmed delay RFCSETTLED rises => MAD re-
ceives COBBACLK clock
There are also many other cases when the SLEEP mode can be inter-
rupted, in these cases MAD enables the VR1 and operation is started
similarly
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Both MCU and DSP enable sleep mode, set the sleep timer
and enter sleep mode (MCU: HW DEEP SLEEP, DSP: IDLE3;
both the core, peripherals and PLL stop)
RFCEN and RFCSETTLED –> 0 –> COBBACLK will stop
(gated in COBBA). Also VR1 is disabled –> VCXO supply volt-
age is cut off –> RFC stops.
LCD display remains the same, no changes
Sleep clock (SLCLK) and watchdog in CCONT running
Sleep counter in MAD running, uses SLCLK
MAD operation re–starts.
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