User Guide

PAMS
System Module DB6
NHB–3
Technical Documentation
Original 26/97
Page 4–21
JCONN is used to indicate that junction box is connected. DC level
comes from system connector line MIC_JCONN. Phone can also. .
enter minimum mode when M2BUS is connected to MIC_JCONN
line. Line is connected to MCU A/D–input.
Main Components
Hitachi H8/536:
H8/536 is a CMOS microcontroller unit (MCU) comprising a CPU
core and on–chip supporting modules with 16–bit architecture. The
data bus to outside world has 8 bits.
1024k*8bit FLASH memory:
150 ns. maximum read access time (MCU need 1 wait state)
contains the main program code for the MCU; part of the DSP pro-
gram code is also located on FLASH
ASIC can address two 4Mbit memories or one 8Mbit memory.
32k*8bit SRAM memory:
100 ns. maximum read access time
8k*8bit paraller EEPROM memory:
150 ns. maximum read access time
contains user defined information
there is a register bit on the ASIC which must be set before the write
operation to the EEPROM.
PWRU
Introduction
The power block creates the supply voltages for the baseband block and con-
tains the charging electronics.
External Signals and Connections, Inputs
Signal name Signal description From
XPWRON PWR on switch UIF
XPWROFF Power off control CTRLU
VBATT Battery voltage system conn.
PWM Charger on/off control CTRLU
VCHAR Charging voltage system conn.
VOLTLIM Software charger voltage limit CTRLU