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TC646VUA Arkusz danych(PDF) 7 Page - Microchip Technology

Numer części TC646VUA
Szczegółowy opis  PWM Fan Speed Controller with Auto-Shutdown and FanSense??Technology
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Producent  MICROCHIP [Microchip Technology]
Strona internetowa  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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 2002 Microchip Technology Inc.
DS21446C-page 7
TC646
FIGURE 3-1:
TC646 Nominal Operation.
3.7
Shutdown Mode (Reset)
If an unconditional shutdown and/or device reset is
desired, the TC646 may be placed in shutdown mode
by forcing VIN to a logic low (i.e., VIN < VSHDN) (see
Figure 3-1). In this mode, all functions cease and the
FAULT output is unconditionally inactive. The TC646
should not be shut down unless all heat producing
activity in the system is at a negligible level. The TC646
exits shutdown mode when VIN becomes greater than
VREL, the release voltage.
Entering shutdown mode also performs a complete
device reset. Shutdown mode resets the TC646 into its
power-up state. The Start-up and Fault Timers, and any
current faults, are cleared. FAULT is unconditionally
inactive in shutdown mode. Upon exiting shutdown
mode (VIN > VREL), the Start-up Timer will be triggered
and normal operation will resume, assuming no fault
conditions exist and VIN > VAS + VHAS
If a fan fault has occurred and the device has latched
itself into shutdown mode, performing a reset will not
clear the fault unless VIN > (VAS + VHAS). If VIN is not
greater than (VAS + VHAS) upon exiting shutdown
mode, the fan will not be restarted. Consequently, there
is no way to establish that the fan fault has been
cleared. To ensure that a complete reset takes place,
the user’s circuitry must ensure that VIN > (VAS + VHAS)
when the device is released from shutdown mode. A
recommended algorithm for management of the TC646
by a host microcontroller or other external circuitry is
given in Section 5.0, “Typical Applications”. A small
amount of hysteresis, typically one percent of VDD
(50 mV at VDD = 5.0V), is designed into the VSHDN/
VREL threshold. The levels specified for VSHDN and
VREL in Section 1.0, “Electrical Characteristics”,
include this hysteresis plus adequate margin to
account for normal variations in the absolute value of
the threshold and hysteresis.
2.6V
VAS + VHAS
VIN
tRESET
VREL
VSHDN
VAS
1.2V
TC646
Status
Normal
Operation
Auto-Shutdown
Mode
Normal
Operation
Shut-
Down
Normal
Operation
GND
Time
TEMP.
HI
LO
Note: If VIN < VAS when the device exits shutdown
mode, the fan will not restart as it will be in auto-shut-
down mode.
CAUTION: Shutdown mode is unconditional. That is,
the fan will remain off as long as the VIN pin is being
held low or VIN < VAS + VHAS.


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