MAX13041 Datasheet, PDF(14/21 Page) Maxim Integrated Products – ±80V Fault-Protected High-Speed CAN Transceiver with Low-Power Management and Wake-On CAN

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MAX13041 Datasheet, PDF (14/21 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

Table 2. Flag Signaling on ERR

INTERNAL FLAG

UVNOM

UVBAT

PWON

FLAG AVAILABLE ON ERR

In PWON/listen-only mode (changing from

standby, go-to-sleep command, or sleep modes)

CONDITIONS TO CLEAR FLAG

Set PWON or wake-up flags

Recovery of VBAT

Entering normal mode

Wake-Up

Wake-Up Source

In standby, go-to-sleep command, and sleep

modes (provided VI/O and VCC are present)

In normal mode (before the fourth dominant to

recessive edge on TXD, Note 10)

Entering normal mode or setting PWON or UVNOM

flag

Leaving normal mode or setting PWON flag

Bus Failure

In normal mode (after the fourth dominant to

recessive edge on TXD, Note 10)

Re-entering normal mode

Local Failure

In PWON/listen-only mode (coming from normal

mode)

Entering normal mode or whenever RXD is

dominant while TXD is recessive (and all local

failures are resolved)

Note 10: Allow for a dominant time of at least 4Âµs per dominant-recessive cycle.

CANH

CANL

DOMINANT

RECESSIVE

DOMINANT

RECESSIVE

tBUSDOM

Figure 5. Wake-On-CAN Timing

when battery voltage is first applied to VBAT. When the

PWON flag is set, UVNOM is cleared and sleep mode is

disabled. The primary function of the PWON flag is to pre-

vent the MAX13041 from entering sleep mode (and there-

by disabling external voltage regulators) before the

protocol controller establishes control through EN and

STB. The PWON flag is externally indicated as a logic-low

on ERR when the MAX13041 is placed into PWON/listen-

only mode from standby mode, go-to-sleep command

mode, or sleep mode. The PWON flag is cleared when

the MAX13041 enters normal mode.

Wake-Up Flag

The wake-up flag is set when a local or remote wake-up

request is detected. A local wake-up request is gener-

ated when the logic level on WAKE changes and

remains stable for tWAKE. A remote wake-on CAN

request is generated upon the detection of two domi-

nant bus cycles, each followed by a recessive bus

cycle (see Figure 5.) Each bus cycle must exceed

tBUS(DOM). The wake-up flag can only be set in stand-

by mode, go-to-sleep command mode, or sleep mode.

Setting the wake-up flag resets UVNOM, and wake-up

requests are not detected during the UVNOM flag wait-

ing time immediately after UVNOM has been set. The

wake-up flag is immediately available as a logic-low on

ERR and RXD, provided that VI/O and VCC are both

present. The wake-up flag is cleared when the

MAX13041 enters normal mode.

Wake-Up Source Flag

The wake-up source flag is set concurrently with the

wake-up source flag when a local wake-up event is

detected. The wake-up source flag can only be set

after the PWON flag has been cleared. The flag is

cleared when the MAX13041 leaves normal mode and

during initial power-on. The wake-up source flag is

externally indicated on ERR when the MAX13041 is in

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