Cnw

The baseband supports three microphone inputs and two earphone outputs. The inputs can be taken from an internal microphone, a headset microphone or PPH-1 microphones. The microphone signals from different sources are connected to separate inputs at the COBBA-GJP 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 HS HF connector. The internal microphone is connected to MIC2 inputs. In COBBA there...

Power Up and Power Down

Pressing the power key, that generates a PWRONX interrupt signal from the power key to the CCONT, which starts the power up procedure. 2. Connecting a charger to the phone. The CCONT recognizes the charger from the VCHAR voltage and starts the power up procedure. 3. A RTC interrupt. If the real time clock is set to alarm and the phone is switched off, 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 on...

Cobba Gjp

COBBA GJP ASIC provides an interface between the baseband and the RF-circuitry. COBBA performs analogue to digital conversion of the receive signal. For transmit path COBBA performs digital to analogue conversion of the transmit amplifier power control ramp and the in-phase and quadrature signals. A slow speed digital to analogue converter will provide automatic frequency control (AFC). COBBA is at any time connected to MAD asic with two interfaces, one for transferring TX and RX data between...

Testing

The MCU software enters a local mode at start-up if suitable resistors are connected to the BTEMP and BSI lines. NOTE Baseband doesn't wake up automatically when the battery voltage is connected. Power must be switched on by inserting a waking pulse BTEMP line or In the local mode the baseband can be controlled through MBUS or FBUS connections by a PC-locals software. Baseband internal connections are tested with selftests if possible. Parameters cannot be set accurate enough by design because...

Disassembly of NSB

Press the button on the side. Step 2. Slide the cover downwards and the cover will be released. Step 3. Lift the battery first from the lower end. Step 4. Remove the battery. Step 2. Push the slide edge outwards. NOTE Use only numbered side 2 to release the slide. Step 3. Lift the slide up simultaneously and the slide NOTE Pull out the whip antenna first. Step 1. To remove the antenna, push with the thin spike of SRT-3 (Battery Connector Extractor Tool) forward to release the snaps....

Baseband Testing

The MCU software enters a local mode at startup if a dummy battery is attached and the battery temperature value is high enough. This means that the fixed resistor on the BTEMP line must correspond to a temperature higher than +85 C. In the local mode the baseband can be controlled through MBUS or FBUS connections by a PC-locals software. Baseband internal connections are tested with self tests if possible. By connecting MAD2 pin ROW5 to ground, MAD2 pins are toggled as a daisy chain, which can...