MAX13041_08 Datasheet, PDF(13/20 Page) Maxim Integrated Products – ±80V Fault-Protected High-Speed CAN Transceiver with Low-Power Management and Wake-On CAN

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MAX13041_08 Datasheet, PDF (13/20 Pages) Maxim Integrated Products – ±80V Fault-Protected High-Speed CAN Transceiver with Low-Power Management and Wake-On CAN

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Â±80V Fault-Protected High-Speed CAN Transceiver

with Low-Power Management and Wake-On CAN

PWON/LISTEN-ONLY MODE

STB = H AND EN = H

STB = H AND EN = L

NORMAL MODE

STB = H

AND EN = L

STB = L

AND

(EN = L OR

FLAG SET)

STB = H

AND EN = L

STB = L

AND EN = L

STB = H

AND EN = H

STB = H

AND EN = H

STB = L AND EN = H

AND FLAGS CLEARED

STB = L

AND EN = H

STANDBY MODE

STB = L AND EN = H

AND FLAGS CLEARED

GO-TO-SLEEP COMMAND MODE

STB = H AND EN = L

AND UVNOM CLEARED

STB = L AND

FLAG SET

STB = L AND

(EN = L OR FLAG SET)

FLAGS CLEARED

AND t > tH(MIN)

STB = H AND EN = H

AND UVNOM CLEARED

SLEEP MODE

NOTES: H AND L ARE

FLAG SET =

FLAGS CLEARED

LOGIC STATE OF EN OR STB

SETTING PWON AND/OR WAKE-UP FLAG.

PWON AND WAKE-UP FLAG BOTH CLEARED.

Figure 4. State Diagram

activity. To reduce power consumption, common-mode

stabilization is disabled. SPLIT becomes high imped-

ance, and CANH and CANL are biased to ground by

the termination resistors. INH goes high impedance,

disabling one or more external voltage regulators (see

Table 1.)

Flag Signaling

The MAX13041 uses a set of seven internal flags for

system diagnosis and to indicate faults. Five of the

flags are available at different times to the CAN proto-

col controller on ERR. A logic-low on ERR indicates a

set flag or a fault (see Table 3.) Allow ERR to stabilize

for at least 8Âµs after changing operating modes.

Supply Undervoltage: UVNOM

UVNOM is set when supply voltage on VCC drops below

VCC(SLEEP) for longer than tUV(Vcc), or when voltage on

VI/O drops below VI/O(SLEEP) for longer than tUV(VI/O).

When UVNOM is set, the MAX13041 enters low-power

sleep mode to reduce power consumption. The device

remains in sleep mode for a minimum waiting time

before allowing the UVNOM flag to be cleared. This

waiting time is determined by the same timer used for

setting UVNOM (tUV(VCC) or tUV(VIO).) UVNOM is cleared

by a local wake-up request triggered by a level change

on WAKE or by a wake-on-CAN event. UVNOM is also

cleared by setting the PWON flag.

VBAT Undervoltage: UVBAT

UVBAT is set when the voltage on VBAT drops below

VBAT(STB). When UVBAT is set, the MAX13041 enters

standby mode to reduce power consumption. UVBAT is

cleared when the voltage on VBAT is restored and

exceeds VBAT(STB). Upon clearing UVBAT, the

MAX13041 returns to the operating mode determined

by EN and STB.

Power-On Flag: PWON

PWON indicates the MAX13041 is in a power-on state.

PWON is set when VBAT has dropped below VBAT(STB)

and has subsequently recovered. This condition occurs

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