MCP2551-I/SN Microchip Technology, MCP2551-I/SN Datasheet - Page 3

• Manufacturer Part Number: MCP2551-I/SN
• Description: IC TRANSCEIVER CAN HI-SPD 8-SOIC
• Manufacturer: Microchip Technology
• Type: Transceiverr

Specifications of MCP2551-I/SN

• Package / Case: 8-SOIC (3.9mm Width)
• Number Of Drivers/receivers: 1/1
• Protocol: CAN
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Product: Controller Area Network (CAN)
• Number Of Transceivers: 1
• Data Rate: 1 Mbps
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Supply Current (max): 75 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Slew Rate: 8.5V/µs
• Supply Voltage Range: 4.5V To 5.5V
• Logic Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Interface: CAN
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Data Rate Max: 1Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP2515DM-BM - BOARD DEMO FOR MCP2515/51MCP2515DM-PTPLS - BOARD DAUGHTER PICTAIL MCP2515AC164130 - BOARD DAUGHT PICTL PLUS ECAN/LIN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

1.0
The MCP2551 is a high-speed CAN, fault-tolerant
device that serves as the interface between a CAN
protocol controller and the physical bus. The MCP2551
provides differential transmit and receive capability for
the CAN protocol controller and is fully compatible with
the ISO-11898 standard, including 24V requirements. It
will operate at speeds of up to 1 Mb/s.
Typically, each node in a CAN system must have a
device to convert the digital signals generated by a
CAN controller to signals suitable for transmission over
the bus cabling (differential output). It also provides a
buffer between the CAN controller and the high-voltage
spikes that can be generated on the CAN bus by
outside sources (EMI, ESD, electrical transients, etc.).
1.1
The CAN bus has two states: Dominant and
Recessive. A dominant state occurs when the
differential voltage between CANH and CANL is
greater than a defined voltage (e.g.,1.2V). A recessive
state occurs when the differential voltage is less than a
defined voltage (typically 0V). The dominant and
recessive states correspond to the low and high state
of the TXD input pin, respectively. However, a dominant
state initiated by another CAN node will override a
recessive state on the CAN bus.
1.1.1
The MCP2551 CAN outputs will drive a minimum load
of 45
connected
resistance of 20 k
value of 120
1.2
The RXD output pin reflects the differential bus voltage
between CANH and CANL. The low and high states of
the RXD output pin correspond to the dominant and
recessive states of the CAN bus, respectively.
1.3
CANH and CANL are protected against battery short-
circuits and electrical transients that can occur on the
CAN bus. This feature prevents destruction of the
transmitter output stage during such a fault condition.
The device is further protected from excessive current
loading by thermal shutdown circuitry that disables the
output drivers when the junction temperature exceeds
a nominal limit of 165°C. All other parts of the chip
remain operational and the chip temperature is lowered
due to the decreased power dissipation in the
transmitter outputs. This protection is essential to
protect against bus line short-circuit-induced damage.
2003 Microchip Technology Inc.
,
DEVICE OVERVIEW
Transmitter Function
Receiver Function
Internal Protection
allowing a maximum of 112 nodes to be
MAXIMUM NUMBER OF NODES
(given
and a nominal termination resistor
a
minimum
differential
input
1.4
The R
selected:
• High-Speed
• Slope-Control
• Standby
These modes are summarized in Table 1-1.
When in High-speed or Slope-control mode, the drivers
for the CANH and CANL signals are internally regu-
lated to provide controlled symmetry in order to mini-
mize EMI emissions.
Additionally, the slope of the signal transitions on
CANH and CANL can be controlled with a resistor
connected from pin 8 (R
proportional to the current output at R
reducing EMI emissions.
1.4.1
High-speed mode is selected by connecting the R
to V
fast output rise and fall times to support high-speed
CAN bus rates.
1.4.2
Slope-control mode further reduces EMI by limiting the
rise and fall times of CANH and CANL. The slope, or
slew rate (SR), is controlled by connecting an external
resistor (R
The slope is proportional to the current output at the R
pin. Since the current is primarily determined by the
slope-control resistance value R
is achieved by applying a respective resistance.
Figure 1-1 illustrates typical slew rate values as a
function of the slope-control resistance value.
1.4.3
The device may be placed in standby or “SLEEP” mode
by applying a high-level to R
transmitter is switched off and the receiver operates at
a lower current. The receive pin on the controller side
(RXD) is still functional but will operate at a slower rate.
The attached microcontroller can monitor RXD for CAN
bus activity and place the transceiver into normal
operation via the R
CAN message may be lost).
SS
. In this mode, the transmitter output drivers have
S
Operating Modes
pin allows three modes of operation to be
EXT
HIGH-SPEED
SLOPE-CONTROL
STANDBY MODE
) between R
S
pin (at higher bus rates, the first
S
S
) to ground, with the slope
and V
MCP2551
S
. In SLEEP mode, the
EXT
OL
, a certain slew rate
(usually ground).
DS21667D-page 3
S
, further
S
pin
S