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| 型号： | MCP2022AT-330E/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 45/48页 |
| 文件大小： | 0K |
| 描述： | IC TXRX LIN 3.3V LDO 14-TSSOP |
| 产品培训模块： | Microchip MCP20xx LIN Transceiver Overview |
| 标准包装： | 2,500 |
| 系列： | * |
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MCP2021A/2A
DS22298A-page 6
2012 Microchip Technology Inc.
1.3
Fail-Safe Features
1.3.1
GENERAL FAIL-SAFE FEATURES
An internal pull-down resistor on 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 in recessive if 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.
1.3.2
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.
TABLE 1-2:
PINOUT OVERVIEW
PIN Name
PIN Number
PIN Type
Function
MCP2021A
MCP2022A
VREG
3
Output
Voltage Regulator Output
VSS
5
11
Power
Ground
VBB
7
13
Power
Battery
TXD
4
Input, HV-tolerant
Transmit Data Input
RXD
1
Output
Receive Data Output
LBUS
6
12
I/O, HV
LIN Bus
CS/LWAKE
2
TTL Input, HV-tolerant Chip Select and Local Wake-up Input
FAULT/TXE
8
14
I/O, HV-tolerant
Fault Detect Output/Transmitter Enable Input
RESET
-
5
Output
Reset Output
TABLE 1-3:
FAULT/TXE TRUTH TABLE
TXD
In
RXD
Out
LIN BUS
I/O
Thermal
Override
FAULT/TXE
Definition
External
Input
Driven
Output
CS = 1
LH
VBB
OFF
H
L
FAULT, TXD driven low, LIN BUS shorted to
VBB (Note 1), or LBUS/TXD permanent
dominant detected, and Transmit time-out
shutdown.
HH
VBB
OFF
H
OK
LL
GND
OFF
H
OK
HL
GND
OFF
H
OK, data is being received from the LIN BUS
xx
VBB
ON
H
L
FAULT, Transceiver in thermal shutdown
xx
VBB
xL
x
NO FAULT, the CPU is commanding the
transceiver to turn off the transmitter driver
CS = 0 after a wake-up
xx
x
L
Wake-up from LIN bus activity
xx
x
H
Wake-up from POR
Legend: x = don’t care
Note 1:
The FAULT/TXE is valid after approximately 25 s after TXD falling edge. This is to eliminate false fault
reporting during bus propagation delays.
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| MCP2022AT-500E/SL | 功能描述:LIN 收发器 LIN Transceiver + 5.0V LDO RoHS:否 制造商:NXP Semiconductors 工作电源电压: 电源电流: 最大工作温度: 封装 / 箱体:SO-8 |
| MCP2022AT-500E/ST | 功能描述:LIN 收发器 LIN Transceiver + 5.0V LDO RoHS:否 制造商:NXP Semiconductors 工作电源电压: 电源电流: 最大工作温度: 封装 / 箱体:SO-8 |
| MCP2022P | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:LIN Transceiver with Voltage Regulator |
| MCP2022P-330E/SL | 功能描述:LIN 收发器 LIN Transceiver with Vreg and LIN RoHS:否 制造商:NXP Semiconductors 工作电源电压: 电源电流: 最大工作温度: 封装 / 箱体:SO-8 |
| MCP2022P-330E/ST | 功能描述:LIN 收发器 LIN Transceiver with Vreg and LIN RoHS:否 制造商:NXP Semiconductors 工作电源电压: 电源电流: 最大工作温度: 封装 / 箱体:SO-8 |
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