and RX TX

Wake

WAKE = L

CUR_OK = Z

Driver = ON

Receive

Only

CUR_OK = Z

WAKE = Z

Driver = OFF

Receive and

Transmit

CUR_OK = Z

WAKE = Z

Driver = ON

Current

Fault

WAKE = Z

CUR_OK = L

Driver = ON

Thermal

Shutdown

CUR_OK = Z

WAKE = Z

Driver = OFF

EN

EN

*

CQ

@

for t

> t

WU

2

EN

*

T >

SN65HVD101, SN65HVD102

www.ti.com

SLLSE84B – MAY 2011 – REVISED APRIL 2015

Feature Description (continued)

If the output current at CQ remains at the internally set current limit IO(LIM) for a duration longer than a wake-up

pulse (longer than 80

μs), the CUR_OK pin is driven logic low, indicating an over-current condition. The

CUR_OK pin returns to the high-impedance (inactive) state when the CQ pin is no longer in a current limit

condition. The state diagram shown in Figure 9 illustrates the various states; and, under what conditions the

device transitions from one state to another.

If the voltage at CQ is between the upper and lower receiver input threshold, CUR_OK remains high-impedance.

Figure 9. State Diagram of Device Transceiver

9.3.5 Over-temperature Detection

If the transceiver’s internal temperature exceeds its over-temperature threshold

voltage regulator (HVD101) are disabled. As soon as the temperature drops below the temperature threshold,

the internal circuit re-enables the voltage regulator (HVD101) and the driver, subject to the state of the EN and

TX pins.

9.3.6 CQ Current-limit Adjustment

Copyright © 2011–2015, Texas Instruments Incorporated

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