MAX3054ASD Maxim Integrated Products, MAX3054ASD Datasheet - Page 16

• Manufacturer Part Number: MAX3054ASD
• Description: Network Controller & Processor ICs +/-80V, 250kbps Faul t-Protected - Fault
• Manufacturer: Maxim Integrated Products

Specifications of MAX3054ASD

• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 250 Kbps
• Supply Voltage (max): 5.25 V, 42 V
• Supply Voltage (min): 4.75 V, 5 V
• Supply Current (max): 0.125 mA, 30 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-14

The transceiver provides three low-power modes that can
be entered or exited through pins STB and EN (Table 3).
The sleep mode is the mode with the lowest power con-
sumption. INH is switched to high impedance for deacti-
vation of the external voltage regulator. CANL is biased
to the battery voltage through RTL. If the supply voltage
is provided, RXD and ERR signal the wake-up interrupt.
The standby mode reacts the same as the sleep mode,
but with a HIGH level on INH. Standby mode can be
used when the external voltage regulator needs to be
kept active during low-power operation.
The power-on standby mode behaves similarly to the
standby mode with the battery power-on flag of the
wake-up interrupt signal on ERR. This mode is only for
reading the power-on flag. INH can be high or low in
the power-on standby mode. When the device goes
from standby mode to power-on standby mode, INH is
HIGH. When the device goes from sleep mode to
power-on standby mode, INH is low.
Wake-up requests are recognized by the transceiver
when a dominant signal is detected on either bus line
or if WAKE detects a pulse for more than 38µs. On a
wake-up request, INH is set high to activate an external
voltage regulator.
If V
the ERR or RXD outputs.
±80V Fault-Protected/Tolerant CAN
Transceivers for In-Car Applications
Table 3. Low-Power Modes
16
Note 1: In case the go-to-sleep command was used before.
Note 2: If the supply voltage V
Note 3: Wake-up interrupts are released when entering the normal operating mode.
Go-to-Sleep
Command
Sleep
Standby
Power-On
Standby
Normal
Operating
CC
MODE
______________________________________________________________________________________
is provided, the wake-up request can be read on
STB
0
0
0
1
1
0 (Note 1)
CC
EN
1
0
0
1
Power-On Standby Mode
is present.
Low-Power Modes
V
(Notes 2 and 3)
interrupt signal
BATT
Error flag
Wake-up
Standby Mode
LOW
flag
power-on
Sleep Mode
Wake-Up
ERR
No error flag
HIGH
—
—
To prevent false wake-up due to transients or RF fields,
the wake-up voltage levels have to be maintained for more
than 38µs. In the low-power modes, the failure detection
circuit remains partly active to prevent increased power
consumption in the event of failures 3, 4, 7, and 8.
The MAX3054/MAX3055/MAX3056 are capable of sus-
taining a network of up to 32 transceivers on a single
bus. The fault-tolerant transceivers are designed to
operate at a total termination resistance of 100Ω. Both
CANH and CANL lines are terminated with 100Ω. Since
the total termination resistance of the system is distrib-
uted over the entire bus, each of the transceivers con-
tributes only part of the total 100Ω termination. The
values of the termination resistors RTL and RTH vary
according to the size of the system and need to be cal-
culated. It is not required that each transceiver be ter-
minated with the same value, the total termination need
only be a total 100Ω.
The minimum termination resistor value allowed for
each transceiver is 500Ω, due to the driving capability
of RTH and RTL. This makes it impossible to achieve a
total termination resistance of 100Ω for systems smaller
than five transceivers. Typically this does not create a
problem because smaller systems usually have shorter
bus cables and have no problem with higher total ter-
mination resistance.
To reduce EMI in the case of an interrupted bus wire it
is recommended not to exceed 6kΩ termination resis-
tance at a single transceiver even though a higher
value is specified.
(Notes 2 and 3)
(Notes 2 and 3)
interrupt signal
interrupt signal
received data
Dominant
Wake-up
Wake-up
LOW
Applications Information
RXD
received data
Recessive
HIGH
—
—
SWITCHED TO
V
V
RTL
V
BATT
BATT
CC