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參數(shù)資料
| 型號： | TC649VUATR |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 25/28頁 |
| 文件大?。?/td> | 478K |
| 代理商： | TC649VUATR |
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TC649
DS21449C-page 6
2002 Microchip Technology Inc.
FIGURE 3-1:
TC649 Nominal Operation.
3.7
Shutdown Mode (RESET)
If an unconditional shutdown and/or device reset is
desired, the TC649 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 TC649
should not be shut down unless all heat producing activ-
ity in the system is at a negligible level. The TC649 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 TC649 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, and there will be 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 TC649 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 (50mV at VDD
= 5.0V), is designed into the VSHDN/VREL threshold.
“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
TC649
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 shut-
down mode, the fan will not restart, but will
be in auto-shutdown mode.
CAUTION: The fan will remain off as long as the VIN
pin is being held low or VIN < VAS+ VHAS.
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