PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 60

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

Preliminary
• In Sleep/Power Down mode (PDRx) a similar mechanism is used. In this mode, the
– In Sleep mode, the analog information is fed to an analog comparator integrated in the
– In Power Down mode, the SLICOFI-2x converts the analog information to a digital
In applications using ground start signaling, DuSLIC can be set in the ground start mode.
In this mode, the Tip wire is switched to high impedance mode. Ring ground detection is
performed by the internal current sensor in the SLIC and transferred to the SLICOFI-2x
via the IT pin.
Ground Key Detection
The scaled longitudinal current information is transferred from the SLIC via the IL pin and
the external resistor
value. For the specified
threshold corresponds to 17 mA (positive and negative). After further post-processing,
this information generates an interrupt (GNDK bit in the INTREG1 register) and ground
key detection is indicated.
The polarity of the longitudinal current is indicated by the GNKP bit in the INTREG1
register. Each change of the GNKP bit generates an interrupt. Both bits (GNDK, GNKP)
can be masked in the MASK register.
The post-processing is performed to guarantee ground key detection, even if longitudinal
AC currents with frequencies of 16
between triggering the ground key function and registering the ground key interrupt will
in most cases (
For longitudinal DC signals, the blocking period can be programmed by the DUP value
in register IOCTL3. DC signals with less duration will not be detected. The DUP time is
equivalent to the half of the cycle time for the lowest frequency for AC suppression (for
values see
In Power Down mode, the SLIC’s internal current sensors are switched off and ground
key detection is disabled.
Data Sheet
internal current sensor of the SLIC is switched off to minimize power consumption.
The loop current is therefore fed and sensed through 5 k
SLIC (see
IT pin and interpreted by the SLICOFI-2x.
SLICOFI-2x who directly indicates off-hook.
value. It is then filtered and processed further which effectively suppresses line
disturbances. If the result exceeds a programmable threshold, an interrupt is
generated to indicate off-hook detection.
Page
Figure
f
= 50 Hz, 60 Hz) be less than 40 ms.
189).
R
9,
IL
Figure
to SLICOFI-2x. This voltage is compared with a fixed threshold
R
IL
(1.6 k , see application circuit
10,
Figure
2
/
3
, 50 or 60 Hz are superimposed. The time delay
11). The information is made available on the
60
Figure
resistors integrated in the
Functional Description
97,
Page
2000-07-14
DuSLIC
368) this