pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 26

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

I: Input
O: Output (Push-Pull)
OD: Output (Open Drain)
1.6.1
LED Pin ACT
A LED can be connected to pin ACT to display four different states (off, slow flashing,
fast flashing, on). It displays the activation status of the U- and S-transceiver according
to
Table 3
Pin ACT
V
2Hz (1 : 1)* fast flashing
1Hz (3 : 1)* slow flashing 0
GND
Note: * denotes the duty cycle ’high’ : ’low’.
with:
U_Deactivated: ’Deactivated State’ as defined in
U_Activated: ’SBC Synchronizing’, ’Wait for Info U4H’, and ‘Transparent‘ as defined in
Chapter
S-Activated: ’Activated State’ as defined in
Note: Optionally, pin ACT can drive a second LED with inverse polarity (connect this
Test Modes
The test patterns on the S-interface (‘2 kHz Single Pulses‘, ‘96 kHz Continuous Pulses‘)
and on the U-interface (‘Data Through‘, ‘Send Single Pulses‘,) are invoked via C/I codes
(TM1, TM2, DT, SSP). Setting SRES.RES_U to ‘1‘ forces the U-transceiver into test
mode ‘Quiet Mode‘ (QM), i.e. the U-transceiver is hardware reset.
Data Sheet
DD
Table
additional LED to 3.3V only).
3. or it is programmable via two bits (LED1 and LED2 in register MODE2).
2.4.7.6.
Specific Pins and Test Modes
LED
OFF
ON
ACT States
U_Deactivated
0
1
0
12
Chapter
x
0
1
1
U_Activated
Chapter
2.5.5.2.
2.4.7.6.
S_Activated
x
x
0
1
PEF 81902
2001-11-12
Overview