SI3232-BQ Silicon Laboratories Inc, SI3232-BQ Datasheet - Page 29

• Manufacturer Part Number: SI3232-BQ
• Description: IC SLIC PROG DUAL-CH 64TQFP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3232-BQ

• Package / Case: *
• Function: Subscriber Line Interface Concept (SLIC)
• Interface: ISDN
• Number Of Circuits: 2
• Voltage - Supply: 3.13 V ~ 3.47 V
• Current - Supply: 28mA
• Power (watts): 280mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Product: SLIC
• Supply Voltage (min): 3.13 V
• Supply Current: 28 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

consumed by the Si3232 during the on-hook state
results in very little power dissipation while being
powered from the ringing battery supply, which can
have an amplitude as high as 100 V depending on the
desired ringing amplitude.
The BATSEL pins serve to switch between the two
battery voltages based on the operating state and the
TIP-RING voltage. Figure 12 illustrates the chip
connections required to implement an automatic dual
battery switching scheme. When BATSEL is pulled low,
the desired channel is powered from the V
When BATSEL is pulled high, the V
supply power to the desired channel.
The BATSEL pins for both channels are controlled using
the BATSEL bit of the RLYCON register and should be
programmed to automatically switch to the lower battery
supply (V
sensed.
Two thresholds are provided to enable battery switching
with hysteresis. The BATHTH RAM location specifies
the threshold at which the Si3232 will switch from the
Parameter
High Battery Detect Threshold
Low Battery Detect Threshold
Ringing Battery Switch
Battery Select Indicator
Battery Switching LPF
*Note: The usable range for BATHTH and BATLTH is limited to the
BLO
) whenever an off-hook condition is
Table 17. Register and RAM Locations used for Battery Switching
Register/RAM
BHI
Mnemonic
RLYCON
RLYCON
BATHTH
BATLTH
BATLPF
BLO
source will
Preliminary Rev. 0.95
supply.
low battery, V
off-hook to on-hook transition. The BATLTH RAM
location specifies the threshold at which the Si3232 will
switch from V
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
equation below and is entered into the BATLPF RAM
location.
BATLPF = [(2
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
(0A10h) is sufficient to filter out any unwanted ac
artifacts while allowing the dc information to pass
through the filter.
Table 17 provides the register and RAM locations used
for programming the battery switching functions.
V
Register/RAM
BATHTH[14:0]
BATLTH[14:0]
BATLPF[15:3]
BHI
BSEL
voltage.
GPO
Bits
BHI
π
BLO
f x 4096)/800] x 2
to V
, to the high battery, V
BLO
Programmable
0 to 160.173 V
0 to 160.173 V
due to a transition from the on-
0 to 4000
Range
Toggle
Toggle
3
*
*
Si3232
BHI
Resolution
(LSB Size)
(4.907 mV)
(4.907 mV)
, due to an
628 mV
628 mV
N/A
N/A
N/A
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