SI3225-BQ Silicon Laboratories Inc, SI3225-BQ Datasheet - Page 47
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SI3225-BQ
Manufacturer Part Number
SI3225-BQ
Description
IC SLIC/CODEC DUAL-CH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
ProSLIC®r
Specifications of SI3225-BQ
Package / Case
*
Function
Subscriber Line Interface Concept (SLIC), CODEC
Interface
GCI, PCM, SPI
Number Of Circuits
2
Voltage - Supply
3.3V, 5V
Current - Supply
65mA
Power (watts)
941mW
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Includes
Battery Switching, BORSCHT Functions, DTMF Generation and Decoding, FSK Tone Generation, Modem and Fax Tone Detection
Product
SLIC
Supply Voltage (min)
3.13 V
Supply Current
22 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Number Of Channels
2
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SI3225-BQ
Manufacturer:
Silicon Laboratories Inc
Quantity:
10 000
The output of the debounce filter remains in its present
state unless the input remains in the opposite state for
the entire period of time programmed by the loop
closure debounce interval, LONGDBI. If the debounce
interval is satisfied, the LONGHI bit is set to indicate
that a valid ground key event has occurred.
When the Si3220/25 detects a ground key event, the
linefeed automatically transitions from the TIP-OPEN
(or RING-OPEN) state to the FORWARD-ACTIVE (or
REVERSE-ACTIVE) state. However, this automatic
state transition is triggered by the LCR bit becoming
active (i.e., =1), and not by the LONGHI bit.
While I
a transition from TIP-OPEN to the FORWARD-ACTIVE
state (or from the RING-OPEN to the REVERSE-
ACTIVE state) occurs when the RING terminal (or TIP
terminal) is grounded and is based on the LCR bit and
implicitly on exceeding the LCROFFHK threshold.
As an example of ground key detection, suppose that
the Si3220/25 has been programmed with the current
values shown in Table 26.
With the settings of Table 26, the behavior of I
I
Table 27. The entries under “Loop State” indicate the
condition of the loop, as determined by the equipment
terminating the loop. The entries under “LINEFEED
Setting” indicate the state initially selected by the host
CPU (e.g., TIP-OPEN) and the automatic transition to
the FORWARD-ACTIVE state due to a ground key
event (when RING is connected to GND). The transition
from state #2 to state #3 in Table 27 is the automatic
transition from TIP-OPEN to FWD-ACTIVE in response
to LCR = 1.
LONG
Table 26. Settings for Ground Key Example
, LCR, LONGHI, and CMHIGH is as shown in
LONG
is used to generate the LONGHI status bit,
LONGLOTH
LCROFFHK
LONGHITH
LCRONHK
ILIM
21 mA
14 mA
10 mA
7 mA
5 mA
LOOP
Rev. 1.3
,
Si3220/25 Si3200/02
47