LCR1210-R100F datasheet(31/59 Pages) SKYWORKS

31 / 59 page

Si32260/1

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

5. FXS Features

5.1. DC Feed Characteristics

ProSLIC internal linefeed circuitry provides completely

programmable dc feed characteristics.

When in the active state, the ProSLIC operates in one of

three dc linefeed operating regions: a constant-voltage

region, a constant-current region, or a resistive region,

as shown in Figure 21. The constant-voltage region has

a low resistance, typically 160

. The constant-current

region approximates infinite resistance.

Figure 21. Dual ProSLIC DC Feed

Characteristics

5.2. Linefeed Operating States

The linefeed interface includes nine different register-

programmable operating states as listed in Table 18.

The Open state is the default condition in the absence

of any preloaded register settings. The device may also

automatically enter the open state in the event of a

linefeed fault condition.

5.3. Line Voltage and Current Monitoring

The ProSLIC continuously monitors the TIP, RING, and

battery voltages and currents via an on-chip ADC and

stores the resulting values in individual RAM locations.

Additionally, the loop voltage (VTIP–VRING), loop current,

and longitudinal current values are calculated based on

the TIP and RING measurements and are stored in

unique register locations for further processing. The

ADC updates all registers at a rate of 2 kHz or greater.

5.4. Power Monitoring and Power Fault

Detection

The Si32260/1 line monitoring functions are used to

continuously

protect

against

excessive

power

conditions. The Si32260/1 contains on-chip, analog

sensing diodes that turn off the device when a preset

temperature threshold is exceeded.

If the Si32260/1 detects a fault condition or overpower

condition, it automatically sets that line to the open state

and generates a "power alarm" interrupt.

The interrupt can be masked, but masking the

automatic transition to open is not recommended.

The various power alarms and linefeed faults supporting

automatic intervention are described below.

1. Total power exceeded.

2. Excessive foreign current or voltage on TIP and/or

RING.

3. Thermal shutdown event.

5.5. Thermal Overload Shutdown

If the die temperature exceeds the maximum junction

temperature threshold (TJmax) of 145 or 200 °C,

depending on the operating state, the device has the

ability to shut itself down to a low-power state without

user intervention.

ILOOP (mA)

I_RFEED

VTR(V)

I_ILIM

I_VLIM

Resistive Region

Constant V Region

V_VLIM

V_RFEED

V_ILIM

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