參數(shù)資料
型號： L4969
廠商： 意法半導體
英文描述： SYSTEM VOLTAGE REGULATOR WITH FAULT TOLERANT LOW SPEED CAN-TRANSCEIVER
中文描述： 系統(tǒng)電壓調節(jié)器容錯低速的CAN收發(fā)器
文件頁數(shù)： 11/35頁
文件大?。?/td> 337K
代理商： L4969
11/35
L4969
1.3
– Supports double wire unshielded busses
– Baud rate up to 125KBaud
– Short circuit protection (battery, ground, wires shorted)
– Single wire operation possible (automatic switching to single wire upon bus failures)
– Bus not loaded in case of unpowered transceiver
CAN Transceiver
The CAN transceiver stage is able to transfer serial data on two independent communication wires either def-
erentially (normal operation) or in case of a single wire fault on the remaining line. The physical bitcoding is done
using dominant (transmitter active) and overwritable recessive states. Too long dominant phases are detected
internally and further transmission is automatically disabled (malfunction of protocol unit does not affect com-
munication on the bus, "fail-safe" - mechanism). For low current consumption during bus inactivity a sleep mode
is available. The operating mode can be entered from the sleep mode either by local wake up (
μ
C) or upon de-
tection of a dominant bit on the CAN-bus (external wake up).
Ten different errors on the physical buslines can be distinguished:
1.3.1 Detectable Physical Busline Failures
Not all of the 10 different errors lead to a breakdown of the whole communication.
So the errors can be categorized into 'negligible', 'problematic' and 'severe':
N
Type of Errors
Conditions
Errors caused by damage of the datalines or isolation
I
CANH wire interrupted (tied to Ground or termination)
Edgecount difference > 3
II
CANL wire interrupted (floating or tied termination)
Edgecount difference > 3
III
CANH short circuit to V
BAT
(overvoltage condition)
V(CANH) > 7.2V after 32us
IV
CANL short circuit to GND (permanently dominant)
V(CANL) < 3.1V & V(CANH)-V(CANL)
< -3.25V after 1.3ms
V
CANH short circuit to GND (permanently recessive)
Edgecount difference > 3
VI
CANL short circuit to V
BAT
(overvoltage condition)
V(CANL) > 7.2V after 32us
VII
CANL shorted to CANH
V(CANH) - V(CANL) < -3.25V after
1.3ms
Errors caused by misbehavior of transceiver stage
VIII
CANH short circuit to VDD (permanently dominant)
V(CANH) > 1.8V & V(CANH) -
V(CANL) < -3.25V after 2.5ms
IX
CANL short circuit to VDD (permanently recessive)
Edgecount difference > 3
Errors caused by defective protocol unit
X
CANH, CANL driven dominant for more than 1.3ms
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