SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 80

• Manufacturer Part Number: SI2493-C-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FS

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN93
3.3.18. U46–U48 (DTMF Dial Registers)
U46–U48 set the DTMF power level, DTMF on time, and DTMF off time, respectively (see Table 40). The DTMF
power level set in register U46 is a 16-bit hexadecimal value with the format 0x0(H)(L)0, where H is a hexadecimal
number (0–F) for the dBm level of the high-frequency DTMF tone, and L is a hexadecimal number (0–F) for the
dBm level of the low-frequency DTMF tone. The difference between the level of the high-frequency tone and the
low-frequency tone is called “twist” and can be set with the choice of the H and L values in –1 dBm steps. The
DTMF output level is 0 dBm for each tone if U46 = 0x0000 and –15 dBm if U46 = 0x0FF0. The default power level
is –9 dBm for the high tone and –11 dBm for the low tone.
U47 and U48 set the DTMF on time (DTNT) and DTMF off time (DTFT) respectively as a hexadecimal value with
ms units. The default value for both U47 and U48 is 100 ms, and the range of values is 0–1000 ms.
80
Register
Register
U3A
U3B
U3C
U3D
U3E
U3F
U37
U38
U39
U40
U42
U43
U45
U46
U47
U48
PDMT
Name
PDBT
Name
DTNT
DTPL
DTFT
PDIT
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PD8
PD9
Number of pulses to dial 0.
Number of pulses to dial 1.
Number of pulses to dial 2.
Number of pulses to dial 3.
Number of pulses to dial 4.
Number of pulses to dial 5.
Number of pulses to dial 6.
Number of pulses to dial 7.
Number of pulses to dial 8.
Number of pulses to dial 9.
Pulse dial break time (ms units).
Pulse dial make time (ms units).
Pulse dial interdigit time (ms units).
DTMF power level
DTMF on time (ms units).
DTMF off time (ms units).
Table 40. DTMF Dial Registers
Table 39. Pulse Dial Registers
Rev. 0.9
Description
Description
Default
0x000A
0x003D
Default
0x09B0
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
0x0027
0x0320
0x0064
0x0064