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參數(shù)資料
| 型號： | 33742 |
| 廠商： | Motorola, Inc. |
| 元件分類： | CAN |
| 英文描述： | System Basis Chip (SBC) with Enhanced High-Speed CAN Transceiver |
| 中文描述： | 系統(tǒng)基礎芯片的增強型（SBC）的高速CAN收發(fā)器 |
| 文件頁數(shù)： | 30/52頁 |
| 文件大小： | 1087K |
| 代理商： | 33742 |
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33742
30
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Figure 17. CAN Interface Levels
TXD and RXD Terminals
The TXD terminal has an internal pullup to V2. The state of
TXD depends on the V2 status. RXD is a push-pull structure,
supplied by V2. When V2 is set at 5.0 V and CAN is TXRX
mode, RXD reports bus status. For details, refer to
Table 2
,
page 20,
Table 4
, below, and
Table 5
, page 31.
CAN TXRX Mode and Slew Rate Selection
The slew rate selection is done via CAN register (refer to
Tables 16
through
18
on page 40). Four slew rates are
available, and controls the recessive to dominant and dominant
to recessive transitions. The delay time from TXD terminal to
CAN bus, from CAN bus to RXD and the TXD to RXD loop time
is affected by the slew rate selection.
CANH
TXD
RXD
Typ 2.5 V
CANL
CAN Recessive State
CAN Dominant State
CAN Recessive State
Typ 2.5 V
V
CANH
-V
CANL
> 900 mV
V
CANH
-V
CANL
< 500 mV
Table 4. CAN Interface/33742 Modes and Terminal Status—Operation with Ballast on V2
(Note 44)
Mode
CAN Mode
(Controlled by SPI)
V2 Voltage
TXD Terminal
RXD Terminal
CANH/CANL
(Disconnected
from Other Node)
CAN
Communication
Unpowered
–
0 V
LOW
LOW
Floating to GND
NO
Reset (with Ballast)
–
0 V
LOW
LOW
Floating to GND
NO
Normal Request
(with Ballast)
–
0 V
LOW
LOW
Floating to GND
NO
Normal
Sleep
5.0 V
0 V
5.0 V
Floating to GND
NO
Normal
Normal
Slew Rate 0, 1, 2, 3
5.0 V
Internal Pullup
to V2
Report Bus State
HIGH if Bus
Recessive,
LOW if dominant
Bus Recessive
CANH = CANL =
2.5 V
YES
Standby with
External Ballast
Normal or Sleep
0 V
LOW
LOW
Floating to GND
NO
Sleep
Sleep
0 V
LOW
LOW
Floating to GND
NO.
Wake-up if enabled
Stop
Sleep
0 V
LOW
LOW
Floating to GND
NO.
Wake-up if enabled
Notes
44.
See also
Figure 28,
page 46.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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