PL460 datasheet(17/48 Pages) MICROCHIP

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PL460

Input/Output Lines

Data Sheet

DS60001666D - 17

6.5.

Transmission Enabled (TXEN) Pin

The TXEN pin is unidirectional. It is managed by the external host controller and has to be driven

high to enable the PLC transmission. If the transmissions are disabled, ongoing/programmed

transmission (if any) will be aborted and subsequent requests will be denied.

6.6.

Zero-Cross Detection (VZC) Pin

The VZC pin is unidirectional. The input signal must be a digital pulse train directly related to

the mains voltage. For more information about how the PL460 detects the zero-cross, refer to

Zero-Crossing Detection.

Additionally, the VZC pin is used during fuse programming to enter in the programming mode. For

more information about fuse programming, refer to Fuse Programming.

6.7.

Thermal Monitor Pins (THEN, NTHW0, THW1, G1)

An on-die temperature monitor with two warning thresholds and hysteresis is included in the PL460

to improve product reliability by avoiding high power dissipation situations. This risky condition

might occur during PLC transmission in case of very low impedance load and high-level output

signal conditions.

The input pin THEN is used to enable the thermal monitor functionality. Connecting it directly to the

ENABLE pin is recommended to control both of them at the same time.

The open-drain outputs, NTHW0 and THW1, are used to notify high temperature conditions as it is

indicated in Table 6-1:

Table 6-1. Thermal Warning Temperature Threshold and Output Status

Output

Thermal Threshold (℃)

Output Status

Rise

Fall

Tdie≥ Tth

Tdie< Tth

NTHW0

110

100

Low

HiZ

THW1

120

110

HiZ

Low

The first output, NTHW0, can be connected to the host controller to manage the temperature

warning, but the second output, THW1, must be connected directly to the PL460 in order to manage

the temperature warning itself. The pin G1 is configured in the PLC-protocol firmware to be used as

an input interrupt for the thermal warning THW1, therefore it is recommended to connect the THW1

and G1 pins directly.

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