SI2457-D-FT Silicon Laboratories Inc, SI2457-D-FT Datasheet - Page 146

• Manufacturer Part Number: SI2457-D-FT
• Description: IC ISOMODEM SYSTEM-SIDE 24TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2457-D-FT

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AN93
6.2.2.3. Special Requirements for India
To output a 0 dBm sine wave, use the following commands:
AT:PF800, C4DD, 7B5C, 595F
AT*Y254:W50, 0, 5B86,1
AT:U46,0
AT*Y1X1DT1
This command string turns off the high-frequency DTMF tone, leaving only the low-frequency DTMF tone when an
ATDT is sent. The tone is output continuously until any key is pressed. To restart the tone output, type AT*Y1DT1.
To change the tone power level, type ATU46,00X0 (where X is a hexadecimal value 0–F representing output power
in –1 dBm steps from 0 to –15 dBm).
146
Register Bit
U37–U40
9 ILIM
Register
13:12
Table 93. Line Interface/Control Registers
U67:
MINI
U4D
U50
U51
U52
U68
U42
U43
U45
U46
U47
U48
3:2
10
1
0
7
6
1
0
2
1
0
Table 92. Dial Registers
PDMT
Value
PDBT
DTNT
DTPL
DTFT
PDIT
Pulse Dial Control
CLPD
LCDN
XMTL
Value
LCDF
DCR
OHS
ROV
DCV
LCN
BTE
BTD
LLC
RZ
RT
DTMF Control
Rev. 1.3
Function
Check Loop Current Before
Dialing
Low Loop Current Detect
(set for legacy TBR21)
Loop Current Needed
Loop Current Debounce
On Time
Loop Current Debounce
Off Time
Transmit Level
DC Impedance Select
On-Hook Speed
DC Termination Select
Ringer Impedance
Ringer Threshold Select
Billing Tone Protect Enable
Receive Overload
Billing Tone Detected
Function
Pulse per Digit Definition
Pulse Dial Break Time
Pulse Dial Make Time
Pulse Dial Interdigit Time
DTMF Power Level (and
Twist)
DTMF On Time
DTMF Off Time