MCP25055-I/P Microchip Technology, MCP25055-I/P Datasheet - Page 7

• Manufacturer Part Number: MCP25055-I/P
• Description: IC I/O EXPANDER CAN 8B 14DIP
• Manufacturer: Microchip Technology

Specifications of MCP25055-I/P

• Mounting Type: Through Hole
• Interface: 1-Wire, CAN
• Number Of I /o: 8
• Interrupt Output: No
• Frequency - Clock: 4MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 14-DIP (0.300", 7.62mm)
• Includes: ADC, Memory, PWM
• Bus Frequency: 4MHz
• No. Of I/o's: 8
• Supply Voltage Range: 2.7V To 5.5V
• Digital Ic Case Style: DIP
• No. Of Pins: 14
• Operating Temperature Range: -40°C To +85°C
• Data Rate Max: 1Mbps
• Leaded Process Compatible: Yes
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DV250501 - KIT DEV CAN MCP250XX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: MCP25055I/P

REGISTER 2-1:
REGISTER 2-2:
FIGURE 2-3:
2.4
The Bit Timing Logic (BTL) monitors the bus line input
and handles the bus-related bit timing based on the
CAN protocol. The BTL synchronizes on a recessive-
to-dominant bus transition at Start-of-Frame (hard
synchronization) and on any further recessive-to-
dominant bus line transition if the CAN controller itself
does not transmit a dominant bit (resynchronization).
The BTL also provides programmable time segments
to compensate for the propagation delay time, phase
shifts and to define the position of the sample point
within the bit time. These programmable segments are
made up of integer units called Time Quanta (T
© 2007 Microchip Technology Inc.
Input Signal
T
Bit Timing Logic
Q
bit 7-0
bit 7-0
Sync
TEC - TRANSMITTER ERROR COUNTER
REC - RECEIVER ERROR COUNTER
BIT TIME PARTITIONING
TEC7:TEC0: Transmit Error Counter bits
REC7:REC0: Receive Error Counter bits
bit 7
Legend:
R = Readable bit
- n = Value at POR
bit 7
Legend:
R = Readable bit
- n = Value at POR
REC7
TEC7
R-0
R-0
Segment
Prop
REC6
TEC6
R-0
R-0
Q
). The
REC5
TEC5
R-0
R-0
W = Writable bit
‘1’ = Bit is set
W = Writable bit
‘1’ = Bit is set
Segment 1
Phase
Sample Point
REC4
TEC4
R-0
R-0
nominal bit time is calculated by programming the T
length and the number of T
discussed below.
2.4.1
Time Quantum is a fixed unit of time derived from the
oscillator period. There is a programmable baud rate
prescaler (BRP) (with integral values ranging from 1 to
64) as well as a fixed division by two for clock
generation.
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
REC3
TEC3
R-0
R-0
TIME QUANTUM (
MCP2502X/5X
REC2
TEC2
R-0
R-0
Segment 2
Phase
Q
in each time segment, as
x = Bit is unknown
x = Bit is unknown
T
REC1
TEC1
Q
R-0
R-0
)
DS21664D-page 7
REC0
TEC0
R-0
R-0
bit 0
bit 0
Q