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1:Power switch pressed ==> Digital voltages on in CCONT (VBB) 2: CCONT digital reset released. VCXO turned on 3: 62 ms delay to see if power switch is still pressed.

1:Power switch pressed ==> Digital voltages on in CCONT (VBB) 2: CCONT digital reset released. VCXO turned on 3: 62 ms delay to see if power switch is still pressed.

Technical Documentation System Module

Power Up by RTC

RTC ( internal in CCONT) can power the phone up by changing RTCPwr to logical "1". RTCPwr is an internal signal from the CCONT digital section.

Power Up by IBI

IBI can power CCONT up by sending a short pulse to logical "1". RTCPwr is an internal signal from the CCONT digital section.

Acting Dead

If the phone is off when the charger is connected, the phone is powered on but enters a state called "acting dead". To the user the phone acts as if it was switched off. A battery charging alert is given and/or a battery charging indication on the display is shown to acknowledge the user that the battery is being charged.

Active Mode

In the active mode the phone is in normal operation, scanning for channels, listening to a base station, transmitting and processing information. All the CCONT regulators are operating. There are several substates in the active mode depending on if the phone is in burst reception, burst transmission, if DSP is working etc..

Sleep Mode

In the sleep mode, all the regulators except the baseband VBB, VCOBBA, and the SIM card VSIM regulators are off. Sleep mode is activated by the MAD after MCU and DSP clocks have been switched off. The voltage regulators for the RF section are switched off and the VCXO power control, VCXOPwr is set low. In this state only the 32 kHz sleep clock oscillator in CCONT is running. The flash memory power down input is connected to the ExtSysResetX signal, and the flash is deep powered down during the sleep mode.

The sleep mode is exited either by the expiration of a sleep clock counter in the MAD or by some external interrupt, generated by a charger connection, key press, headset connection etc. The MAD starts the wake up sequence and sets the VCXOPwr and ExtSysResetX control high. After VCXO settling time other regulators and clocks are enabled for active mode.

If the battery pack is disconnect during the sleep mode, the CCONT pulls the SIM interface lines low as there is no time to wake up the MCU.


Charging can be performed in any operating mode. The charging algorithm is dependent on the used battery technology. The battery type is in-

System Module Technical Documentation dicated by a resistor inside the battery pack. The resistor value corresponds to a specific battery capacity. This capacity value is related to the battery technology as different capacity values are achieved by using different battery technology.

The battery voltage, temperature, size and current are measured by the CCONT controlled by the charging software running in the MAD.

The power management circuitry controls the charging current delivered from the charger to the battery. Charging is controlled with a PWM input signal, generated by the CCONT. The PWM pulse width is controlled by the MAD and sent to the CCONT through a serial data bus. The battery voltage rise is limited by turning the CHAPS switch off when the battery voltage has reached 4.2V (Lilon) or 5.2V (NiMH, 5V in call mode). Charging current is monitored by measuring the voltage drop across a 220mohm resistor.

Power Off

The baseband is powered down by:

1. Pressing the power key, that is monitored by the MAD, which starts the power down procedure.

2. If the battery voltage is dropped below the operation limit, either by not charging it or by removing the battery.

3. Letting the CCONT watchdog expire, which switches off all CCONT 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 gone off. The RTC interrupt signal is connected to the PWRONX line to 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 been pressed long enough or the battery voltage is dropped below the limit the MCU initiates a power down procedure and disconnects the SIM power. Then the MCU outputs a system reset signal and resets the DSP. If there is no charger connected the MCU writes a short delay to CCONT watchdog and resets itself. After the set delay the CCONT watchdog expires, which activates the PURX and all regulators are switched off and the phone is powered down by the CCONT.

If a charger is connected when the power key is pressed the phone enters into the acting dead mode.


The Watchdog block inside CCONT contains a watchdog counter and some additional logic which are used for controlling the power on and power off procedures of CCONT. Watchdog output is disabled when WDDisX 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 reset by MAD writing a control word to the WDReg.

Technical Documentation System Module

Audio control

The audio control and processing is taken care by the COBBA-GJ, which contains the audio and RF codecs, and the MAD2, which contains the MCU, ASIC and DSP blocks handling and processing the audio signals. A detailed audio specification can be found from document

The baseband supports three microphone inputs and two earphone outputs. The inputs can be taken from an internal microphone, a headset microphone or from an external microphone signal source. The microphone signals from different sources are connected to separate inputs at the COBBA-GJ asic. Inputs for the microphone signals are differential type.

The MIC1 inputs are used for a headset microphone that can be connected directly to the system connector. The internal microphone is connected to MIC2 inputs and an external pre-amplified microphone (handset/handfree) signal is connected to the MIC3 inputs. In COBBA there are also three audio signal outputs of which dual ended EAR lines are used for internal earpiece and HF line for accessory audio output. The third audio output AUXOUT is used only for bias supply to the headset microphone. As a difference to DCT2 generation the SGND ( = HFCM at COBBA) does not supply audio signal (only common mode). Therefore there are no electrical loopback echo from downlink to uplink.

The output for the internal earphone is a dual ended type output capable of driving a dynamic type speaker. The output for the external accessory and the headset is single ended with a dedicated signal ground SGND. Input and output signal source selection and gain control is performed inside the COBBA-GJ asic according to control messages from the MAD2. Keypad tones, DTMF, and other audio tones are generated and encoded by the MAD2 and transmitted to the COBBA-GJ for decoding.

System Module

Technical Documentation

External Audio Connections

The external audio connections are presented in figure 16. A headset can be connected directly to the system connector. The headset microphone bias is supplied from COBBA AUXOUT output and fed to microphone through XMIC line. The 330ohm resistor from SGND line to AGND provides a return path for the bias current.



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