PSB4596 Siemens Semiconductor Group, PSB4596 Datasheet - Page 65

• Manufacturer Part Number: PSB4596
• Description: Analog Line Interface Solution ALIS
• Manufacturer: Siemens Semiconductor Group

9.7
Figure 25
9.8
Ring detection works in ALIS as a two step procedure.
In a first step, ALIS-A will detect any AC signal at TIP and RING with a peak value of
more than 18 V and will generate the Ring_detect signal. This signal can either generate
an interrupt or switch ALIS to ringing mode depending on the No_auto_ring bit in CR1
(see “CR1 Configuration Register 1 (Dialing)” on page 40). The current power mode can
Semiconductor Group
Operating Flowchart
Flow of Ring Sequence and Detection
Operating Mode Transitions and Interrupts
2
3
1
DIALING
PULSE
after this interrupts the alis -d system will stay in sleep mode. A user command to ringing
is mandatory.
after this interrupts the alis -d system will stay in ringing mode. A user command to active
or sleep is mandatory.
user has to programm clock_off bit and supply clock signal in case of external clock
first ring ends & no caller ID ||
off hook
on hook
no valid ring
clock_off Bit is 1
command
command
command
VERSATION
RINGING
SLEEP
DEEP
SLEEP
CON
no_auto_ring = 0
ringing &
65
Analog Line Interface Solution
wake_up
ring
cadence
ring
vdd
si0
si1
caller_id
vdd
si0
si1
(in no_auto_ring = 1 and
ring)
(if no_auto_ring = 0 and
second valid ring)
2
3
1
PSB 4595 / PSB 4596
Operating Modes
Data Sheet 06.98