Battery Interface; Camera Interface - Nokia RM-42 Service Manual

RM-42
System Module
The detection of RS MMC card removal/insertion is done via RS MMC cover switch. Removing RS MMC while writing
to RS MMC may corrupt data in RS MMC. RS MMC cover switch gives an interrupt to the SW while the cover is
opened or closed. After RS MMC cover lid opening (RS MMC SW signal is connected to GND via cover switch) the
SW power down the RS MMC card and switches off the RS MMC power supply (VSIM2). When the RS MMC cover
lid is closed (RS MMC SW signal is internally connected in Helen3 to 1.8V) the card should be identified if card
exists.
See Also
• RS MMC interface connections (Page 9–35)

Battery interface

The battery interface supports NMP Lynx battery interface for the BL-5B battery. This interface consists of three
connectors: VBAT, BSI and GND. BSI line is used to recognize battery capacity by a battery internal pull down
resistor.
Battery temperature is estimated by measuring separate battery temperature NTC via BTEMP line, which is
located on the transceiver PWB, in a place where phone temperature is most stabile.
For service purposes the device SW can be forced into local mode by using pull down resistors connected to the
BSI line.
See Also
• Battery connector and interface connections & electrical characteristics (Page 9–36)

Camera interface

The device uses a Unagi camera module and separate camera DSP. Unagi is a 2Mpixel camera with Auto focusing
feature. AF mechanics are moved by SIDM through four PWM controlled wires from camera DSP. Sensor
resolution of Unagi camera is 1600 x 1200. Unagi camera is placed to the moving camera head with Flash LED.
Camera DSP is placed to engine board. The following figure shows the block diagram where two CCP bus are
used to transfer image data from Unagi camera to camera DSP and from camera DSP to engine. Control interfaces
for camera system are two bi-directional I2C busses, where I2C1 is an SW implemented interface. Unagi camera
is connected to engine by 24 micro coaxial cables through hinge.
Two camera regulators N1470 and N1471 powers the camera system. Vcam1V5 power core parts of sensor and
camera DSP. Vcam2V8 is for interfaces of camera and camera DSP. Both regulators have their own enable signals.
When both of these signals are turned on High Level, the camera system enters the operation mode. When both
eneble signals are turned on Low Level, the camera system enters the power off mode. Extclk signal feeds system
clock for camera module and camera DSP. Flash LED strobe signal from camera DSP is used to trigger flash LED
for still imaging..
9241872 (Issue 1)
Figure 105 Battery pin order
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