AFE032 datasheet(63/77 Pages) TI1

63 / 77 page

Phase

Neutral

Low-Voltage

Capacitor

High-Voltage

Capacitor

Power

Amplifier

0.1 F

10 kW

(typ)

10 kW

(typ)

10 kW

(typ)

10 kW

(typ)

TMP411

D+

D-

V+

GND

SCL

SDA

ALERT/THERM2

THERM

+3.3 V

SMBus

Controller

Overtemperature

Fault

50 pF

50 W

TSENSE

AFE032

www.ti.com

SBOS669A – AUGUST 2013 – REVISED DECEMBER 2013

TSENSE (Pin 35)

The TSENSE pin is internally connected to the anode of a temperature-sensing diode located within the PA

output stage. Figure 26 shows a remote junction temperature sensor circuit that can be used to measure the

device junction temperature. Measuring the device junction temperature is optional and is not required.

Figure 26. Interfacing the TMP411 to the AFE032

TX_FLAG (Pin 47)

The TX_FLAG pin is an open-drain output that indicates the readiness of the Tx signal path for transmission.

When the TX_FLAG pin is high, the transmit signal path is enabled and ready for transmission. When the

TX_FLAG pin is low, the transmit path is not ready for transmission.

RX_FLAG (Pin 48)

The RX_FLAG pin is an open-drain output that indicates the readiness of the Rx signal path for transmission.

When the RX_FLAG pin is high, the transmit signal path is enabled and ready for transmission. When the

RX_FLAG pin is low, the transmit path is not ready for transmission.

LINE-COUPLING CIRCUIT

The line-coupling circuit is one of the most critical circuits in a power-line modem. The line-coupling circuit has

two primary functions: first, to block the low-frequency signal of the mains (commonly 50 Hz or 60 Hz) from

damaging the low-voltage modem circuitry; second, to couple the modem signal to and from the ac mains. A

typical line-coupling circuit is shown in Figure 27.

Figure 27. Simplified Line-Coupling Circuit

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