P82C150AFT Philips Semiconductors, P82C150AFT Datasheet - Page 18

• Manufacturer Part Number: P82C150AFT
• Description: CAN Serial Linked I/O device SLIO with digital and analog port functions
• Manufacturer: Philips Semiconductors

Philips Semiconductors
7.3.5
The Nominal Bit Time of the P82C150 is subdivided into 10
Time Quanta. The Synchronization Time Segment
(SYNC_SEG) and the Propagation Time Segment
(PROP_SEG) are each one Time Quantum long. The
Phase Buffer Segment 1 (PHASE_SEG1) and the Phase
Buffer Segment 2 (PHASE_SEG2) are each four Time
Quanta long. The Resynchronization Jump Width (SJW) is
four Time Quanta long.
The sample point is located at the end of the Phase Buffer
Segment 1. The Nominal Bit Time is internally adjusted to
Table 11 Bit time subdivision
7.3.6
The transceiver of the P82C150 consists of the
configurable input comparator and of complementary
open-drain driver outputs. The reference voltage REF is
an additional output.
7.3.6.1
The input comparator monitors the transient voltage on
RX1 and RX0.
The result of the input comparator is logic 1 if the voltage
levels of the CAN-bus lines are regarded as recessive, and
logic 0 if they are regarded as dominant.
Table 12 CAN-bus driver output function
1996 Jun 19
TX0
TX1
SYNC_SEG PROP_SEG
CAN Serial Linked I/O device (SLIO) with
digital and analog port functions
CAN OUTPUT
BT1
B
CAN-B
IT
CAN-bus input comparator (RX0, RX1)
T
IMING
US
T
BT2
RANSCEIVER
floating
floating
RECESSIVE
BT3
LOW
HIGH
MODES 0 AND 1
BT4
PHASE_SEG1
DOMINANT
1 BIT TIME
BT5
18
LOW
floating
that bit timing which is provided by the crystal driven host
(calibration message).
The usable bus length at a given bit rate is reduced in
comparison to other CAN controllers with programmable
bit timing because the Propagation Time Segment is fixed
to
of the crystal driven host should be programmed like the
fixed bit segmentation of the P82C150, e.g. one bit time
segment is
to Table 15 for bit time programming).
The recessive state and the dominant state are not
equivalent and may not be mixed-up.
The input comparator is configurable depending on the
four CAN-bus modes (see Table 10), supporting
battery-powered applications (Sleep Mode) and tolerance
against bus wiring failures.
7.3.6.2
The output driver function is shown in Table 12. The output
driver TX1 is disabled in bus mode 2 to tolerate a
short-circuit between the CAN-bus lines in a two-wire
differential CAN physical layer.
1
10
MODE 2
BT6
length of the Nominal Bit Time. The bit segmentation
CAN-bus output drivers (TX0, TX1)
1
10
length of the Nominal Bit Time (refer also
BT7
floating
floating
RESET STATE, BUS-OFF AND
SLEEP MODE (MODE 3)
BT8
PHASE_SEG2
Preliminary specification
BT9
P82C150
BT10