參數(shù)資料
型號： MAX3053ASA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 網(wǎng)絡接口
英文描述： 【80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver
中文描述： DATACOM, INTERFACE CIRCUIT, PDSO8
封裝： SOIC-8
文件頁數(shù)： 9/11頁
文件大?。?/td> 317K
代理商： MAX3053ASA
M
±80V Fault-Protected, 2Mbps,
Low Supply Current CAN Transceiver
_______________________________________________________________________________________
9
Slope Control
Connect a resistor from RS to ground to select slope con-
trol mode (see Table 2). In slope control mode, the gates
of the line drivers are charged with a controlled current,
proportional to the resistor connected to the RS pin.
Transmission speed ranges from 40kbps to 500kbps.
Controlling the rise and fall slope reduces EMI and allows
the use of an unshielded twisted pair or a parallel pair of
wires as bus lines. The transfer function for selecting the
resistor value is given by:
R
RS
(k
) = 12000 / speed (in kbps).
See the
Typical Operating Characteristics
for the Slew
Rate vs. R
RS
graph.
Shutdown
To place the MAX3053 in shutdown, the
SHDN
pin
should be driven to GND. In shutdown mode, the
device is switched off. The outputs are high impedance
to
±
80V.
Receiver
The receiver takes differential input from the bus lines
(CANH, CANL) and converts this data to a single-
ended output (RXD) to the CAN controller. It consists of
a comparator that senses the difference
V = (CANH -
CANL) with respect to an internal threshold of 0.7V. If
this difference is positive (i.e.,
V > 0.9V), a logic low is
present at the RXD pin. If negative (i.e.,
V < 0.5V), a
logic high is present.
The receiver always echoes the transmitted data.
The CANH and CANL common-mode range is from -7V
to +12V. RXD is logic high when CANH and CANL are
shorted or terminated and undriven.
Thermal Shutdown
If the junction temperature exceeds +160
°
C, the device
is switched off. The hysteresis is about 20
°
C, disabling
thermal shutdown once the temperature declines to
+140
°
C and the device is turned back on.
Autoshutdown
To manage power consumption, autoshutdown puts the
device into shutdown mode after the device has been
inactive for a period of time. The value of an external
capacitor (C
SHDN
) connected to
SHDN
determines the
threshold of inactivity time, after which the autoshutdown
triggers (see
Typical Operating Characteristics
).
Use a 100nF capacitor as C
SHDN
for a typical threshold
of 20ms. Change the capacitor value according to the
following equation to change the threshold time period:
Drive
SHDN
high to force the MAX3053 on and disable
autoshutdown.
When the MAX3053 is in shutdown mode, only the
wakeup comparator is active, and normal bus commu-
nication is ignored. The remote master of the CAN sys-
tem wakes up the MAX3053 with a signal greater than
9V on CANH. The local CAN controller wakes up the
MAX3053 by driving
SHDN
high or TXD.
Driver Output Protection
The MAX3053 has several features to protect itself from
damage. Thermal shutdown switches off the device
and puts CANH and CANL into high impedance if the
junction temperature exceeds +160
°
C. Thermal protec-
tion is needed particularly when a bus line is short cir-
cuited. The hysteresis for the thermal shutdown is
about 20
°
C.
C
I
A
V
time ms
V
SHDN
nf
(
SHDN
)
SHDN
(V
)
)
(
(
)
(
=
μ
×
)
CC
TXD
0
1 or float
X*
SHDN
CANH
HIGH
CANL
LOW
BUS STATE
Dominant**
Recessive**
Floating
RXD
0
1
1
V
SHDN
> 1.5V
V
SHDN
> 1.5V
V
SHDN
< 0.5V
5
to 25k
to V
cc
/2
Floating
5
to 25k
to V
cc
/2
Floating
CONDITION
FORCED AT PIN RS
MODE
RESULTING
CURRENT AT RS
V
RS
< 0.3V
CC
0.4V
CC
< V
RS
<
0.6V
CC
High speed
|I
Rs
| < 500μA
Slope control
10μA < |I
Rs
| < 200μA
Table 1. Transmitter and Receiver Truth Table
Table 2. Mode Selection Truth Table
*
X = Don
’
t care.
**
As defined by ISO, bus value is one of two complementary logical values: dominant or recessive. The dominant value represents
the logical 0 and the recessive represents the logical 1. During the simultaneous transmission of the dominant and recessive bits, the
resulting bus value is dominant.
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相關代理商/技術參數(shù)
參數(shù)描述
MAX3053ASA+ 功能描述:網(wǎng)絡控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
MAX3053ASA+T 功能描述:網(wǎng)絡控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
MAX3053ASA-T 功能描述:網(wǎng)絡控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
MAX3053ESA 制造商:Maxim Integrated Products 功能描述:+/-80V FAULT-PROTECTED, 2MBPS, LOW-SUPPLY CUR - Rail/Tube
MAX3053ESA+ 功能描述:CAN 接口集成電路 80V Fault-Protected 2Mbps RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube
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