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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2021A Datasheet

LIN Transceiver

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MCP2021A pdf
MCP2021A/2A
LIN Transceiver with Voltage Regulator
Features:
• The MCP2021A/2A are compliant with LIN Bus
Specifications Version 1.3, 2.1 and with SAE
J2602-2
• Support Baud Rates up to 20 kBaud
• 43V Load Dump Protected
• Maximum Continuous Input Voltage: 30V
• Wide LIN-Compliant Supply Voltage: 6.0 – 18.0V
• Extended Temperature Range: -40 to +125°C
• Interface to PIC® MCU EUSART and Standard
USARTs
• Wake-Up on LIN Bus Activity or Local Wake Input
• Local Interconnect Network (LIN) Bus Pin:
- Internal Pull-Up Termination Resistor and
Diode for Slave Node
- Protected Against VBAT Shorts
- Protected Against Loss of Ground
- High-Current Drive
• TXD and LIN Bus Dominant Time-Out Function
• Two Low-Power Modes:
- Transmitter Off: 90 µA (typical)
- Power Down: 4.5 µA (typical)
• Output Indicating Internal Reset State (POR or
Sleep Wake)
• MCP2021A/2A On-Chip Voltage Regulator:
- Output Voltage of 5.0V or 3.3V
at 70 mA Capability with Tolerances of ±3%
Over the Temperature Range
- Internal Short Circuit Current Limit
- External Components Limited to Filter
Capacitor and Load Capacitor
• Automatic Thermal Shutdown
• High Electromagnetic Immunity (EMI), Low
Electromagnetic Emission (EME)
• Robust ESD Performance: ±15 kV for LBUS and
VBB pin (IEC61000-4-2)
• Transient Protection for LBUS and VBB Pins in
Automotive Environment (ISO7637)
• Meets Stringent Automotive Design
Requirements, including “OEM Hardware
Requirements for LIN, CAN and FlexRay
Interfaces in Automotive Applications”, Version
1.2, March 2011
• Multiple Package Options, including Small
4x4 mm DFN Package
Description:
The MCP2021A/2A provide a bidirectional, half-duplex
communication physical interface to meet the LIN bus
specification Revision 2.1 and SAE J2602-2. The
devices incorporate a voltage regulator with 5V or 3.3V
at 70 mA regulated power supply output. The devices
have been designed to meet the stringent quiescent
current requirements of the automotive industry and
will survive +43V load dump transients and double
battery jumps.
Package Types
RXD
CS/LWAKE
VREG
TXD
MCP2021A
PDIP, SOIC
18
27
36
45
FAULT/TXE
VBB
LBUS
VSS
MCP2021A
4x4 DFN
RXD 1
CS/LWAKE 2
VREG 3
TXD 4
8 FAULT/TXE
EP 7 VBB
9 6 LBUS
5 VSS
MCP2022A
PDIP, SOIC, TSSOP
RXD
CS/LWAKE
VREG
TXD
RESET
NC
NC
1
2
3
4
5
6
7
14 FAULT/TXE
13 VBB
12 LBUS
11 VSS
10 NC
9 NC
8 NC
* Includes Exposed Thermal Pad (EP), see Table 1-2.
2012-2014 Microchip Technology Inc.
DS20002298C-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2021A Datasheet

LIN Transceiver

No Preview Available !

MCP2021A pdf
MCP2021A/2A
MCP2021A/2A Block Diagram
Short Circuit
Protection
VREG
Internal Circuits
VREG
RXD
CS/LWAKE
TXD
4.2V
FAULT/TXE
VREG
Thermal
Protection
Voltage
Regulator
Wake-Up Logic
and
Power Control
Ratiometric
Reference
Bus Wake-Up
RESET
(MCP2022A only)
VBB
Slope Control
Bus
Dominant
Timer
~ 30 k
LBUS
VSS
Thermal and
Short Circuit
Protection
DS20002298C-page 2
2012-2014 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2021A Datasheet

LIN Transceiver

No Preview Available !

MCP2021A pdf
MCP2021A/2A
1.0 DEVICE OVERVIEW
The MCP2021A/2A devices provide a physical
interface between a microcontroller and a LIN
half-duplex bus. They are intended for automotive and
industrial applications with serial bus baud rates up to
20 kBaud. These devices will translate the CMOS/TTL
logic levels to LIN logic levels and vice versa.
The MCP2021A/2A offer optimum EMI and ESD
performance and can withstand high voltage on the LIN
bus. The devices support two low-power modes to
meet automotive industry power consumption
requirements. The MCP2021A/2A also provide a +5V
or 3.3V regulated power output at 70 mA.
1.1 Modes of Operation
The MCP2021A/2A work in five modes: Power-On
Reset, Power-Down, Ready, Operation and
Transmitter Off. For an overview of all operational
modes, please refer to Table 1-1. For the operational
mode transition, please refer to Figure 1-1.
FIGURE 1-1:
STATE DIAGRAM
CS/LWAKE = 0
POR(2)
VREG OFF
RX OFF
TX OFF
VBB > VON
READY
VREG ON
RX ON
TX OFF
CS/LWAKE = 1 &
FAULT/TXE = 1(3) &
TXD = 1&
VREG_OK = 1(1)
CS/LWAKE = 1 OR
Voltage Rising Edge on LBUS
CS/LWAKE = 1&
FAULT/TXE = 0&
TX OFF
VREG ON
RX ON
TX OFF
CS/LWAKE = 0
CS/LWAKE = 1&
FAULT/TXE = 1(3)&
TXD = 1
CS/LWAKE = 1&
FAULT/TXE = 0
OPERATION
VREG ON
RX ON
TX ON
POWER-DOWN
VREG OFF
RX OFF
TX OFF
CS/LWAKE = 0
Note 1: VREG_OK: Regulator Output Voltage > 0.8VREG_NOM.
2: If the voltage on pin VBB falls below VOFF, the device will enter Power-On Reset mode from all other
modes, which is not shown in the figure.
3: FAULT/TXE = 1 represents input high and no fault conditions. FAULT/TXE = 0 represents input low or a
fault condition. Refer to Table 1-5.
2012-2014 Microchip Technology Inc.
DS20002298C-page 3




Part Number MCP2021A
Description LIN Transceiver
Maker Microchip
Total Page 30 Pages
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