LCR1210-R100F datasheet(33/59 Pages) SKYWORKS

33 / 59 page

Si32260/1

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

Rev. 1.4 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 7, 2021

5.6. Loop Closure Detection

The Si32260/1 provides a completely programmable

loop closure detection mechanism. The loop closure

detection scheme provides two unique thresholds to

allow hysteresis, and also includes a programmable

debounce filter to eliminate false detection. A loop

closure detect status bit provides continuous status, and

a maskable interrupt bit is also provided.

5.7. Ground Key Detection

The

Si32260/1

provides

ground

key

detect

mechanism using a programmable architecture similar

to the loop closure scheme. The ground key detect

scheme provides two unique thresholds to allow

hysteresis and also includes a programmable debounce

filter to eliminate false detection. A ground key detect

status bit provides continuous status, and a maskable

interrupt bit is also provided.

5.8. Ringing Generation

The Si32260/1 provides the ability to generate a

programmable

sinusoidal

trapezoidal

ringing

waveform, with or without dc offset. The ringing

frequency, wave shape, cadence, and offset are all

supported: balanced, unbalanced, and low-power

ringing (LPR). Figure 22 illustrates the fundamental

differences between the three ringing modes.

The dual ProSLIC’s adaptive ringing capability allows

further power savings to be realized in systems

designed for long loop applications. In a long loop

system, it may be necessary to generate a large ringing

voltage to ensure that sufficient voltage is presented to

a phone at the far end of the loop. However, in

situations when a short loop is connected to an FXS

interface that was designed with the ability to ring long

loops, the large ringing voltage in combination with a

low resistance load will result in excessive and

unnecessary power consumption. Skyworks Solutions’

Si32260/1 dual ProSLICs eliminate this unnecessary

power

consumption

with

their

adaptive

ringing

capability. The ProSLIC automatically senses when

excessive power is being consumed in the line feed

circuit (due to the lower resistance of a short loop) and

will iteratively reduce the ringing amplitude to a voltage

that is appropriate for the load.

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