Nokia NSE-6 SERIES Service Manual

Also see for NSE-6 SERIES: Technical documentation Tuning Instructions Disassembly & troubleshooting instructions

Contents

Nokia NSE-6 SERIES Service Manual Manual pdf 39 page image

PAMSTechnical DocumentationNSE–6System ModulePage 3 – 27Original 08/98The battery voltage, temperature, size and current are measured by theCCONT controlled by the charging software running in the MAD.The power management circuitry controls the charging current deliveredfrom the charger to the battery. Charging is controlled with a PWM input sig-nal, generated by the CCONT. The PWM pulse width is controlled by theMAD and sent to the CCONT through a serial data bus. The battery voltagerise is limited by turning the CHAPS switch off when the battery voltage hasreached 4.2V (LiIon) or 5.2V (NiMH, 5V in call mode). Charging current ismonitored by measuring the voltage drop across a 220mohm resistor.Power OffThe baseband is powered down by:1. Pressing the power key, that is monitored by the MAD via key-board line (row 4), which starts the power down procedure.2. If the battery voltage is dropped below the operation limit, ei-ther by not charging it or by removing the battery.3. Letting the CCONT watchdog expire, which switches off allCCONT regulators and the phone is powered down.4. Setting the real time clock to power off the phone by a timer.The RTC generates an interrupt signal, when the alarm is goneoff. The RTC interrupt signal is connected to the PWRONX lineto give a power off signal to the CCONT just like the power key.The power down is controlled by the MAD. When the power key has beenpressed long enough or the battery voltage is dropped below the limit theMCU initiates a power down procedure and disconnects the SIM power.Then the MCU outputs a system reset signal and resets the DSP. If there isno charger connected the MCU writes a short delay to CCONT watchdogand resets itself. After the set delay the CCONT watchdog expires, whichactivates the PURX and all regulators are switched off and the phone ispowered down by the CCONT.If a charger is connected when the power key is pressed the phone en-ters into the acting dead mode.WatchdogThe Watchdog block inside CCONT contains a watchdog counter andsome additional logic which are used for controlling the power on andpower off procedures of CCONT. Watchdog output is disabled whenWDDisX pin is tied low. The WD-counter runs during that time, though.Watchdog counter is reset internally to 32s at power up. Normally it is re-set by MAD writing a control word to the WDReg. Watchdog counter canbe disabled b grounding J111.