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TC653AAVUA Folha de dados(PDF) 6 Page - Microchip Technology

Nome de Peças TC653AAVUA
Descrição Electrónicos  Integrated Temperature Sensor & Brushless DC Fan Controller
Download  14 Pages
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC653AAVUA Folha de dados(HTML) 6 Page - Microchip Technology

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TC652/TC653
DS21453B-page 6
© 2002 Microchip Technology Inc.
3.2
Start-Up Timer
To ensure reliable fan start-up, the Start-up Timer turns
PWM high for about 2 seconds whenever the fan is
started from the off state. This occurs at power-up and
when coming out of Shutdown mode.
3.3
SENSE Input
(FanSense™ Technology)
The SENSE input, Pin 5, is connected to a low value
current sensing resistor in the ground return leg of the
fan circuit through the capacitor. During normal fan
operation, commutation occurs as each pole of the fan
is energized. This causes brief interruptions in the fan
current, seen as pulses across the sense resistor. If the
device is not in Shutdown mode, and pulses are not
appearing at the SENSE input, a FAULT exists. The
short, rapid change in fan current (high di/dt) causes a
corresponding dv/dt across the sense resistor, RSENSE.
The waveform on RSENSE is differentiated and con-
verted to a logic-level pulse-train by CSENSE and the
internal signal processing circuitry. The presence and
frequency of this pulse-train is a direct indication of fan
operation.
3.4
FAULT
This pin goes low to indicate a fan FAULT condition.
Pulses appearing at SENSE pin due to the PWM turn-
ing on are blanked and the remaining pulses are
filtered by a Missing Pulse Detector. If consecutive
pulses are not detected for 32 PWM cycles (about 2
sec), the PWM is Low and FAULT goes low. FAULT can
be disabled by momentarily toggling SHDN or VDD pin,
or cycling system power. FAULT remains high during
Shutdown mode.
3.5
Over-Temperature Alert (TOVER)
This pin goes low when the TH set point is exceeded
by 10°C (typical). This indicates that the fan is at
maximum drive, and the potential exists for system
overheating: either heat dissipation in the system has
gone beyond the cooling system's design limits, or
some FAULT exists such as fan bearing failure or an
airflow obstruction. This output may be treated as a
“System Overheat” warning and used to trigger system
shutdown, or bring other fans to full speed in the
system. The fan will continue to run at 100% speed
while TOVER is asserted. Built-in hysteresis prevents
TOVER from “chattering” when measured temperature
is at or near the TH + 10°C trip point. As temperature
falls through the TH + 10°C trip point, hysteresis
maintains the TOVER output low until measured
temperature is 5°C above the trip point setting.
3.6
Shutdown (SHDN)
The fan can be unconditionally shutdown by pulling low
the SHDN pin. During shutdown, FAULT output is high
and PWM output is low. This is ideal for notebook
computers and other portable applications when you
need to change batteries and must not have the fan
running at that time. Thermal monitoring and TOVER are
still in operation during shutdown. IDD shutdown current
is around 50
µA.
3.7
Auto-Shutdown Mode
The TC653 has auto-shutdown. If the temperature is
below the factory set point at minimum speed (TL),
PWM is low and the fan is automatically shut off (Auto-
shutdown mode). This feature is ideal for notebook
computers and other portable applications that need to
conserve as much battery power as possible and thus
run a fan when it is only absolutely needed. The TC653
will continue to be active so as to monitor temperature
for TOVER. The TC653 exits Auto-shutdown mode
when the temperature rises above the factory set point
(T1).
3.8
Temperature Selection Guide
(Minimum Fan Speed/Full Speed)
The five temperature regions defined by the six
thresholds are defined in the TC652/TC653 by means
of factory trimming. Once a TL and TH are set, the T1
T4 thresholds are automatically equally spaced
between TL and TH.


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