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TCAN1044-Q1, TCAN1044V-Q1

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SLLSF17A – AUGUST 2019 – REVISED DECEMBER 2019

Product Folder Links: TCAN1044-Q1 TCAN1044V-Q1

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Copyright © 2019, Texas Instruments Incorporated

Feature Description (continued)

8.3.5 Thermal Shutdown (TSD)

off the CAN driver circuitry and blocks the TXD to bus transmission path. The shutdown condition is cleared

TSD fault and the receiver to RXD path remains operational. If the fault condition that caused the TSD fault is still

present, the junction temperature may rise again and the device enters a TSD fault again. The TCAN1044-Q1

TSD circuit includes hysteresis which prevents the CAN driver output from oscillating during a TSD fault. If there

is prolonged exposure to a TSD fault condition the device reliability could be affected.

8.3.6 Undervoltage Lockout

protects the bus during an undervoltage event on either supply pin.

Table 2. Undervoltage Lockout - TCAN1044-Q1

Device State

Bus

RXD Pin

Normal

Per TXD

Mirrors Bus

Protected

High Impedance

High Impedance

(1)

See Remote Wake Request via Wake-Up Pattern (WUP) in Standby Mode

Table 3. Undervoltage Lockout - TCAN1044-Q1V

Device State

Bus

RXD Pin

Normal

Per TXD

Mirrors bus

Biased to GND

(1)

STB = GND: Protected mode

High impedance

Recessive

Protected

High impedance

High impedance

Protected

High impedance

High impedance

Once an undervoltage condition is cleared and the supply has returned to a valid level the TCAN1044-Q1

8.3.7 Unpowered Device

The TCAN1044-Q1 is designed to be an ideal passive or no load to the CAN bus if the device is unpowered. The

bus pins were designed to have low leakage currents when the device is unpowered, so they do not load the

bus. This is critical if some nodes of the network are unpowered while the rest of the of network remains

operational.

The logic pins also have low leakage currents when the device is unpowered, so they do not load other circuits

which may remain powered.