MCP2551-I/SN Microchip Technology Inc., MCP2551-I/SN Datasheet - Page 5

• Manufacturer Part Number: MCP2551-I/SN
• Description: HIGH SPEED CAN TRANSCEIVER
• Manufacturer: Microchip Technology Inc.
• Type: Programmable Peripheral Interfacer

Specifications of MCP2551-I/SN

• Package Type: 8-Pin SOIC
• Voltage, Supply: 4.5-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

1.5
If the MCP2551 detects an extended low state on the
TXD input, it will disable the CANH and CANL output
drivers in order to prevent the corruption of data on the
CAN bus. The drivers are disabled if TXD is low for
more than 1.25 ms (minimum). This implies a
maximum bit time of 62.5 µs (16 kb/s bus rate),
allowing up to 20 consecutive transmitted dominant bits
during a multiple bit error and error frame scenario. The
drivers remain disabled as long as TXD remains low. A
rising edge on TXD will reset the timer logic and enable
the CANH and CANL output drivers.
1.6
When the device is powered on, CANH and CANL
remain in a high-impedance state until V
voltage-level V
remain in a high-impedance state if TXD is low when
V
active only after TXD is asserted high. Once powered
on, CANH and CANL will enter a high-impedance state
if the voltage level at V
voltage brown-out protection during normal operation.
1.7
The 8-pin pinout is listed in Table 1-3.
TABLE 1-3:
Number
DD
2003 Microchip Technology Inc.
Pin
1
2
3
4
5
6
7
8
reaches V
TXD Permanent Dominant
Detection
Power-on Reset
Pin Descriptions
CANH
Name
CANL
RXD
V
TXD
V
V
PORH
Pin
R
REF
PORH
DD
SS
S
MCP2551 PINOUT
. In addition, CANH and CANL will
. CANH and CANL will become
DD
Transmit Data Input
Ground
Supply Voltage
Receive Data Output
Reference Output Voltage
CAN Low-Level Voltage I/O
CAN High-Level Voltage I/O
Slope-Control Input
falls below V
Pin Function
PORL
DD
reaches the
, providing
1.7.1
TXD is a TTL-compatible input pin. The data on this pin
is driven out on the CANH and CANL differential output
pins. It is usually connected to the transmitter data
output of the CAN controller device. When TXD is low,
CANH and CANL are in the dominant state. When TXD
is high, CANH and CANL are in the recessive state,
provided that another CAN node is not driving the CAN
bus with a dominant state. TXD has an internal pull-up
resistor (nominal 25 k to V
1.7.2
Ground supply pin.
1.7.3
Positive supply voltage pin.
1.7.4
RXD is a CMOS-compatible output that drives high or
low depending on the differential signals on the CANH
and CANL pins and is usually connected to the receiver
data input of the CAN controller device. RXD is high
when the CAN bus is recessive and low in the dominant
state.
1.7.5
Reference Voltage Output (Defined as V
1.7.6
The CANL output drives the low side of the CAN
differential bus. This pin is also tied internally to the
receive input comparator.
1.7.7
The CANH output drives the high-side of the CAN
differential bus. This pin is also tied internally to the
receive input comparator.
1.7.8
The R
or Standby modes via an external biasing resistor.
S
pin is used to select High-speed, Slope-control
TRANSMITTER DATA INPUT (TXD)
GROUND SUPPLY (V
SUPPLY VOLTAGE (V
RECEIVER DATA OUTPUT (RXD)
REFERENCE VOLTAGE (V
CAN LOW (CANL)
CAN HIGH (CANH)
SLOPE RESISTOR INPUT (R
DD
MCP2551
).
SS
DD
DS21667D-page 5
)
)
DD
REF
/2).
S
)
)