SI3225-GQ Silicon Laboratories Inc, SI3225-GQ Datasheet - Page 41

• Manufacturer Part Number: SI3225-GQ
• Description: IC SLIC/CODEC DUAL-CH 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3225-GQ

• 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: Lead free / RoHS Compliant

When generating a high-voltage ringing amplitude using
the Si3220, the power dissipated during the OHT state
typically increases due to operating from the ringing
battery supply in this mode. To reduce power, the
Si3220/Si3200
accommodate up to three separate battery supplies by
implementing a secondary battery switch using a few
low-cost external components as illustrated in Figure
22. The Si3220’s BATSEL pin is used to switch between
the V
BHI
(typically –48 V) and V
V
chipset
V
V
BRING
BLO
BHI
Figure 19. External Battery Switching Using the Si3220/Si3225
provides
Figure 20. 3-Battery Switching with Si3220/Si3200
V
V
BLO
BHI
806 kΩ
BLO
0.1 µF
0.1 µF
SVBAT
(typically
VBATH
VBAT
VBATL
the
Si3200
806 kΩ
Si3220
Si3225
ability
BATSEL
Battery
Sense
Circuit
Si3200
VBATH
VBATL
VBAT
Linefeed
Circuitry
Rev. 1.0
to
–24 V) rails using the switch internal to the Si3200. The
Si3220’s GPO pin is used along with the external
transistor circuit to switch the V
voltage battery rail) onto the Si3200’s V
ringing is enabled. The GPO signal is driven
automatically by the ringing cadence provided that the
RRAIL bit of the RLYCON register is set to 1 (signifying
that a third battery rail is present).
SVBAT
IN4003
Battery
Control
Logic
40.2 kΩ
D1
R9
Si3220
R102
Q2
CXT5551
Q1
BATSEL
Battery
Control
Select
10 kΩ
R101
BATSEL
CXT5401
40.2 kΩ
R103
402 kΩ
Si3220/Si3225
BRING
rail (the ringing
BAT
pin when
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