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ZHCSI90E December 2017 – October 2019 ISO1042

PRODUCTION DATA.

8.4 Device Functional Modes

Table 3 and Table 4 list the driver and receiver functions. Table 5 lists the functional modes for the ISO1042 device.

Table 3. 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 25 and Figure 26 for bus state and common mode bias information.

Table 4. 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)	?	?
	V_ID ≤ V_IT(MIN)	Recessive	H
	Open (V_ID ≈ 0 V)	Open	H

(1) H = high level, L = low level, ? = indeterminate.

Table 5. Function Table⁽¹⁾

DRIVER				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)	?	?
Open	Z	Z	RECESSIVE	V_ID ≤ V_IT(MIN)	H	RECESSIVE
X	Z	Z	RECESSIVE	Open (V_ID ≈ 0 V)	H	RECESSIVE

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

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

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

8.4 Device Functional Modes

Table 3. Driver Function Table

Table 4. Receiver Function Table

Table 5. Function Table(1)

Table 5. Function Table⁽¹⁾