Bluetooth; Usb; Sim Interface - Nokia RM-42 Service Manual

RM-42
System Module Nokia Customer Care
Figure 102 Clocking scheme

Bluetooth

Bluetooth provides a fully digital link for communication between a master unit and one or more slave units.
The system provides a radio link that offers a high degree of flexibility to support various applications and
product scenarios. Data and control interface for a low power RF module is provided. Data rate is regulated
between the master and the slave.
The device Bluetooth is based on TI's BRF6150 BT ASIC..
The UART1 interface handles the transfer of control and data information between Helen3 and the BT system
(BRF6150).
The PCM interface is used for audio data transfer between RAP3G and the BT system (BRF6150).

USB

USB (Universal Serial Bus) provides a wired connectivity between a USB host PC and peripheral devices.
USB is a differential serial bus for USB devices. USB controller (RAP3G) supports USB specification revision 2.0
with full speed USB (12 Mbps). The device is connected to the USB host through the Pop-Port™ connector. The
USB bus is hot plugged capable, which means that USB devices may be plugged in/out at any time.

SIM interface

The device has one SIM (Subscriber Identification Module) interface. SIM interface consists of internal interface
between RAP3G and Retu and an external interface between Retu and SIM contacts. SIM interface functionality
is located in RAP3G while Retu takes care of power up/down, card detection, ATR counting and level shifting.
For Retu external SIM IF connections, see SIM interface connections (Page 9–34).
Retu handles SIM card detection and the detection method is based on the BSI line. Due to location of the SIM
card removal of the battery causes quick power down of the SIM IF. The Retu SIM1 interface supports both the
1.8V and 3.0V SIM cards. SIM interface voltage is first 1.8V when the SIM card is inserted and if the card does not
response to the ATR (Answer To Reset) 3V interface voltage is used. The data communication between the card
and the phone is asynchronous half duplex and the clock supplied to cards is 1-5MHz, which is 3.2MHz by default
(in GSM system). The data baud rate is SIM card clock frequency divided by 372 (by default), 64, 32 or 16.
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