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參數(shù)資料
| 型號(hào)： | ASM692ACSA |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | 0.150 INCH, SOIC-8 |
| 文件頁(yè)數(shù)： | 10/15頁(yè) |
| 文件大?。?/td> | 549K |
| 代理商： | ASM692ACSA |
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ASM690A/692A and ASM802L/802M and ASM805L
Rev. 2 | Page 4 of 15 | www.onsemi.com
Watchdog Input
As discussed in the Reset section, the Watchdog input is
used to monitor microprocessor activity. It can be used to
insure that the microprocessor is in a continually
responsive state by requiring that the WDI pin be toggled
every second. If the WDI pin is not toggled within the 1.6
second window (minimum tWD + tRS), a reset pulse will be
asserted to return the microprocessor to the initial start-
up state. Pulses as short as 50ns can be applied to the
WDI pin. If this feature is not used, the WDI pin should be
open circuited or the logic placed into a high-impedance
state to allow the pin to float.
Backup-Battery Switchover
A power loss can be made less severe if the system RAM
contents
are
preserved.
This
is
achieved
in
the
ASM690/692/802/805 by switching from the failed VCC to
an alternate power source connected at VBATT when VCC
is less than the reset threshold voltage (VCC < VRT), and
VCC is less than VBATT. The VOUT pin is normally
connected to VCC through a 2Ω PMOS switch but a
brown-out or loss of VCC will cause a switchover to VBATT
by means of a 20Ω
PMOS switch. Although both
conditions (VCC < VRT and VCC < VBATT) must occur for
the switchover to VBATT to occur, VOUT will be switched
back to VCC when VCC exceeds VRT irrespective of the
voltage at VBATT. It should be noted that an internal
device diode (D1 in Figure 3) will be forward biased if
VBATT exceeds VCC by more than a diode drop when VCC
is switched to VOUT. Because of this it is recommended
that VBATT be no greater than VRT +0.6V.
Condition
SW1/SW2
SW3/SW4
VCC > Reset Threshold
Open
Closed
VCC < Reset Threshold
VCC > VBATT
Open
Closed
VCC < Reset Threshold
VCC < VBATT
Closed
Open
ASM690A/802A/805L Reset Threshold = 4.65V
ASM692A /ASM802M Reset Threshold = 4.4V
Table 1. Pin Connections in Battery Backup Mode
Pin
Connection
VOUT
Connected to VBATT through internal
PMOS switch
VBATT
Connected to VOUT
PFI
Disabled
PFO
Logic-LOW
RESET
Logic-LOW (except on ASM805 where
it is HIGH)
WDI
Watchdog timer disabled
During the backup power mode, the internal circuitry of
the supervisory circuit draws power from the battery
supply. While VCC is still alive, the comparator circuits
remain alive and the current drawn by the device is
typically 35
μA. When VCC drops more than 1.1V below
VBATT, the internal switchover comparator, the PFI
comparator and WDI comparator will shut off, reducing
the quiescent current drawn by the IC to less than 1μA.
Backup Power Sources - Batteries
Battery voltage selection is important to insure that the
battery does not discharge through the parasitic device
diode D1 (see Figure 3) when VCC is less than VBATT and
VCC >VRT.
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