THVD8010DDFR datasheet(17/27 Pages) TI

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8.4 Device Functional Modes

Table 8-2. Functional Modes

F_SET Configuration

Device Functional Mode

RF_SET between F_SET and GND

OOK mode, f0 set by the RF_SET value

F_SET at high impedance

Invalid, not recommended for normal operation

F_SET at VCC

F_SET short to GND

8.4.1 OOK Mode

Data at the D input is modulated with the carrier frequency set by the R F_SET value when the device is

transmitting (MODE = VCC). See Section 8.3.1 section for more details. In receiving (MODE = GND), the device

expects an OOK modulated signal at the A and B inputs. The data is demodulated and sent out via R pin. See

Section 8.3.2 section for more details.

Table 8-3. Driver function table for OOK mode

INPUTS

OUTPUTS

FUNCTION

F_SET

MODE

RF_SET (See Table 8-1)

H or Z

Bias to VCM

Driver is actively biased to

VCM on the bus

Oscillating

Bus actively driven at

carrier frequency

L or Z

Driver disabled, device in

receive mode

Table 8-4. Receiver function table for OOK mode

INPUTS

OUTPUT

FUNCTION

F_SET

MODE

Input

RF_SET (See Table 8-1)

L or Z

Oscillating at F_SET and VID > V

MAG_ZERO

Receive valid bus low

L or Z

Oscillating at F_SET and V

MAG_ONE < VID < VMAG_ZERO

Receive invalid bus, output

indeterminate

L or Z

Oscillating at F_SET and VID < V

MAG_ONE

Receive valid bus high

L or Z

Z / not oscillating

Receive valid bus high

L or Z

OPEN, SHORT, IDLE (VID = 0 V)

Failsafe high output

Receiver disabled, device in

transmit mode

8.4.2 Thermal shutdown (TSD)

The THVD8010 has a protection feature called thermal shutdown. When the junction temperature reaches TSD,

the device enters thermal shutdown protection mode. This mode disables the driver and receiver outputs, which

will halt all communication through the device. Normal operation resume once the junction temperature drops out

of thermal shutdown, which is typically TSD - THYS.

www.ti.com

THVD8010

SLLSFK4 – NOVEMBER 2020

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