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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP201 Datasheet

LIN Transceiver

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MCP201 pdf
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MCP201
LIN Transceiver with Voltage Regulator
Features
• Supports baud rates up to 20 Kbaud
• 40V load dump protected
• Wide supply voltage, 6.0 – 18.0V, continuous
- Maximum input voltage of 30V
• Extended Temperature Range: -40°C to +125°C
• Interface to standard USARTs
• Compatible with LIN Spec 1.3
• Local Interconnect Network (LIN) Line pin:
- Internal pull-up resistor and diode
- Protected against ground shorts (LIN pin to
ground)
- Protected against LIN pin loss of ground
- High current drive, 40 mA IOL 200 mA
• Automatic thermal shutdown
• On-board Voltage Regulator:
- Output voltage of 5V with ±5% tolerances
over temperature range
- Maximum output current of 50 mA
- Able to drive an external series-pass
transistor for increased current supply
capability
- Internal thermal overload protection
- Internal short-circuit current limit
- External components limited to filter capacitor
only and load capacitor
Block Diagram
VREG
Internal Circuits
Package Types
PDIP, SOIC, DFN
RXD
1
CS/WAKE
2
VREG
3
TXD
4
8
7
6
5
Voltage
Regulator
Wake-Up
Logic
Ratiometric
Reference
FAULT/SLPS
VBAT
LIN
VSS
VBAT
RXD
CS/WAKE
TXD
FAULT/SLPS
POR
Slope
Control
OC
Thermal
Protection
approx.
30 kΩ
LIN
Vss
© 2007 Microchip Technology Inc.
DS21730F-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP201 Datasheet

LIN Transceiver

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MCP201 pdf
MCP201
NOTES:
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DS21730F-page 2
© 2007 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP201 Datasheet

LIN Transceiver

No Preview Available !

MCP201 pdf
MCP201
1.0 DEVICE OVERVIEW
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1.2 Internal Protection
The MCP201 provides a physical interface between a
microcontroller and a LIN half-duplex bus. It is intended
for automotive and industrial applications with serial
bus speeds up to 20 Kbaud.
The MCP201 provides a half-duplex, bidirectional
communications interface between a microcontroller
and the serial network bus. This device will translate
the CMOS/TTL logic levels to LIN level logic, and vice
versa.
The LIN specification 1.3 requires that the transceiver
of all nodes in the system be connected via the LIN pin,
referenced to ground and with a maximum external
termination resistance of 510Ω from LIN bus to battery
supply. The 510Ω corresponds to 1 Master and 16
Slave nodes.
The MCP201 provides a +5V 50 mA regulated power
output. The regulator uses a LDO design, is short-
circuit-protected and will turn the regulator output off if
it falls below 3.5V. The MCP201 also includes thermal
shutdown protection. The regulator has been specifi-
cally designed to operate in the automotive environ-
ment and will survive reverse battery connections,
+40V load dump transients and double-battery jumps
(see Section 1.6 “Internal Voltage Regulator”).
1.1 Optional External Protection
1.1.1
TRANSIENT VOLTAGE
PROTECTION (LOAD DUMP)
An external 27V transient suppressor (TVS) diode,
between VBAT and ground, with a 50Ω resistor in series
with the battery supply and the VBAT pin, serves to pro-
tect the device from power transients (see Figure 1-2)
and ESD events. While this protection is optional, it
should be considered as good engineering practice.
1.2.1 ESD PROTECTION
For component-level ESD ratings, please refer to the
maximum operation specifications.
1.2.2 GROUND LOSS PROTECTION
The LIN bus specification states that the LIN pin must
transition to the recessive state when ground is
disconnected. Therefore, a loss of ground effectively
forces the LIN line to a hi-impedance level.
1.2.3 THERMAL PROTECTION
The thermal protection circuit monitors the die
temperature and is able to shut down the LIN
transmitter and voltage regulator. Refer to Table 1-1 for
details.
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
Driving the TXD and checking the RXD pin makes it
possible to determine whether there is a bus contention
(Rx = low, Tx = high) or a thermal overload condition
(Rx = high, Tx = low).
Note:
After recovering from a thermal, bus or
voltage regulator overload condition, the
device will be in the Ready1 mode. In order
to go into Operational mode, the CS/
WAKE pin has to be toggled.
1.1.2 REVERSE BATTERY PROTECTION
An external reverse-battery-blocking diode can be
used to provide polarity protection (see Figure 1-2).
This protection is optional, but should be considered as
good engineering practice.
TABLE 1-1: SOURCES OF THERMAL OVERLOAD(1,2)
TXD
RXD
Comments
L H LIN transmitter shutdown, receiver and voltage regulator active, thermal overload
condition.
H L Regulator shutdown, receiver active, bus contention.
Legend: x = Don’t care, L = Low, H = High
Note 1: LIN transceiver overload current on the LIN pin is 200 mA.
2: Voltage regulator overload current on voltage regulator greater than 50 mA.
© 2007 Microchip Technology Inc.
DS21730F-page 3




Part Number MCP201
Description LIN Transceiver
Maker Microchip Technology
Total Page 30 Pages
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