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MCP2003T-E/P bảng dữ liệu(PDF) 9 Page - Microchip Technology

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 2010-2014 Microchip Technology Inc.
DS20002230F-page 9
MCP2003/4/3A/4A
1.5
Pin Descriptions
TABLE 1-2:
PINOUT DESCRIPTIONS
1.5.1
RECEIVE DATA OUTPUT (RXD)
The Receive Data Output pin is an open drain (OD)
output and follows the state of the LIN pin, except in
Power Down mode.
1.5.1.1
RXD Monitoring
The RXD pin is internally monitored. It has to be at a
high level (> 2.5V typical) while LBUS is recessive.
Otherwise, an internal fault will be created and the
device will transition to Transmitter Off mode. On the
MCP2004/2004A, the FAULT/TXE pin will be driven low
to indicate the Transmitter Off state.
1.5.2
CHIP SELECT (CS)
This is the Chip Select Input pin. An internal pull-down
resistor will keep the CS pin low. This is done to ensure
that no disruptive data will be present on the bus while
the microcontroller is executing a Power-on Reset and
an I/O initialization sequence. The pin must detect a
high level to activate the transmitter. An internal Low-
Pass filter, with a typical time constant of 10 µs,
prevents unwanted wake-up (or transition to Power
Down mode) on glitches.
If CS = 0 when the VBB supply is turned on, the device
goes to Ready mode as soon as internal voltages sta-
bilize, and stays there as long as the CS pin is held low
(0). In Ready mode, the receiver is on, and the LIN
transmitter driver is off.
If CS = 1 when the VBB supply is turned on, the device
will proceed to Operation mode, or TXOFF (refer to
Figures 1-2 to 1-5), as soon as internal voltages
stabilize.
This pin may also be used as a local wake-up input
(refer to Example 1-1). In this implementation, the
microcontroller I/O controlling the CS should be
converted to a high-impedance input allowing the
internal pull-down resistor to keep CS low. An external
switch, or other source, can then wake-up both the
transceiver and the microcontroller (if powered). Refer
to Section 1.3 “Modes of Operation”, for detailed
operation of CS.
1.5.3
WAKE-UP INPUT (WAKE)
This pin is only available on the MCP2003/2003A.
The WAKE pin has an internal 800 kΩ pull-up to VBB.
A falling edge on the WAKE pin causes the device to
wake from Power-Down mode. Upon waking, the
MCP2003/3A will enter Ready mode.
Pin Name
8-Lead
PDIP,
SOIC
4x4
DFN
MCP2003/2003A
MCP2004/2004A
Normal Operation
Normal Operation
RXD
1
1
Receive Data Output (OD), HV
tolerant
Receive Data Output (OD),
HV tolerant
CS
2
2
Chip Select (TTL), HV tolerant
Chip Select/Local WAKE (TTL),
HV tolerant
WAKE
(MCP2003/2003A only)
3
3
Wake-up, HV tolerant
Fault Detect Output (OD)
Transmitter Enable (TTL)
HV tolerant
FAULT/TXE
(MCP2004/2004A only)
TXD
4
4
Transmit Data Input (TTL), HV
tolerant
Transmit Data Input (TTL), HV
tolerant
VSS
5
5
Ground
Ground
LBUS
6
6
LIN Bus (bidirectional)
LIN Bus (bidirectional)
VBB
7
7
Battery Positive
Battery Positive
VREN
8
8
Voltage Regulator Enable Output Voltage Regulator Enable Output
EP
9
Exposed Thermal Pad. Do not
electrically connect or connect to
Vss
Exposed Thermal Pad. Do not
electrically connect or connect to
Vss
Legend:
TTL = TTL Input Buffer; OD = Open-Drain Output
Note:
It is not recommended to tie CS high as
this can result in the device entering
Operation
mode
before
the
microcontroller is initialized and may
result in unintentional LIN traffic.


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