參數(shù)資料
型號(hào)： EVAL-ADM3051EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 5/16頁(yè)
文件大小： 0K
描述： EVAL BOARD FOR ADM3051
特色產(chǎn)品： Isolated CAN Transcievers
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，CAN 控制器
嵌入式： 否
已用 IC / 零件： *
次要屬性： 短路和熱保護(hù)
已供物品： 板
Data Sheet
ADM3051
Rev. 0 | Page 13 of 16
CIRCUIT DESCRIPTION
CAN TRANSCEIVER OPERATION
A CAN bus has two states: dominant and recessive. A dominant
state is present on the bus when the differential voltage between
CANH and CANL is greater than 0.9 V. A recessive state is
present on the bus when the differential voltage between CANH
and CANL is less than 0.5 V. During a dominant bus state, the
CANH pin is high and the CANL pin is low. During a recessive
bus state, both the CANH and CANL pins are in the high
impedance state.
The driver drives CANH high and CANL low (dominant state)
if a logic low is present on TxD. If a logic high is present on
TxD, the driver output is placed in a high impedance state
(recessive state). The driver output states are shown in Table 7.
The receiver output is low if the bus is in the dominant state and
high if the bus is in the recessive state. If the differential voltage
between CANH and CANL is between 0.5 V and 0.9 V, the bus
state is indeterminate and the receiver output may be high or
low. The receiver output states for given inputs are listed in
OPERATIONAL MODES
Three modes of operation are available: high speed, slope
control, and standby. RS (Pin 8) allows modification of the
operational mode by connecting the RS input through a resistor
to ground, or directly to ground, or to a CAN controller, as
shown in Figure 30.
With RS connected to ground, the output transistors switch on
and off at the maximum rate possible in high speed mode, with
no modification to the rise and fall slopes. EMI in this mode
can be alleviated using shielded cables.
Alternatively, connecting RS to a resistor, RSLOPE, allows
slope control mode, with the value of the resistor modifying
the rise and fall slopes. The reduced EMI allows the use of
unshielded cables.
Applying a logic high to RS initiates a low current standby mode.
The transmitter is disabled, and the receiver is connected to a
low current. RxD goes low upon receiving dominant bits, allowing
an attached microcontroller that detects this to wake the
transceiver via Pin 8, which returns it to standard operation.
The receiver is slower in standby mode and loses the first
message at higher bit rates.
Table 5. Mode Selection Using RS Pin (Pin 8)
Mode
Condition to Force
Resulting
Voltage/Current
Standby
VRS > 0.75 VCC
IRS < 10 μA
Slope Control
10 μA < IRS < 200 μA
0.4 VCC < VRS < 0.6 VCC
High Speed
VRS < 0.3 VCC
IRS < 500 μA
TRUTH TABLES
The truth tables in this section use the abbreviations found in
Table 6. Truth Table Abbreviations
Letter
Description
H
High level
L
Low level
X
Don’t care
I
Indeterminate
Z
High impedance (off )
NC
Disconnected
Table 7. Transmitting
Supply
Input
Outputs
VCC
TxD
State
CANH
CANL
On
L
Dominant
H
L
On
H
Recessive
Z
On
Z
Recessive
Z
Off
X
Z
Table 8. Receiving
Supply
Inputs
Output
VCC
VID = CANH CANL
Bus State
RxD
On
≥0.9 V
Dominant
L
On
≤0.5 V
Recessive
H
On
0.5 V < VID < 0.9 V
I
On
Inputs open
Recessive
H
Off
X
I
THERMAL SHUTDOWN
The ADM3051 contains thermal shutdown circuitry that
protects the part from excessive power dissipation during fault
conditions. Shorting the driver outputs to a low impedance
source can result in high driver currents. The thermal sensing
circuitry detects the increase in die temperature under this
condition and disables the driver outputs. The design of this
circuitry ensures the disabling of driver outputs upon reaching
a die temperature of 150°C. As the device cools, reenabling of
the drivers occurs at a temperature of 140°C.
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