ZHCSL04A 数据表 | 德州仪器 TI.com.cn

ZHCSL04A March 2020 – July 2020 ISO1044

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8.4 Device Functional Modes

Table 8-2 and Table 8-3 list the driver and receiver functions. Table 8-4 lists the functional modes for the ISO1044B device.

Table 8-2 Driver Function Table

INPUT	OUTPUTS		DRIVEN BUS STATE
TXD⁽¹⁾	CANH⁽¹⁾	CANL⁽¹⁾	DRIVEN BUS STATE
L	H	L	Dominant
H	Z	Z	Recessive

(1) H = high level, L = low level, Z = common mode (recessive) bias to V_CC / 2. See Figure 8-1 and Figure 8-2 for bus state and common mode bias information.

Table 8-3 Receiver Function Table

DEVICE MODE	CAN DIFFERENTIAL INPUTS V_ID = V_CANH – V_CANL⁽³⁾	BUS STATE	RXD PIN⁽¹⁾
Normal	V_ID ≥ V_IT(MAX)	Dominant	L
	V_IT(MIN) < V_ID < V_IT(MAX)	Undefined	Undefined
	V_ID ≤ V_IT(MIN)	Recessive	H
	Open (V_ID ≈ 0 V)	Open	H

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

Table 8-4 Function Table

DRIVER⁽¹⁾				RECEIVER
INPUTS	OUTPUTS		BUS STATE	DIFFERENTIAL INPUTS V_ID = CANH–CANL⁽³⁾	OUTPUT RXD	BUS STATE
TXD	CANH	CANL	BUS STATE	DIFFERENTIAL INPUTS V_ID = CANH–CANL⁽³⁾	OUTPUT RXD	BUS STATE
L⁽²⁾	H	L	DOMINANT	V_ID ≥ V_IT(MAX)	L	DOMINANT
H	Z	Z	RECESSIVE	V_IT(MIN) < V_ID < V_IT(MAX)	Undefined	Undefined
Open	Z	Z	RECESSIVE	V_ID ≤ V_IT(MIN)	H	RECESSIVE
X if V_CC1 supply < UV_VCC1	Z	Z	RECESSIVE	Open (V_ID ≈ 0 V)	H	RECESSIVE

(1) H = high level; L = low level; X = irrelevant; Z = high impedance

(2) Logic low pulses to prevent dominant time-out.

(3) See Receiver Electrical Characteristics section for input thresholds.