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| 型号： | TLE6266G |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | 18 MM, PLASTIC, SOP-28 |
| 文件页数： | 15/50页 |
| 文件大小： | 1020K |
| 代理商： | TLE6266G |
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Datasheet TLE 6266 G
Version 2.21
22
July 29th, 2005
7
Explanation of the Mode Transitions
To better understand the description, the reader has to be familiar with the Chapter 6.
All descriptions are starting from the normal mode, as the main operation mode. This
means, the component was powered up before and after the power up procedure
automaticaly in the Vbat stand-by mode.
Now, the watchdog circuit has to be operated correctly to switch the component in the
other modes ( details see Chapter 6). So the starting point is the TLE 6266 in normal
mode with a correct triggered watchdog like shown in Figure 8,9,10.
Normal Mode and Cyclic HS ON
In normal mode, the watchdog has to be triggered within the open window with a
dedicated SPI input command (Watchdog Trigger IBit 0, alternatively HIGH, LOW,...).
The CAN bus communication is active and a message can be transfered/received. After
the correct SPI input command to change into the Cyclic HS mode, the HS3 switch gets
activated. In parallel a long open window is started, wich has to be triggered. This mode
can be operated as long as the watchdog is triggered correctly. In this mode, no
communication is possible but an external circuit can be supplied by HS3. CANL is
pulled up to Vs by the RTL termination, CANH is pulled to GND via RTH.
Cyclic HS OFF mode
To switch from HS ON to HS OFF, the PWM input has to be triggered with a falling egde.
This is called the PWM failsafe trigger to avoid unwanted transitions into the HS OFF
mode. In the HS OFF mode the HS3 switch is deactivated and the lowest power
consumption is achieved. The LDO monitors Vcc and switches on/off due to a special
control mechanism explained in Chapter 6.5. Three possibilities can switch the TLE
6266 back to the cyclic wake HS ON mode:
7.1
CAN Bus Wake-Up
CANL is pulled to Vs. A signal transition at CANL below a certain wake-up threshold
causes a wake up and automatic transition into the cyclic HS ON mode (see Figure 8).
HS3 is activated again and also the long open window of the watchdog mechanism. The
watchdog has to be triggered correctly from that time on. If the signal at the PWM pin
makes a HIGH to LOW transition, the device switches to HS OFF again.
This wake up via the CAN bus message is flagged to the C by setting the RxD output
pin from HIGH to LOW. The reason for this behavior is to indicate the C a wake up
request. Now, the C is able to activate the whole module to serve the requested action
by the bus system.
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