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User Manual
Airbridge cBTS3612 CDMA Base Station
BHPA
External
temperature
collection
Figure 2-22 Structure of BBFM module
MCU module
l
The MCU module collects and analyzes the temperature information to generate
PWM signal for controlling the fan speed, receives alarm signals generated by
BHPA module and fan alarm signals and reports to BTRM module, generates panel
indicator signal and communicates with BTRM module.
BHPA interface module
l
This moduloe isolates and drives the interface with BHPA.
Temperature information collection module
l
This module collects the temperature information of BHPA module in real time,
which is implemented by MCU in query operation.
Panel indicator driving and alarm signal isolation module
l
It is used to drive the panel indicator and isolate fan alarm signals.
Communication module
l
The module performs serial communication with BTRM module.
Power supply module
l
The input power of BFMM is +27V, power consumption is 3.5W (including power for
the fans ).
3) Interface
BHPA interface
l
Interface with BHPA module, used for BHPA alarm monitoring.
Serial communication interface
l
Interface used to report the alarm of the fans and BHPA module.
BBFM
HPAU
Interface
circuit
Temperature
collection
Watchdog
2-41
Panel indicator
driving alarm
signal isolation
circuit
PWM
Modulation
MCU
circuit
Communication
interface
System Description
2 Hardware Architecture
Fan cover
Serial port
BTRM
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