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MCP2025-330E/P bảng dữ liệu(PDF) 7 Page - Microchip Technology

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 2012-2014 Microchip Technology Inc.
DS20002306B-page 7
MCP2025
1.2.7
RESET
Reset output pin. This is an open-drain output pin. It
indicates the internal voltage has reached a valid,
stable level. As long as the internal voltage is valid
(above 0.8 VREG), this pin will present high impedance;
otherwise, the RESET pin switches to ground.
1.2.8
POSITIVE SUPPLY VOLTAGE
REGULATOR OUTPUT (VREG)
Positive Supply Voltage Regulator Output pin. An
on-chip Low Dropout Regulator (LDO) gives +5.0 or
+3.3V at 70 mA regulated voltage on this pin.
1.2.9
EXPOSED THERMAL PAD (EP)
There is an internal electrical connection between the
Exposed Thermal Pad (EP) and the VSS pin; they must
be connected to the same potential on the Printed
Circuit Board (PCB).
This pad can be connected to a PCB ground plane to
provide a larger heat sink. This improves the package
thermal resistance (
JA).
1.3
Fail-Safe Features
1.3.1
GENERAL FAIL-SAFE FEATURES
• An internal pull-down resistor on the CS/LWAKE
pin disables the transmitter if the pin is floating.
• An internal pull-up resistor on the TXD pin places
TXD in high and the LBUS in recessive if the TXD
pin is floating.
• High-Impedance and low-leakage current on LBUS
during loss of power or ground.
• The current limit on LBUS protects the transceiver
from being damaged if the pin is shorted to VBB.
1.3.2
THERMAL PROTECTION
The thermal protection circuit monitors the die
temperature and is able to shut down the LIN
transmitter and voltage regulator.
There are three causes for a thermal overload. A
thermal shutdown 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
The recovery time from the thermal shutdown is equal
to adequate cooling time.
Driving the TXD and checking the RXD pin make it
possible to determine whether there is a bus contention
(TXD = high, RXD = low) or a thermal overload
condition (TXD =low, RXD = high).
FIGURE 1-2:
THERMAL SHUTDOWN
STATE DIAGRAMS
1.3.3
TXD/LBUS TIME-OUT TIMER
The LIN bus can be driven to a dominant level, either
from the TXD pin or externally. An internal timer
deactivates the LBUS transmitter if a dominant status
(low) on the LIN bus lasts longer than Bus Dominant
Time-Out
Time,
tTO(LIN)
(approximately
20 milliseconds). At the same time, the RXD output is
put in recessive (high) and the internal pull-up resistor
between LBUS and VBB is disconnected. The timer is
reset on any recessive LBUS status or POR mode. The
recessive status on LBUS can be caused either by the
bus being externally pulled-up or by the TXD pin being
returned high.
1.4
Internal Voltage Regulator
The MCP2025 has a positive regulator capable of
supplying +5.00 or +3.30 VDC ±3% at up to 70 mA of
load current over the entire operating temperature
range of -40°C to +125°C. The regulator uses an LDO
design, is short-circuit-protected and will turn the
regulator output off if its output falls below the shutdown
voltage threshold, VSD.
With a load current of 70 mA, the minimum
input-to-output voltage differential required for the
output to remain in regulation is typically +0.5V (+1V
maximum over the full operating temperature range).
Quiescent current is less than 100 µA with a full 70 mA
load current
when
the
input-to-output
voltage
differential is greater than +3.00V.
Regarding the correlation between VBB, VREG and IDD,
please refer to Figures 1-4 and 1-5. When the input
voltage (VBB) drops below the differential needed to
provide stable regulation, the voltage regulator output,
VREG, will track the input down to approximately VOFF,
at which point the regulator will turn off the output. This
will allow PIC® microcontrollers with internal POR
circuits to generate a clean arming of the POR trip
point. The MCP2025 will then monitor VBB and turn on
the regulator when VBB is above the threshold of
regulator turn-on voltage, VON.
In Power-Down mode, the VBB monitor is turned off.
Voltage
Regulator
Shutdown
Operation
Mode
Transmitter
Shutdown
Output
Overload
LIN Bus
Shorted to
VBB
Temp < SHUTDOWNTEMP Temp < SHUTDOWNTEMP


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