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參數(shù)資料
| 型號(hào)： | BA6162F |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Reset IC with battery backup function |
| 中文描述： | 復(fù)位IC與電池備份功能 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大小： | 108K |
| 代理商： | BA6162F |
6
Memory ICs
BA6129AF / BA6162 / BA6162F
Circuit operation
These ICs have two distinct functions, a logic output function and a power supply switching function.
The logic output circuit consists of the following:
(1) Reset output (NPN Tr open collector)
(2) CS output
(PNP Tr open collector + pull-down resistor)
(3) CSB output (NPN Tr open collector + pull-up resistor)
The power supply switching circuit consists of a PNP
power transistor and an SBD (Schottky barrier diode).
The normal power supply V
CC
and the battery backup
power supply (V
BAT
) are both connected to the switch-
ing circuit. When the PNP power transistor is turned on
and off, the IC power is switched from the normal
power supply to the battery backup power supply, and
vice versa.
The power supply voltage detection circuit consists of a
standard voltage source V
REF
and a hysteresis com-
parator. The power supply V
CC
is detected using a split
resistance. When the power supply voltage drops
below the detection voltage (BA6129AF: V
S
= 3.5Vtyp.
when V
CC
drops and V
S
+ 0.1Vtyp. when V
CC
rises;
BA6162 / F: V
S
= 4.2Vtyp. when V
CC
drops, and V
S
+
0.1Vtyp. when V
CC
rises), the Reset signal (Low) and
the CS signal (CS-Low, CSB-High) are output by the
logic output function, and the SRAM (or other memory
device) is switched to backup mode.
If the power supply V
CC
drops further and goes below
the switching voltage (BA6129AF and BA6162 / F: V
B
=
3.3Vtyp. when V
CC
drops, V
B
+ 0.1Vtyp. when V
CC
rises), the SBD develops a forward bias because the
PNP power transistor is off. The power supply output
V
O
switches from the power supply V
CC
to the battery
power supply (V
BAT
).
When the normal power supply V
CC
rises, the above
process is reversed.
Fig. 2 Timing chart
V
CC
V
O
RESET
CSB
CS
5V
V
S
[3.5V
Typ.
]
[4.2V
Typ.
]
V
B
[3.3V
Typ.
]
OV
V
O (Vcc)
(
BA6129AF
) (
BA6162 / F
)
[
6
GND]
[
6
V
CC
]
[
6
GND]
[
6
GND]
OV
V
RESH
V
RESL
V
CSH
V
CSL
V
CSBH
V
CSBL
[5V—V
SAT1
]
[3V—V
SAT2
]
[
6
V
CC
]
[
6
V
O
]
V
O (BAT)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BA6162F-E2 | 功能描述:監(jiān)控電路 IC W/BACKUP 7V RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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| BA6195 | 制造商:ROHM 制造商全稱:Rohm 功能描述:1-channel BTL driver for CD players |
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