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ZHCSEG6F December 2015 – May 2025 TCAN330 , TCAN330G , TCAN332 , TCAN332G , TCAN334 , TCAN334G , TCAN337 , TCAN337G

PRODUCTION DATA

封裝選項

機械數據 (封裝 | 引腳)

D|8
- MSOI002K
DCN|8
- MPDS099C

散熱焊盤機械數據 (封裝 | 引腳)

DCN|8
- PPTD193B

訂購信息

6.4.1 CAN Bus States

The CAN bus has two logical states during operation: recessive and dominant. See Figure 6-3 and Figure 6-4.

Recessive bus state is when the high resistive internal input resistors of each node receiver bias the bus to a common mode of about 1.85V across the bus termination resistors. Recessive is equivalent to logic high and is typically a differential voltage on the bus of about 0V. Recessive state is also the idle state.

Dominant bus state is when the bus is driven differentially by one or more drivers. Current is induced to flow through the termination resistors and generate a differential voltage on the bus. Dominant is equivalent to logic low and is a differential voltage on the bus greater than the minimum threshold for a CAN dominant. A dominant state overwrites the recessive state.

During arbitration, multiple CAN nodes may transmit a dominant bit at the same time. In this case, the differential voltage of the bus is greater than the differential voltage of a single driver.

The host microprocessor of the CAN node uses the TXD terminal to drive the bus, and receives data from the bus on the RXD pin.

Transceivers with low power Standby Mode have a third bus state where the bus terminals are weakly biased to ground via the high resistance internal resistors of the receiver. See Figure 6-3 and Figure 6-4.

TCAN330 TCAN332 TCAN334 TCAN337 TCAN330G TCAN332G TCAN334G TCAN337G Bus
States (Physical Bit Representation)

Figure 6-3 Bus States (Physical Bit Representation)

TCAN330 TCAN332 TCAN334 TCAN337 TCAN330G TCAN332G TCAN334G TCAN337G Simplified Recessive Common Mode Bias Unit and Receiver

A. Normal and Silent Modes

B. Standby and Shutdown Modes

Figure 6-4 Simplified Recessive Common Mode Bias Unit and Receiver

The devices have four main operating modes:

Normal mode (all devices)
Silent mode (TCAN330, TCAN337)
Standby mode with wake (TCAN334)
Shutdown mode (TCAN330, TCAN334)

Table 6-3 CAN Transceivers with Silent Mode

S	Device MODE	DRIVER	RECEIVER	RXD PIN
HIGH	Reduced Power Silent (Listen) Mode	Disabled (OFF)⁽²⁾	Enabled (ON)	Mirrors Bus State⁽¹⁾
LOW/NC	Normal Mode	Enabled (ON)	Enabled (ON)	Mirrors Bus State⁽¹⁾

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

(2) See Figure 6-3 for bus state.

Table 6-4 CAN Transceivers with Standby Mode with Wake

STB	Device MODE	DRIVER	RECEIVER	RXD Terminal
HIGH	Ultra Low Current Standby Mode	Disabled (OFF)⁽²⁾	Low Power Receiver and Bus Monitor Enabled (ON)	High (Recessive) until WUP, then filtered mirrors of Bus State ⁽¹⁾
LOW/NC	Normal Mode	Enabled (ON)	Enabled (ON)	Mirrors Bus State ⁽¹⁾

(1) Standby Mode RXD behavior: See Figure 6-5.

Table 6-5 CAN Transceivers with Shutdown Mode

SHDN	Device MODE	DRIVER	RECEIVER	RXD Terminal
HIGH	Lowest Current	Disabled (OFF)⁽²⁾	Disabled (OFF)	High (Recessive)
LOW/NC	Normal Mode	Enabled (ON)	Enabled (ON)	Mirrors Bus State ⁽¹⁾