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ZHCSH93 December 2017 TCAN4420

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8.4.4 Driver and Receiver Function

The digital logic input and output levels for these devices are TTL levels with respect to V_IO for compatibility with protocol controllers having 2.8 V to 5 V logic or I/O.

Table 3 and Table 4 provide the states of the CAN driver and CAN receiver in each mode.

Table 3. Driver Function Table

DEVICE MODE	TXD INPUT⁽¹⁾	BUS OUTPUTS⁽²⁾		DRIVEN BUS STATE⁽³⁾
DEVICE MODE	TXD INPUT⁽¹⁾	CANH	CANL	DRIVEN BUS STATE⁽³⁾
Normal	L	H	L	Dominant
Normal	H or Open	Z	Z	Biased Recessive
Reverse	L	L	H	Dominant
Reverse	H or Open	Z	Z	Biased Recessive

(1) H = high level, L = low level

(2) H = high level, L = low level, Z = high Z receiver bias

(3) For Bus state and bias see Figure 7

Table 4. Receiver Function Table

DEVICE MODE	CAN DIFFERENTIAL INPUTS V_ID = V_CANH – V_CANL	BUS STATE	RXD TERMINAL⁽¹⁾
Normal: V_ID = V_CANH – V_CANL Reverse: V_ID = V_CANL – V_CANH	V_ID ≥ 0.9 V	Dominant	L
	0.5 V < V_ID< 0.9 V	Undefined	Undefined
	V_ID ≤ 0.5 V	Recessive	H

(1) H = high level, L = low level