SI2414 SILABS [Silicon Laboratories], SI2414 Datasheet - Page 42

• Manufacturer Part Number: SI2414
• Manufacturer: SILABS [Silicon Laboratories]

Si2456/Si2433/Si2414
User-Access Registers (U-Registers)
The :U AT command is used to write these 16-bit U-registers, and the :R command is used to read them. U-
registers are identified by a hexidecimal (hex) address.
42
Register
U0A
U0B
U0C
U0D
U0E
U00
U01
U02
U03
U04
U05
U06
U07
U08
U09
U0F
U10
U12
U13
U14
U15
U16
U11
Address
0x000A
0x000B
0x000C
0x000D
0x000E
0x0000
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
0x000F
0x0010
0x0011
0x0012
0x0013
0x0014
0x0015
0x0016
(Hex)
DT3A0
DT1A0
DT1B1
DT1B2
DT1A2
DT1A1
DT2A0
DT2B1
DT2B2
DT2A2
DT2A1
DT3B1
DT3B2
DT3A2
DT3A1
DT4A0
DT4B1
DT4B2
DT4A2
DT4A1
DTON
Name
DTOF
DTK
Description
DT1 registers set the coefficients for stage 1 of the Dial Tone Detect
filter. Biquad coefficients can be programmed as 16-bit 2s comple-
ment values scaled as 1.0 = 0xC000 with the formula:
Default is for FCC countries. See "Appendix C—User-Access Reg-
ister Settings" on page 73 for other country settings.
Dial tone detect filters stage 2 biquad coefficients.
Dial tone detect filters stage 3 biquad coefficients.
Dial tone detect filters stage 4 biquad coefficients.
Dial tone detect filter output scaler.
Dial tone detect ON threshold.
Dial tone detect OFF threshold.
H(z) =
Table 21. U-Register Description
A0 + A1z
1 + B1z
Rev. 0.9
–1
–1
+ B2z
+ A2z
–2
–2
0x6EF1
0xC4F4
0xC000
0xC305
0xB50A
0x70D2
0xC830
Default
0x00A0
0x00A0
0x78B0
0x80E2
0x00A0
0x0800
0x0000
0x0000
0x0000
0x0000
0x0000
0x4000
0x0400
0x4000
0x0009
0x0070