Nokia 5140 Manuales De Servicio
NPL-4/5
System Module and User Interface
Nokia Customer Care
Page 34
Copyright © 2004 Nokia Corporation. All rights reserved.
Issue 1 05/04
UEMEK internal watchdog is running during the UEMEK reset state, with the longest
watchdog time selected. If the watchdog expires, the UEMEK returns to power off state.
The UEMEK watchdog is internally acknowledged at the rising edge of the PURX signal in
order to always give the same watchdog response time to the MCU.
watchdog time selected. If the watchdog expires, the UEMEK returns to power off state.
The UEMEK watchdog is internally acknowledged at the rising edge of the PURX signal in
order to always give the same watchdog response time to the MCU.
Power up with PWR key
When the Power on key is pressed the UEMEK enters the power up sequence. Pressing
the power keycauses the PWRONX pin on the UEMEK to be grounded. The UEMEK
PWRONX signal is not part of the keypad matrix. The power key is only connected to the
UEMEK. This means that when pressing the power key an interrupt is generated to the
UPP that starts the MCU. The MCU then reads the UEMEK interrupt register and notice
that it is a PWRONX interrupt. The MCU now reads the status of the PWRONX signal
using the UEMEK control bus, CBUS. If the PWRONX signal stays low for a certain time
the MCU accepts this as a valid power on state and continues with the SW initialization
of the baseband. If the power on key does not indicate a valid power on situation, the
MCU powers off the baseband.
the power keycauses the PWRONX pin on the UEMEK to be grounded. The UEMEK
PWRONX signal is not part of the keypad matrix. The power key is only connected to the
UEMEK. This means that when pressing the power key an interrupt is generated to the
UPP that starts the MCU. The MCU then reads the UEMEK interrupt register and notice
that it is a PWRONX interrupt. The MCU now reads the status of the PWRONX signal
using the UEMEK control bus, CBUS. If the PWRONX signal stays low for a certain time
the MCU accepts this as a valid power on state and continues with the SW initialization
of the baseband. If the power on key does not indicate a valid power on situation, the
MCU powers off the baseband.
Power up when charger is connected
In order to be able to detect and start charging in a case where the main battery is fully
discharged (empty) and hence UEMEK has no supply (NO_SUPPLY or BACKUP mode of
UEMEK) charging is controlled by START-UP CHARGING circuitry.
discharged (empty) and hence UEMEK has no supply (NO_SUPPLY or BACKUP mode of
UEMEK) charging is controlled by START-UP CHARGING circuitry.
Whenever VBAT level is detected to be below master reset threshold (VMSTR-) charging
is controlled by START_UP charge circuitry. Connecting a charger forces VCHAR input to
rise above charger detection threshold, VCHDET+. By detection start-up charging is
started. UEMEK generates 100mA constant output current from the connected charger’s
output voltage. As battery charges its voltage rises, and when VBAT voltage level higher
than master reset threshold limit (VMSTR+) is detected START_UP charge is terminated.
is controlled by START_UP charge circuitry. Connecting a charger forces VCHAR input to
rise above charger detection threshold, VCHDET+. By detection start-up charging is
started. UEMEK generates 100mA constant output current from the connected charger’s
output voltage. As battery charges its voltage rises, and when VBAT voltage level higher
than master reset threshold limit (VMSTR+) is detected START_UP charge is terminated.
Monitoring the VBAT voltage level is done by charge control block (CHACON). MSTRX=‘1’
output reset signal (internal to UEMEK) is given to UEMEK’s RESET block when
VBAT>VMSTR+ and UEMEK enters into reset sequence.
output reset signal (internal to UEMEK) is given to UEMEK’s RESET block when
VBAT>VMSTR+ and UEMEK enters into reset sequence.
If VBAT is detected to fall below VMSTR- during start-up charging, charging is cancelled.
It will restart if new rising edge on VCHAR input is detected (VCHAR rising above VCH-
DET+).
It will restart if new rising edge on VCHAR input is detected (VCHAR rising above VCH-
DET+).
Battery
NPL-4/5 uses BL-5B 760 mAh Lithium Polymer battery pack. The battery size is
5.7x34x46mm. Other battery packs aren’t supported.
5.7x34x46mm. Other battery packs aren’t supported.