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參數(shù)資料
| 型號： | MCP2050-500E/SL |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 2/42頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX LIN 5.0V LDO/WWDT 14SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Microchip MCP20xx LIN Transceiver Overview |
| 標準包裝： | 57 |
| 系列： | * |
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2012 Microchip Technology Inc.
DS22299B-page 10
MCP2050
1.3.12
WWDTSELECT
This is an analog input pin that sets the open window
time to accept a trigger reset. A resistor between this
pin and VSS set this time. A value between 33 k
and
680 k
is determined by the following equation:
The normal window length:
tNORMAL= 0.2 ms * (RWWDTSELECT +1) +/-15%
The power up window length:
tPOWERUP = 0.8 ms*(RWWDTSELECT+1) +/-15%
The RESET signal duration:
tWDRST = 150 uS+/-35%.
RWWDTSELECT is in k
The normal window length ranges from 6.8 ms [0.2 *
(33+1), typical] to 136 ms [0.2 * (680+1)]. Similarly, the
power up window length ranges from 27 ms to 545 ms,
typical, and the RESET signal duration is 150uS.
1.3.13
VBATRATIO
This is an analog output pin that reflects the voltage at
the
VBAT pin. It is scaled by VREG such that:
VBATRATIO = VBAT/24 * VREG
0 <= VBATRATIO <= VREG
FIGURE 1-6:
VBATRATIO OUTPUT RANGE
1.4
Fail-Safe Features
1.4.1
GENERAL FAIL-SAFE FEATURES
An internal pull-down resistor on the CS/LWAKE
pin disables the transmitter if the pin is floating.
An internal pull-up resistor on the TXD pin places
TXD in HIGH, thus the LBUS is recessive if the
TXD pin is floating.
High-impedance and low leakage current on LBUS
during loss of power or ground.
The current limit on LBUS protects the transceiver
from being damaged if the pin is shorted to VBB.
1.4.2
THERMAL PROTECTION
The thermal protection circuit monitors the die
temperature and is able to shut down the LIN
transmitter and voltage regulator.
There are three causes for a thermal overload. A
thermal shut down can be triggered by any one, or a
combination of, the following thermal overload
conditions.
Voltage regulator overload
LIN bus output overload
Increase in die temperature due to increase in
environment temperature
The recovery time from the thermal shutdown is equal
to adequate cooling time.
Driving the TXD and checking the RXD pin makes it
possible to determine whether there is a bus contention
(TXD = high, RXD = low) or a thermal overload
condition (TXD = low, RXD = high).
FIGURE 1-7:
THERMAL SHUTDOWN
STATE DIAGRAMS
Note 1: Linear range of VBATRATIO is between 6.0VBB and 18.0VBB.
0
VBB
.25VREG
.75VREG
VREG/2
VBATRATIO
6V
12V
18V
24V
Operation
Mode
Transmitter
Shutdown
LIN bus
Voltage
Shutdown
Regulator
Output
Temp < SHUTDOWNTEMP
shorted
to VBB
Overload
Temp < SHUTDOWN
TEMP
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