H
參數(shù)資料
型號: 20-101-0732
廠商: Rabbit Semiconductor
文件頁數(shù): 49/126頁
文件大小: 0K
描述: INTERFACE SMART SCREEN OP7100
標準包裝: 1
系列: SBC
模塊/板類型: 單板計算機模塊
適用于相關(guān)產(chǎn)品: OP7100
其它名稱: 20-101-732
20-101-732-ND
OP7100
Hardware
29
Figure 3-3. OP7100 Power-Failure Detection Circuit
Since R34 >> RN2, the difference between V
H and VL, the hysteresis
voltage, would be 5 V × (R30/R34). For a nominal hysteresis voltage of
1.25 V, R
30 = 0.25 × R34.
Memory Protection
When /RESET is active, the ADM691 supervisor disables the RAM chip-
select line, preventing accidental writes.
Battery Backup
The backup battery protects data in the RAM and the real-time clock (RTC).
VRAM, the voltage supplied to the RAM and RTC, can also protect other
devices attached to the system against power failures. The ADM691 super-
visor switches VRAM to VBAT or VCC, whichever is greater. (To prevent
“hunting,” the switchover actually occurs when Vcc is 50 mV higher than
VBAT.)
The circuit draws no current from the battery once regular power is applied.
System Reset
The ADM691 chip drives the /RESET line. The /RESET line is not pulled
up internally.
DCIN
U28 Reg.
VCC
R30
29.4 kW
R29
4.99 kW
PFI to supervisor
VIN
VOUT
C44
47 F
U12 Supervisor
VBAT
WDI
PFI
VOUT
WDO
PFO
RST
INT1
R34
220 kW
RST
VCC
RN2
10 kW
+
+
=
+
+
=
R34
R30
R29
R30
1
V
3
.
1
V
RN2)
V(R34
1.3
V)
1.3
-
V
5
(
R30
R29
R30
1
V
3
.
1
V
H
L
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