參數(shù)資料
型號(hào)： TC649EUATR
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO8
封裝： PLASTIC, MSOP-8
文件頁(yè)數(shù)： 25/28頁(yè)
文件大?。?/td> 478K
代理商： TC649EUATR
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.
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
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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