amis-30523 ON Semiconductor, amis-30523 Datasheet - Page 34

• Manufacturer Part Number: amis-30523
• Description: Amis-30523 Product Preview Can Micro-stepping Motor Driver
• Manufacturer: ON Semiconductor

Introduction
protocol controller and the physical bus. It provides
differential transmit capability to the bus and differential
receive capability to the CAN controller. Due to the wide
common−mode voltage range of the receiver inputs, it is
able to reach outstanding levels of electro−magnetic
susceptibility
electromagnetic emission (EME) is achieved by the
excellent matching of the output signals.
the supply voltage is removed; a wake−up over bus and the
extreme low current in stand−by mode.
needs to be low. The integrated transceiver allows low
transmit data rates down 10 kbit/s or lower.
Operating Modes
illustrated in Table 19. These modes are selectable through
pin STB
communicate via the bus lines. The signals are transmitted
and received to the CAN controller via the pins TxD and
RxD. The slopes on the bus lines outputs are optimized to
give extremely low EME.
disabled and a very low−power differential receiver
monitors the bus lines for CAN bus activity. The bus lines
are terminated to ground and supply current is reduced to a
minimum, typically 10 mA. When a wake−up request is
detected by the low−power differential receiver, the signal
is first filtered and then verified as a valid wake signal after
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
DEVICE ORDERING INFORMATION
Specifications Brochure, BRD8011/D.
Table 19. OPERATING MODES
AMIS30523C5231RG
AMIS30523C5231G
The CAN transceiver is the interface between a (CAN)
Additional features are the ideal passive behavior when
To cope with the long bus delay the communication speed
The CAN transceiver provides two modes of operation as
In the normal mode, the transceiver is able to
In stand−by mode both the transmitter and receiver are
Standby
Normal
Mode
Part Number
(EMS).
STB
High
Low
Similarly,
FUNCTIONAL DESCRIPTION CAN TRANSCEIVER
dominant
Wake−up
detected
request
Low
Bus
−40°C – 125°C
−40°C – 125°C
Temperature
Range
extremely
RXD
recessive
wake−up
detected
request
High
Bus
No
http://onsemi.com
low
1600 mA
1600 mA
Current
Peak
34
a time period of t
transceiver to inform the controller of the wake−up request.
Split Circuit
standby mode this pin is floating. The V
as shown in Figure 13 and its purpose is to provide a
stabilized DC voltage of 0.5 x V
possible steps in the common−mode signal therefore
reducing EME. These unwanted steps could be caused by an
un−powered node on the network with excessive leakage
current from the bus that shifts the recessive voltage from its
nominal 0.5 x V
Wake−up
has been received during the standby mode the RxD pin is
driven low
Over−Temperature Detection
by switching off the transmitter if the junction temperature
exceeds a value of approximately 160°C. Because the
transmitter dissipates most of the power, the power
dissipation and temperature of the IC is reduced. All other
IC functions continue to operate. The transmitter off−state
resets when pin TxD goes high. The thermal protection
circuit is particularly needed when a bus line short circuits.
High Communication Speed Range
applications. It allows very low baud rates needed for long
bus length applications. But also high speed communication
is possible up to 1 Mbit/s.
Fail Safe Features
stage from damage caused by accidental short circuit to
either positive or negative supply voltage, although power
dissipation increases during this fault condition.
automotive electrical transients (according to ISO 7637; see
Figure 7). Pins TxD and STB are pulled high internally
should the input become disconnected. Pins TxD, STB and
RxD will be floating, preventing reverse supply should the
V
CC
The VSPLIT pin is operational only in normal mode. In
Once a valid wake−up (dominant state longer than t
A thermal protection circuit protects the IC from damage
The transceiver is primarily intended for industrial
A current−limiting circuit protects the transmitter output
The pins CANH and CANL are protected from
supply be removed.
Package Type
(Pb−Free)
(Pb−Free)
QFN−52
QFN−52
CC
BUS
voltage.
, the RxD pin is driven low by the
CC
Tape & Reel
to the bus avoiding
Shipping
SPLIT
Tube
is connected
†
BUS
)