SI3018-F-FSR Silicon Laboratories Inc, SI3018-F-FSR Datasheet - Page 78

• Manufacturer Part Number: SI3018-F-FSR
• Description: Modem Chip Chipset 16-Pin SOIC T/R
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3018-F-FSR

• Package: 16SOIC
• Main Category: Chipset
• Sub-category: Data/Voice
• Typical Operating Supply Voltage: 3.3 V
• Power Supply Type: Digital
• Typical Supply Current: 8.5 mA
• Minimum Operating Supply Voltage: 3 V
• Maximum Operating Supply Voltage: 3.6 V
• Data Rate: 54.6875Kbps
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Pin Count: 16
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

Si3050 + Si3018/19
Register 24. Ring Validation Control 3
Reset settings = 0001_1001
Register 25. Resistor Calibration
Reset settings = xx0x_xxxx
78
Bit
5:0
Bit
3:0
7
6
7
6
5
4
Name
Name
Type
Type
Bit
Bit
RCAL[3:0] Always write back the value read.
Reserved
RCALM
RCALS
RCALD
Reserved
Name
RAS[5:0]
RNGV
Name
RCALS
RNGV
R/W
D7
D7
R
Resistor Auto Calibration.
0 = Resistor calibration is not in progress.
1 = Resistor calibration is in progress.
Manual Resistor Calibration.
0 = No calibration.
1 = Initiate manual resistor calibration. (After a manual calibration has been initiated, this bit
must be cleared within 1 ms.)
Resistor Calibration Disable.
0 = Internal resistor calibration enabled.
1 = Internal resistor calibration disabled.
This bit can be written to a 0 or 1.
Ring Validation Enable.
0 = Ring validation feature is disabled.
1 = Ring validation feature is enabled in both normal operating mode and low-power
mode.
This bit must always be written to 0.
Ring Assertion Time.
These bits set the minimum ring frequency for a valid ring signal. During ring qualification,
a timer is loaded with the RAS[5:0] field upon a TIP/RING event and decrements at a reg-
ular rate. If a second or subsequent TIP/RING event occurs after the timer has timed out
then the frequency of the ring is too low and the ring is invalidated. The difference between
RAS[5:0] and RMX[5:0] identifies the minimum duration between TIP/RING events to qual-
ify as a ring, in binary-coded increments of 2.0 ms (nominal). A TIP/RING event typically
occurs twice per ring tone period. At 20 Hz, TIP/RING events would occur every
1/(2 x 20 Hz) = 25 ms. To calculate the correct RAS[5:0] value for a frequency range
[f_min, f_max], the following equation should be used:
RCALM
R/W
D6
D6
RCALD
R/W
D5
D5
Rev. 1.31
RAS 5:0
D4
D4

Function
Function


------------------------------------------ -
2 f_min

D3
D3
RAS[5:0]
1
R/W

2 ms
D2
D2
RCAL[3:0]
R/W
D1
D1
D0
D0