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参数资料
| 型号： | L99PM62XP |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36 |
| 封装： | ROHS COMPLIANT, POWERSSO-36 |
| 文件页数： | 21/98页 |
| 文件大小： | 1117K |
| 代理商： | L99PM62XP |
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Description
L99PM62XP
Doc ID 16363 Rev 2
2.8.1
Error handling
The L99PM62XP provides the following 3 error handling features which are not described in
the LIN Spec. V2.1, but are realized in different stand alone LIN transceivers / micro
controllers to switch the application back to normal operation mode.
Dominant TxDL time out
If TXDL is in dominant state (low) for more than 12 ms (typ) the transmitter is disabled, the
status bit is latched and can be read and optionally cleared by SPI. The transmitter remains
disabled until the status register is cleared. This feature can be disabled via SPI.
Permanent recessive
If TXDL changes to dominant (low) state but RXDL signal does not follow within 40 s the
transmitter is disabled, the status bit is latched and can be read and optionally cleared by
SPI. The transmitter remains disabled until the status register is cleared.
Permanent dominant
If the bus state is dominant (low) for more than 12 ms a permanent dominant status is
detected. The status bit is latched and can be read and optionally cleared by SPI. The
transmitter is not disabled.
2.8.2
Wake up (from LIN)
In standby mode the L99PM62XP can receive a wake up from LIN bus. For the wake up
feature the L99PM62XP logic differentiates two different conditions.
Normal wake up
Normal wake up can occur when the LIN transceiver was set in standby mode while LIN was
in recessive (high) state. A dominant level at LIN for tlinbus, switches the L99PM62XP to
active mode.
Wake up from short to GND condition
If the LIN transceiver was set in standby mode while LIN was in dominant (low) state,
recessive level at LIN for tlinbus, switches the L99PM62XP to active mode.
Note:
A wake up caused by a message on the bus starts the voltage regulator and the
microcontroller to switch the application back to normal operation mode.
2.8.3
LIN pull-up
The master node pull-up resistor (1 k
Ω) can be connected to Vs using the internal LIN_PU
high-side switch. This high-side switch can be controlled by SPI in order to allow
disconnection of the pull-up resistor in case of LIN bus short to GND conditions.
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