STLC30R81

4/17

THERMAL DATA

OPERATING MODES

It is possible to choose several operating modes just setting the proper Input D0, D1, D2, and D3. The table

below (Tab.1) shows these modes:

Table 1. Ctrl Interface

Power Down

It's an idle state characterized by very low power consumption; any functionality is disabled. It can be set during

out of service periods just to reduce the power consumption.

It is worth remarking that two other conditions can set the SLIC in IDLE state but with some differences as re-

ported in the table below.

Table 2. Power down

Stand By

Mode selected in On-Hook condition when high immunity to the common mode currents is needed to prevent

false Off-Hook detection. To reduce the current consumption, AC feedback loop is disabled. Only DET and

Symbol

Parameter

Value

Unit

Thermal resistance Junction to Ambient (2 layer board) Typ.

32

°C/W

Thermal resistance Junction to Ambient (1 layer board) Typ.

56

°C/W

Inputs

Operating Mode

Output

D0

D1

D2

D3

DET

GDK/AL

0

0

0

0

Power down

Disable

Disable

0

0

0

1

Power down

Disable

Disable

1

1

0

1

Power down

Disable

Disable

0

0

1

0

Stand-by

Off-Hook

Gnd-Key

0

1

0

0

Active normal polarity

Off-Hook

Gnd-Key

0

1

1

0

Active reverse polarity

Off-Hook

Gnd-Key

1

0

0

0

Trapezoidal ringing normal polarity

Ringing trip

Gnd-Key

1

0

1

0

Trapezoidal ringing reverse polarity

Ringing trip

Gnd-Key

1

1

0

0

Ground start

Off-Hook

Gnd-Key

1

1

1

0

High impedance feeding

Off-Hook

Disable

0

1

0

1

Active normal polarity (On-Hook transmission)

Off-Hook

Gnd-Key

0

1

1

1

Active reverse polarity (On-Hook transmission)

Off-Hook

Gnd-Key

1

0

0

1

Ringing In Sinusoidal (or PWM) wave Rxin+/- In

Ringing trip

Gnd-Key

1

0

1

1

Ringing In Sinusoidal (or PWM) wave Rg+/- In

Ringing trip

Gnd-Key

0110

⇒1110

Test mode: phone detection

Phone detect

Disable

0

0

1

1

Test mode: loop back

Off-Hook

Disable

1

1

1

1

Test mode: short circuit detection

Phone short

Disable

IDLE STATE

DET

GDK/AL

Power down command

Disable

Disable

Reset

Disable

Disable

Thermal alarm

Low

Low