IDT82V1671AJ IDT, Integrated Device Technology Inc, IDT82V1671AJ Datasheet - Page 25

• Manufacturer Part Number: IDT82V1671AJ
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT82V1671AJ

• Number Of Channels: 4
• On-hook Transmission: Yes
• Polarity Reversal: Yes
• On-chip Ring Relay Driver: Yes
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: PLCC
• Operating Temperature Classification: Industrial
• Pin Count: 28
• Mounting: Surface Mount
• Operating Current: 95mA
• Operating Supply Voltage (max): 3.465V
• Operating Supply Voltage (min): 3.135V
• Lead Free Status / RoHS Status: Compliant

IO2 pin) in LREG20 is changed, irrespective of whether the ringing
signal is at a zero-crossing or not. In this mode, even if the IO1 pin is
used to control the ring relay, it will act as a normal IO pin. In other
3.4.2.1
by an operational amplifier in the RSLIC and supplied to the CODEC via
the RTIN pin for ring trip detection. In external ringing mode, the level
meter will be involved when detecting the ring trip. For detailed
information about the level meter, please refer to
page
RSLIC & CODEC CHIPSET
In external ringing mode, the sensed ring current signal is processed
To detect ring trip, the steps below should be followed:
1. Select the RTIN as the input source to the DC path (LREG9:
2. Write the external ring trip threshold to HKthld in the Coe-RAM;
3. Set the CODEC to ACTIVE mode and set the RSLIC to External
4. The CODEC processes the RTIN signal and compares the result
40.
LM_SEL[3:0] = 1100);
Ringing mode (the chipset operating mode control bits are
different in MPI interface and GCI interface, refer to
details);
with the external ring trip threshold written in HKthld in the Coe-
RAM. If the threshold is exceeded, the corresponding HK[n] bit in
GREG26 (n = 0 to 3 corresponds to Channel 1 to 4) will be set to
Ring Trip Detection In External Ringing Mode
External R inging Voltage
IO [0] bit in LR E G 20
V
V
V
R S Y N C
R IN G
IO 1
S uppose a logic low on the
IO 1 pin starts the ringing.
“3.9.4 Level Meter” on
Figure - 12 External Ringing Synchronization
Table - 3
for
25
words, the hardware ring trip function is no longer available and the IO1
pin is controlled completely by software through the CODEC.
be introduced by the operational amplifier mentioned above. This offset
can be measured by the DC level meter and compensated by writing the
corresponding compensation value to DC Offset in the Coe-RAM.
ringing signal is applied to the Tip/Ring lines. The measuring procedure
is as follows (to understand the following descriptions, users should
understand the level meter first):
When detecting a ring trip, an offset voltage (about 10 to 30 mV) may
Before measuring this offset voltage, make sure that no external
1. Set the CODEC to ACTIVE mode and set the RSLIC to External
2. Select the RTIN as the input to the DC path of the CODEC
3. In LREG8, set DC_SRC = 1 and LM_SRC = 0;
4. Select the channel to be measured by setting the LM_CS[1:0] bits
5. Set the integrating time to 001H (GREG15 & GREG16:
6. Set the shift factor (K[3:0] in LREG9);
1, indicating that off-hook is detected.
Ringing mode (see
(LREG9: LM_SEL[3:0] = 1100);
in GREG16 accordingly;
LM_CN[10:0] = 001H);
IDT82V1671/IDT82V1671A, IDT82V1074
Table - 3
for details);
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