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| 型號(hào)： | MAX3072E |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | +3.3V.±.15kV ESD-Protected.Fail-Safe.Hot-Swap.RS-485/RS-422 Transceivers |
| 中文描述： | +3.3V、±15kV ESD保護(hù)、失效保護(hù)、熱插拔、RS-485/RS-422收發(fā)器 |
| 文件頁(yè)數(shù)： | 16/18頁(yè) |
| 文件大?。?/td> | 503K |
| 代理商： | MAX3072E |
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Low-Power Modes
The transceiver provides three low-power modes that can
be entered or exited through pins
STB
and EN (Table 3).
Sleep Mode
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.
Standby Mode
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.
Power-On Standby Mode
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
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
CC
is provided, the wake-up request can be read on
the
ERR
or RXD outputs.
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.
Applications Information
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 100
. Both
CANH and CANL lines are terminated with 100
. 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 100
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 100
.
The minimum termination resistor value allowed for
each transceiver is 500
, due to the driving capability
of RTH and RTL. This makes it impossible to achieve a
total termination resistance of 100
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 6k
termination resis-
tance at a single transceiver even though a higher
value is specified.
M
±80V Fault-Protected/Tolerant CAN
Transceivers for In-Car Applications
16
______________________________________________________________________________________
Note 1:
In case the go-to-sleep command was used before.
Note 2:
If the supply voltage V
CC
is present.
Note 3:
Wake-up interrupts are released when entering the normal operating mode.
ERR
RXD
MODE
STB
EN
LOW
HIGH
LOW
HIGH
RTL
SWITCHED TO
Go-to-Sleep
Command
0
1
Sleep
Standby
0
0
0 (Note 1)
0
Wake-up
interrupt signal
(Notes 2 and 3)
—
Wake-up
interrupt signal
(Notes 2 and 3)
—
V
BATT
Power-On
Standby
1
0
V
BATT
power-on
flag
—
Wake-up
interrupt signal
(Notes 2 and 3)
—
V
BATT
Normal
Operating
1
1
Error flag
No error flag
Dominant
received data
Recessive
received data
V
CC
Table 3. Low-Power Modes
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3072EAPA | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3072EAPA+ | 功能描述:RS-422/RS-485 接口 IC 3.3V Fl-Sfe/Ht-Swp RS-485/RS-422 Tcvr RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3072EASA | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3072EASA+ | 功能描述:RS-422/RS-485 接口 IC 3.3V Fl-Sfe/Ht-Swp RS-485/RS-422 Tcvr RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3072EASA+T | 功能描述:RS-422/RS-485 接口 IC 3.3V Fl-Sfe/Ht-Swp RS-485/RS-422 Tcvr RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
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