Specifications

Si2404
Rev. 0.91 51
Reset settings = 0x2700
U70 IO0
Bit D15D14D13D12D11D10D9 D8 D7D6D5D4D3D2D1D0
Name
HES TES CIDM OCDM PPDM RIM DCDM 0 CID OCD PPD RI DCD
Type
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Bit Name Function
15 HES Hardware Escape Pin.
0 = Disable.
1 = Enable.
14 Reserved Read returns zero.
13 TES Enable “+++” Escape.
0=Disable.
1=Enable.
12 CIDM Caller ID Mask.
0 = Change in CID will not affect INT.
1 = A low to high transition in CID activates INT
.
11 OCDM Overcurrent Detect Mask.
0 = Change in OCD does not affect INT. (“X” result code is not generated in command
mode.)
1 = A low to high transition in OCD will activate INT. (“X” result code is generated in command
mode.)
10 PPDM Parallel Phone Detect Mask.
0 = Change in PPD does not affect INT
.
1 = A low to high transition in PPD will activate INT.
9RIMRing Indicator.
0 = Change in RI does not affect INT
.
1 = A low to high transition in RI activates INT.
8DCDMData Carrier Detect Mask.
0 = Change in DCD does not affect INT
.
1 = A high to low transition in DCD (U70, bit 0), which indicates loss of carrier, activates
INT.
7 Reserved Must be set to zero.
6:5 Reserved Read returns zero.
4CIDCaller ID (sticky).
Caller ID preamble has been detected; data will soon follow. Clears on :I read.
3OCDOvercurrent Detect (sticky).
Overcurrent condition has occurred. Clears on :I read.
2 PPD Parallel Phone Detect (sticky).
Parallel phone detected since last off-hook event. Clears on :I read.
1RIRing Indicator.
Active high bit when the Si2404 is on-hook, indicates ring event has occurred. Clears on :I
read.
0DCDData Carrier Detect (status).
Active high bit indicates carrier detected (equivalent to inverse of DCD
pin).