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MCP2551 Datasheet

  • MCP2551

  • LAN Transceiver

  • 349.21KB

  • Microchip   Microchip

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MCP2551
1.5
TXD Permanent Dominant
Detection
1.7.2
GROUND SUPPLY (V
SS
)
Ground supply pin.
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 maxi-
mum bit time of 62.5 碌s (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.
1.7.3
SUPPLY VOLTAGE (V
DD
)
Positive supply voltage pin.
1.7.4
RECEIVER DATA OUTPUT (RXD)
RXD is a CMOS-compatible output that drives high or
low depending upon 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.
1.6
Power-on Reset
1.7.5
REFERENCE VOLTAGE (V
REF
)
When the device is powered on, CANH and CANL
remain in a high-impedance state until V
DD
reaches the
voltage level V
PORH
. In addition, CANH and CANL will
remain in a high-impedance state if TXD is low when
V
DD
reaches V
PORH
. CANH and CANL will become
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
DD
falls below V
PORL
, providing
voltage brown-out protection during normal operation.
Reference Voltage Output (Defined as V
DD
/2).
1.7.6
CAN LOW (CANL)
The CANL output drives the low side of the CAN differ-
ential bus. This pin is also tied internally to the receive
input comparator.
1.7.7
CAN HIGH (CANH)
1.7
Pin Descriptions
The 8-pin pinout is listed in Table 1-3.
The CANH output drives the high side of the CAN dif-
ferential bus. This pin is also tied internally to the
receive input comparator.
TABLE 1-3:
Pin
Number
1
2
3
4
5
6
7
8
MCP2551 PINOUT
Pin
Name
TXD
V
SS
V
DD
RXD
V
REF
CANL
CANH
R
S
Ground
Supply Voltage
Receive Data Output
Reference Output Voltage
CAN Low-Level Voltage I/O
CAN High-Level Voltage I/O
Slope-Control Input
Pin Function
Transmit Data Input
1.7.8
SLOPE RESISTOR INPUT (R
S
)
The R
S
pin is used to select High-Speed, Slope-Control
or Standby modes via an external biasing resistor.
1.7.1
TRANSMITTER DATA INPUT (TXD)
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 out-
put 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鈩?to V
DD
).
錚?/div>
2002 Microchip Technology Inc.
Preliminary
DS21667C-page 5

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