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| 型号： | EVAL-ADM3054EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ADM3054 |
| 特色产品： | Isolated CAN Transcievers |
| 标准包装： | 1 |
| 主要目的： | 接口，CAN 控制器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | * |
| 次要属性： | 短路和热保护 |
| 已供物品： | 板 |
Data Sheet
ADM3054
Rev. B | Page 15 of 20
THEORY OF OPERATION
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 imped-
ance state.
The driver drives CANH high and CANL low (dominant state)
when a logic low is present on TxD. If a logic high is present on
TxD, the driver outputs are placed in a high impedance state
(recessive state). The driver output states are presented in Table 9.
The receiver output is low when the bus is in the dominant state
and high when 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 can be
either high or low. The receiver output states for given inputs
are listed in Table 10.
THERMAL SHUTDOWN
The ADM3054 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. This circuitry is designed to disable the driver
outputs when a junction temperature of 150°C is reached. As
the device cools, the drivers reenable at a temperature of 140°C.
TRUTH TABLES
The truth tables in this section use the abbreviations listed
Table 8. Truth Table Abbreviations
Letter
Description
H
High level
L
Low level
I
Indeterminate
X
Don’t care
Z
High impedance (off)
NC
Disconnected
Table 9. Transmitting
Supply Status
Input
Outputs
VDD1
VDD2
TxD
State
CANH
CANL
VDD2SENSE
On
L
Dominant
H
L
On
H
Recessive
Z
L
On
Floating
Recessive
Z
L
Off
On
X
Recessive
Z
I
On
Off
L
I
H
Table 10. Receiving
Supply Status
Inputs
Outputs
VDD1
VDD2
VID = CANH CANL
Bus State
RxD
VDD2SENSE
On
≥0.9 V
Dominant
L
On
≤0.5 V
Recessive
H
L
On
0.5 V < VID < 0.9 V
I
L
On
Inputs open
Recessive
H
L
Off
On
X
I
On
Off
X
H
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