參數(shù)資料
型號(hào)： L99PM62XP
廠商： STMICROELECTRONICS
元件分類(lèi)： 電源管理
英文描述： 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36
封裝： ROHS COMPLIANT, POWERSSO-36
文件頁(yè)數(shù)： 24/98頁(yè)
文件大?。?/td> 1117K
代理商： L99PM62XP
Description
L99PM62XP
Doc ID 16363 Rev 2
Dominant TxDC time out
If TXDC is in dominant state (low) for t > tdom(TxD) the transmitter is disabled, status bit is
latched and can be read and optionally cleared by SPI. The transmitter remains disabled
until the status register is cleared.
CAN permanent recessive
If TXDC changes to dominant (low) state but CAN bus does not follow for 4 times, the
transmitter is disabled, status bit is latched and can be read and optionally cleared by SPI.
The transmitter remains disabled until the status register is cleared.
CAN permanent dominant
If the bus state is dominant (low) for t > tCAN 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.
RXDC permanent recessive
If RXDC pin is clamped to recessive (high) state, the controller is not able to recognize a bus
dominant state and could start messages at any time, which results in disturbing the overall
bus communication. Therefore, if RXDC does not follow TXDC for 4 times 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.
2.9.2
Wake up (from CAN)
When the L99PM62XP is in standby mode with CAN wake up option enabled, the CAN bus
traffic is detected. For the wake up feature the L99PM62XP logic differentiates different
conditions. During V1 Standby mode RXDC output is kept at recessive level. Independent
from the wakeup pattern selected and independent from the previous Standby mode, the
RXDC reflect immediately the bus state after the wakeup. This feature allows
implementation of a ‘partial networking’ functionality controlled by the system
microcontroller.
Normal pattern wake up
Normal pattern wake up can occur when CAN pattern wake up option is enabled and the
CAN transceiver was set in standby mode while CAN bus was in recessive (high) state or
dominant (low) state. In order to wake up the L99PM62XP, the following criteria must be
fulfilled:
●
The CAN interface wake-up receiver must receive a series of two consecutive valid
dominant pulses, each of which must be longer than 2 s
●
The distance between 2 pulses must be longer than 2 s.
●
The two pulses must occur within a time frame of 1.0 ms
Wake up from short to GND condition
Even if CAN pattern wake up option is enabled, but the CAN transceiver was set in standby
mode after a qualified permanent dominant state, recessive level at CAN, switches the
L99PM62XP to active mode.
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