SI3011-F-FSR Silicon Laboratories Inc, SI3011-F-FSR Datasheet - Page 30

• Manufacturer Part Number: SI3011-F-FSR
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3011-F-FSR

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Si3050 + Si3011
Notes:
30
RCALD Bit
FOH[1] Bit
FOH[0] Bit
CALD Bit
1. The off-hook counter and calibrations prevent transmission or reception of data for 402.75 ms (default) for the line
2. The caller alert signal (CAS) tone transmits from the CO to signal an incoming call.
3. The device is taken on-hook to read the line voltage in the LVS bits to detect parallel handsets. In this mode, no data is
4. When the device returns off-hook, the normal off-hook counter is reduced to 8 ms. If the CALD and RCALD bits are set,
5. After allowing the off-hook counter to expire (8 ms), normal transmission and reception can continue. If CID data
d. Clear the OH bit (Register 5, bit 0). This puts the
e. Read the LVS bits to determine the state of the
f. Set the OH bit to return to an off-hook state.
OH Bit
to reduce the time period for the off-hook counter
to 8 ms allowing compliance to the Type II CID
timing requirements.
DAA into an on-hook state. The RXM bit
(Register 15, bit 3) also can be set to mute the
receive path.
line. If the LVS bits read the typical on-hook line
voltage, then there are no parallel devices active
on the line, and CID data reception can be
continued. If the LVS bits read well below the
typical on-hook line voltage, then there are one or
more devices present and active on the same line
that are not compliant with Type II CID. Do not
continue CID data reception.
Immediately after returning to an off-hook state,
the off-hook counter must be allowed to expire.
This allows the line voltage to settle before
transmitting or receiving data. After 8 ms normal
data transmission and reception can begin. If a
non-compliant parallel device is present, then a
reply tone is not sent by the host tone generator
and the CO does not send the CID data. If all
voltage to settle.
transmitted on the DTX pin.
then the automatic calibrations are not performed.
reception is required, send the appropriate signal to the CO at this time.
LINE
On-Hook
Figure 24. Implementing Type II Caller ID on the Si3050+Si3011
(402.75 ms nominally)
Off-Hook Counter
and Calibration
1
Of f -Hook
Rev. 1.11
3. The CO then responds with CID data after receiving
4. The muting of the upstream data path by the host
5. The CALD and the RCALD bits can be cleared to
Because of the nature of the low-power ADC, the data
presented on DTX can have up to a 10% dc offset. The
caller ID decoder must either use a high-pass or a
band-pass filter to accurately retrieve the caller ID data.
CA S Tone
Received
the CID data, the host processor unmutes the
upstream data output and continues with normal
operation.
processor mutes the handset in a telephone
application so the user cannot hear the
acknowledgement tone and CID data being sent.
re-enable the automatic calibrations when going
off-hook. The FOH[1:0] bits also can be programmed
to 01 to restore the default off-hook counter time.
devices on the line are Type II CID compliant,
then the host must mute its upstream data output
to avoid the propagation of its reply tone and the
subsequent CID data. When muting its upstream
data output, the host processor should return an
acknowledgement (ACK) tone to the CO
requesting transmission of CID data.
2
On-Hook
3
Off-Hook Counter
(8 ms)
4
Of f -Hook
A ck
5