Zakładka z wyszukiwarką danych komponentów |
|
TC646VUA Arkusz danych(PDF) 7 Page - Microchip Technology |
|
TC646VUA Arkusz danych(HTML) 7 Page - Microchip Technology |
7 / 28 page 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. |
Podobny numer części - TC646VUA |
|
Podobny opis - TC646VUA |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |