MCP2021-500E/P Microchip Technology, MCP2021-500E/P Datasheet - Page 4

• Manufacturer Part Number: MCP2021-500E/P
• Description: IC LIN TXRX ON-BOARD VREG 8DIP
• Manufacturer: Microchip Technology
• Type: Transceiverr

Specifications of MCP2021-500E/P

• Number Of Drivers/receivers: 1/1
• Protocol: LIN
• Voltage - Supply: 6 V ~ 18 V
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: APGRD004 - REF DESIGN MOD AUTO AMBNT LIGHTAC164130 - BOARD DAUGHT PICTL PLUS ECAN/LIN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP2021/2
1.3
For an overview of all operational modes, please refer
to
1.3.1
Upon application of V
Reset mode (POR). During this mode, the part
maintains the digital section in a reset mode and waits
until the voltage on pin V
threshold (Typ. 5.75V) to enter to the Ready mode. If
during the operation, the voltage on pin V
the “OFF” threshold (Typ. 4.25V), the part comes back
to the Power-On-Reset mode.
1.3.2
In the Power-down mode, the transmitter and the
voltage regulator are both off. Only the receiver
section, and the CS/LWAKE pin wake-up circuits are in
operation. This is the lowest power mode.
If any bus activity (e.g. a BREAK character) or CS/
LWAKE going to a high level should occur during
Power-down mode, the device will immediately enter
the Ready mode, enable the voltage regulator, and
once the output has stabilized (approximately 0.3 ms to
1.2 ms), go to the Operation mode.
The part will also enter the Ready mode, followed by
the Operation mode, if the CS/LWAKE pin should
become active true (‘1’).
The part may only enter the Power-down mode after
going through an Operation mode step.
1.3.3
Upon entering the Ready mode, the voltage regulator
and receiver threshold detect circuit are powered up.
The transmitter remains in power down mode. The
device is ready to receive data but not to transmit. If a
microcontroller is being driven by the voltage regulator
output, it will go through a Power-on Reset and initial-
ization sequence. The LIN pin is in the recessive state.
The device will stay in the Ready mode until the output
of the voltage regulator has stabilized and CS/LWAKE
pin is true (‘1’). After V
true, the transmitter is enabled and the part enters the
Operation mode.
On Power-on of the V
stay in the Ready mode if CS/LWAKE is low. If CS/
LWAKE is high, the device will immediately enter the
Operation mode.
DS22018E-page 4
Note:
Table
1-1.
Modes of Operation
POWER-ON-RESET MODE
The above time interval < 1.2 ms assumes
12V V
event.
READY MODE
POWER-DOWN MODE
BB
input and no thermal shutdown
BB
BB
REG
, the device enters Power-On-
supply pin, the component will
is OK and CS/LWAKE pin is
BB
rises above the “ON”
BB
falls below
1.3.4
In this mode, all internal modules are operational.
The MCP2021/2 will go into the Power-down mode on
the falling edge of CS/LWAKE.
1.3.5
Whenever the FAULT/TXE signal is low and the L
transmitter is off.
The transmitter may be re-enabled whenever the
FAULT/TXE signal returns high, either by removing the
internal fault condition or the CPU returning the FAULT/
TXE high. The transmitter will not be enabled if the
FAULT/TXE pin is brought high when the internal fault
is still present.
The transmitter is also turned off whenever the voltage
regulator is unstable or recovering from a fault. This
prevents unwanted disruption of the bus during times of
uncertain operation.
1.3.5.1
The Wake-up sub module observes the L
to detect bus activity. Bus activity is detected when the
voltage on the L
approximately 3V for at least a typical duration of 10 µs.
Such a condition causes the device to leave the Power-
down mode.
FIGURE 1-2:
CS/LWAKE
Note:
= false
Transmitter
FAULT/TXE = true
Mode
FAULT/TXE
Off
= false
OPERATION MODE
TRANSMITTER OFF MODE
While the MCP2021/2 is in shutdown, T
should not be actively driven high or it may
power internal logic through the ESD
diodes and may damage the device.
Wake-up
Operation
BUS
Power-down
CS/LWAKE
Mode
= false
Mode
OPERATIONAL MODES
STATE DIAGRAMS
© 2009 Microchip Technology Inc.
stays below a threshold of
CS/LWAKE = true
V
REG
AND
OK = true
Ready
Mode
Start
Bus Activity
CS/LWAKE = true
OR
BUS
V
BB
OK = true
POR
in order
BUS
XD