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ZHCSEK9D March 2016 – October 2021 TCAN1042H , TCAN1042HG , TCAN1042HGV , TCAN1042HV

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9.3.3 Undervoltage Lockout

The supply terminals have undervoltage detection that places the device in protected mode. This protects the bus during an undervoltage event on either the V_CC or V_IO supply terminals.

Table 9-1 Undervoltage Lockout 5 V Only Devices (Devices without the "V" Suffix)

V_CC	DEVICE STATE⁽¹⁾	BUS OUTPUT	RXD
> UV_VCC	Normal	Per TXD	Mirrors Bus⁽²⁾
< UV_VCC	Protected	High Impedance	High Impedance

(1) See the V_IT section of the Electrical Characteristics.

(2) Mirrors bus state: low if CAN bus is dominant, high if CAN bus is recessive.

Table 9-2 Undervoltage Lockout I/O Level Shifting Devices (Devices with the "V" Suffix)

V_CC	V_IO	DEVICE STATE	BUS OUTPUT	RXD
> UV_VCC	> UV_VIO	Normal	Per TXD	Mirrors Bus⁽¹⁾
< UV_VCC	> UV_VIO	STB = High: Standby Mode	Recessive	Bus Wake RXD Request⁽²⁾
< UV_VCC	> UV_VIO	STB =Low: Protected Mode	High Impedance	High (Recessive)
> UV_VCC	< UV_VIO	Protected	High Impedance	High Impedance
< UV_VCC	< UV_VIO	Protected	High Impedance	High Impedance

(1) Mirrors bus state: low if CAN bus is dominant, high if CAN bus is recessive.

(2) Refer to Section 9.4.3.1

Note:

After an undervoltage condition is cleared and the supplies have returned to valid levels, the device typically resumes normal operation within 50 µs.