PSB2186N-V11TR Infineon Technologies, PSB2186N-V11TR Datasheet - Page 60

• Manufacturer Part Number: PSB2186N-V11TR
• Description: IC ISDN SUBSCRIB ACCESS 44-PLCC
• Manufacturer: Infineon Technologies

Specifications of PSB2186N-V11TR

• Controller Type: Subscriber Access Controller (ISDN)
• Interface: 4-Wire SPI Serial
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 17mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Other names: PSB2186N-V11INTR; PSB2186N-V11TR

2.5
Watchdog and External Awake
In addition to the ISAC-S TE standard functions supporting the ISDN-basic access, the
ISAC-S TE contains optional functions, useful in various terminal configurations.
The terminal specific functions are enabled by setting bit TSF (STCR register) to "1". This has
two effects:
The EAW line is defined as an external awake input;
Second, the interrupts SAW and WOV (EXIR register) are enabled:
ADF1
The WTC1 and WTC2 bits have to be successively written in the following manner within
128 ms:
As a result the watchdog timer is reset and restarted. Otherwise a WOV is generated.
Deactivating the terminal specific functions is only possible with a hardware reset.
Having enabled the terminal specific functions via TSF=1, the user can make the ISAC-S TE
generate a reset signal by programming the Reset Source Select RSS bit (CIXR/CIX0
register), as follows:
0
– a falling edge on the EAW line (subscriber awake)
– a C/I code change (exchange awake)
A falling edge on the EAW line also forces the IDP1 line of the IOM interface to zero.
The consequence of this is that the IOM interface and the ISAC-S TE leaves the
power-down state.
A corresponding interrupt status (CISQ or SAW) is also generated.
1
(indicated by the WOV interrupt status).
Note that the watchdog timer is not running when the ISAC-S TE is in the power-down
state (IOM not clocked).
Note: Bit RSS has a significance only if terminal specific functions are activated (TSF=1).
Semiconductor Group
1.
2.
SAW (Subscriber Awake) generated by a falling edge on the EAW line
WOV (Watchdog timer OVerflow) generated by the watchdog timer. This occurs when the
processor fails to write two consecutive bit patterns in ADF1:
A reset signal is generated as a result of
A reset signal is generated as a result of the expiration of the watchdog timer
Terminal Specific Functions
Watchdog Timer Control 1, 0.
WTC1
WTC1
1
0
WTC2
WTC2
0
1
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Functional Description