SI3220-KQ Silicon Laboratories Inc, SI3220-KQ Datasheet - Page 39

• Manufacturer Part Number: SI3220-KQ
• Description: IC SLIC/CODEC DUAL-CH 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3220-KQ

• 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: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Includes: Battery Switching, BORSCHT Functions, DTMF Generation and Decoding, FSK Tone Generation, Modem and Fax Tone Detection
• Product: Telecom
• Supply Voltage (min): 3.13 V
• Supply Current: 22 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Number Of Channels: 2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Two thresholds are provided to enable battery switching
with hysteresis. The BATHTH RAM location specifies
the threshold at which the Dual ProSLIC device
switches from the low battery (V
(V
BATLTH RAM location specifies the threshold at which
the Si3220/Si3225 switches from V
a transition from the on-hook or ringing state to the off-
hook state or because the overhead during active Off-
Hook mode is sufficient to feed the subscriber loop
using a lower battery voltage.
The low pass filter coefficient is calculated using the
BATH
Parameter
Battery Select Switch
High Battery Detect Threshold
Low Battery Detect Threshold
Ringing Battery Switch (Si3220 only)
Battery Select Indicator
Battery Switching LPF
*Note: Usable range for BATHTH and BATLTH is limited to VBATH.
) due to an off-hook to on-hook transition. The
Table 23. Register and RAM Locations Used for Battery Switching
Figure 22. External Battery Switching Using the Si3220/Si3225
V
V
BATH
BATL
806 kΩ
BATL
SVBAT
BATH
) to the high battery
to V
Register/RAM
Si3220
Si3225
Mnemonic
BATL
RLYCON
RLYCON
RLYCON
BATHTH
BATLTH
BATLPF
Battery
Preliminary Rev. 0.91
Sense
Circuit
Si3200
V
V
V
due to
BATH
BATL
BAT
Linefeed
Circuitry
equation below and is entered into the BATLPF RAM
location.
BATLPF = [(2 π f x 4096)/800]
Where f = the desired cutoff frequency of the filter
The programmable range of the filter is from 0 (blocks
all signals) to 4000h (unfiltered). A typical value of
10 Hz (0A10h) is sufficient to filter out any unwanted ac
artifacts while allowing the dc information to pass
through the filter.
Table 23 provides the register and RAM locations used
for programming the battery switching functions.
Battery
Control
Logic
Register/RAM
BATHTH[14:7]
BATLTH[14:7]
BATLPF[15:3]
BATSEL
BSEL
GPO
Bits
BATSEL
Battery
Control
Select
BATSEL
40.2 kΩ
Programmable
0 to 160.173 V*
0 to 160.173 V*
0 to 4000h
Si3220/Si3225
Range
Toggle
Toggle
Toggle
Resolution
(LSB Size)
(4.907 mV)
(4.907 mV)
628 mV
628 mV
N/A
N/A
N/A
N/A
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