peb4266 Infineon Technologies Corporation, peb4266 Datasheet - Page 15

• Manufacturer Part Number: peb4266
• Description: Subscriber Line Interface Circuit Enhanced Power Management
• Manufacturer: Infineon Technologies Corporation

Table 3
SLIC-P Mode
HIRT
HIT
HIR
ROR
ROT
Power Down High Impedance (PDH)
PDH offers high impedance at TIP and RING; it can be used for testing purposes or when an error condition
occurs. In PDH mode all functions are switched off. Off-hook detection is not available.
Power Down Resistive (PDRH, PDRR)
Power consumption is reduced to a minimum by switching completely off all voice transmission functions. To allow
off-hook detection, Power Down Resistive provides a connection of 5 k
to either VBATH (PDRH) or VBATR (PDRR), while the output buffers show high impedance (see Figure 4). The
current through these resistors is sensed and transferred to the IT pin for off-hook supervision.
Power Down Resistive Load (PDRHL, PDRRL)
PDRHL (PDRRL) is used as a transition state when the operating mode is changed from PDRH (PDRR) to ACTH
(automatically initiated by the codec). It causes fast preloading of
Active Low (ACTL
These are the regular transmission modes for voiceband. The line-driving section is operated between
V
Active Ring (ACTR
This mode can be used for balanced ringing up to 85 V
with external ringing).
High Impedance (HIR, HIT, HIRT)
In these modes each of the line outputs can be programmed to show high impedance. HIT switches off the TIP
buffer, while HIR switches off the RING buffer. The current through the active buffer can still be measured by IT
or IL. In the HIRT mode both buffers show high impedance. The current sensor remains active thus allowing
sensor offset calibration (for test purposes).
Ring on Tip (ROT)
An unbalanced ring signal up to 50 V
Ring on Ring (ROR)
An unbalanced ring signal up to 50 V
Preliminary Data Sheet
BATH
and BGND. By means of pin C3, current limitations can be chosen to be either 90 mA or 60 mA.
SLIC-P Modes (cont’d)
90
90
, ACTL
Mode Description
High Impedance on RING and TIP
High Impedance on TIP (RING current limitation of 90 mA)
High Impedance on RING (TIP current limitation of 90 mA)
Ring on RING (current limitation 60 mA)
Ring on TIP (current limitation 60 mA)
, ACTR
60
60
), Active High (ACTH
)
rms
rms
can be fed to the Tip line. The Ring line is fixed to a potential near BGND.
can be fed to the Ring line. The Tip line is fixed to a potential near BGND.
90
, ACTH
15
rms
or as a third voice transmission mode (in applications
60
)
C
EXT
in order to suppress line voltage transients.
resistors from TIP to BGND and RING
Revision 5.0, 2006-10-09
Functional Description
Internal Battery
Supply Voltage
V
V
V
V
V
BATR
BATR
BATR
BATR
BATR
PEB 4266
SLIC-P
V
BATL
or