User Manual
LRB-1 Nokia Bluetooth Tranceiver Component
- Preliminary Information -
April 2001 Confidential 7/11
C. Hardware Interfaces for Control
In order to allow a system integration approach of the LRB-1 Bluetooth Transceiver Component into
different customer applications without any overhead for interface logic, the control interface section of
the module has been designed with special regard to flexibility. Three different digital control interfaces
plus an embedded Analog-to-Digital converter can be used:
q I
2
C Interface:
To allow easy interfacing to possible system extensions (e.g. by the use of port expanders) the LRB-1
features a 2-wire I
2
C bus master realized in HW supporting both standard and fast mode with bit
rates of up to 1.3 MBit/s. Addressing can be either 7 bit or 10 bit.
q MicroWire Interface:
A standard 4-wire industry-standard serial bus has been is available to support one external Micro-
Wire slave (e.g. audio codec, EEPROM) with programmable word length of 1..32 bit. The clock fre-
quency is fixed to 500 kHz, the polarity of the corresponding chip select signal can be programmed.
q
Programmable General-Purpose Ports (GPPs):
Up to 12 user-programmable general purpose ports can be flexibly used for other application-specific
hardware interfaces. Each port can be independantly programmed for input, output or bi-directional
data transmission, generating an interrupt and uses switchable pull-ups/pull-downs.
In order to limit the total number of pins the functionality of the GPPs is multiplexed with that of
other control and data interfaces according to the following table. Using an external application
voltage of 1.8 – 3.3 V the voltage level of the module pins can be adjusted to customer needs.
q Analog-to-Digital Converter:
One input of the embedded ADC with a resolution of 10 bit is available for application purposes.