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MCP2025T-330E/SN bảng dữ liệu(PDF) 6 Page - Microchip Technology

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MCP2025
DS20002306B-page 6
 2012-2014 Microchip Technology Inc.
1.2
Pin Descriptions
The descriptions of the pins are listed in Table 1-2.
1.2.1
BATTERY POSITIVE SUPPLY
VOLTAGE (VBB)
Battery Positive Supply Voltage pin. An external diode
is connected in series to prevent the device from being
reversely powered (refer to Figure 1-7).
1.2.2
CHIP SELECT AND LOCAL
WAKE-UP INPUT (CS/LWAKE)
Chip Select and Local Wake-Up Input pin (TTL level,
high-voltage tolerant). This pin controls the device state
transition. Refer to Figure 1-1.
An internal pull-down resistor will keep the CS/LWAKE
pin low to ensure that no disruptive data will be present
on the bus while the microcontroller is executing a
Power-On Reset and I/O initialization sequence. When
CS/LWAKE is ‘1’, a weak pull-down (~600 kΩ) is used
to reduce current. When CS/LWAKE is ‘0’, a stronger
pull-down (~300 kΩ) is used to maintain the logic level.
This pin may also be used as a local wake-up input
(see Figure 1-7). The microcontroller will set the I/O pin
to control the CS/LWAKE. An external switch or
another source can then wake up both the transceiver
and the microcontroller.
1.2.3
GROUND (VSS)
Ground pin.
1.2.4
LIN BUS (LBUS)
LIN Bus pin. LBUS is a bidirectional LIN bus interface
pin and is controlled by the signal TXD. It has an open
collector output with a current limitation. To reduce
electromagnetic emission, the slopes during signal
changes are controlled and the LBUS pin has
corner-rounding control for both falling and rising
edges.
The internal LIN receiver observes the activities on the
LIN bus and generates the output signal RXD that
follows the state of the LBUS. A 1st degree 160 kHz
low-pass
input
filter
optimizes
electromagnetic
immunity.
1.2.5
RECEIVE DATA OUTPUT (RXD)
Receive Data Output pin. The RXD pin is a standard
CMOS output pin and it follows the state of the LBUS
pin.
1.2.6
TRANSMIT DATA INPUT (TXD)
Transmit Data Input pin (TTL level, HV-compliant,
adaptive pull-up). The transmitter reads the data
stream on the TXD pin and sends it to the LIN bus. The
LBUS pin is low (dominant) when TXD is low, and high
(recessive) when TXD is high.
TXD is internally pulled-up to approximately 4.2V. When
TXD is ‘0’, a weak pull-up (~900 kΩ) is used to reduce
current. When TXD is ‘1’, a stronger pull-up (~300 kΩ)
is used to maintain the logic level. A series
reverse-blocking diode allows applying TXD input
voltages greater than the internally generated 4.2V and
renders the TXD pin HV-compliant up to 30V (see
MCP2025 Block Diagram).
TABLE 1-2:
PIN FUNCTION TABLE
Pin Name
Pin Number
Pin Type
Description
8-lead PDIP
4x4 DFN
VBB
11
Power
Battery
CS/LWAKE
2
2
TTL input, HV-tolerant
Chip Select and Local Wake-up Input
VSS
33
Power
Ground
LBUS
4
4
I/O, HV
LIN Bus
RXD
5
5
Output
Receive Data Output
TXD
6
6
Input, HV-tolerant
Transmit Data Input
RESET
7
7
Open-drain output, HV-tolerant
Reset Output
VREG
8
8
Output
Voltage Regulator Output
EP
9
Exposed Thermal Pad
Note:
CS/LWAKE should NOT be tied directly to
the VREG pin, as this could force the
MCP2025 into Operation mode before the
microcontroller is initialized.


Số phần tương tự - MCP2025T-330E/SN

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