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PDF PST620 Data sheet ( Hoja de datos )
| Número de pieza | PST620 | |
| Descripción | (PST620 / PST621) System Reset | |
| Fabricantes | Mitsumi Electronics | |
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MITSUMI
System Reset (with battery back-up) PST620, 621
System Reset (with battery back-up)
Monolithic IC PST620, 621
Outline
These ICs are part of the regular series of back-up ICs, and use capacitors (super capacitor, large capacity
chemical capacitor) as back-up power supply. They control 1-chip microcomputer high-speed, low-speed,
and stand-by modes (MNI control).
These ICs also are capable of controlling data save in EPROM and other nonvolatile memories during power outage.
Features
1. Low current consumption
2. Capacitors (super capacitor, large capacity chemical capacitor) are used for back-up power supply, lowering
system cost
3. Stable 1-chip microcomputer crystal oscillator rise time maintained with the built-in pulse shaver.
4. In addition to power outage detection for main power supply (+5V), there are built-in pins to detect AC power
supply and +5V power supply primary side
5. Reset signal output by back-up power supply (super capacitor, large capacity chemical capacitor) detection
Package
DIP-8B (PST620DDB, PST621DDB)
SOP-8C (PST620DFT, PST621DFT)
Applications
1. VCR
2. Audio equipment
3. Communications equipment
4. Rice cookers, etc.
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Pin Assignment
8765
Pin Description
PST620
Pin No.
1
2
3
4
5
6
7
8
Pin name
VAC
VCC1
VCC2
TC
RE
PSCONT
CE
GND
1234
Function
Has +2.0V detection voltage to detect AC power supply and
stable power supply primary side, for quick power outage detection.
+5V main power supply
Back-up power supply (back-up capacitor connected)
Pulse width setting pin for pulse shaver
(capacitor and resistor connected)
Reset output
Pulse shaver ON/OFF switching High : OFF Low : ON
Chip enable signal output
GND
1 page  
MITSUMI
System Reset (with battery back-up) PST620, 621
Timing Chart
PST620
VCC1
4.2V
VCC2
2.15V
CE
TC
Delay
Delay
RE
AC power supply
Note : Connect VAC pin to VCC when not using.
AC rectifier or
regulator
primary side
CE
VTX
Note 1: VTH is set at 2.0V and hysteresis voltage at 90mV.
1. Use a resistor to divide the detected voltage so that it equals VTH when monitoring regulator
primary side power supply.
2. When monitoring AC voltage rectified as in the application circuit, set so that it equals VTH by
lowering the constant and dividing with a resistor. Refer to application circuit diagram.
Note 2: VAC input and VS1 are OR, so either signal makes CE low when power outage is detected.
PST621
AC
VCC1 4.2V
CE
MODE
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VCC2 3.1V
RESET
Application Circuits
VAC input : Power supply transformer secondary voltage detection
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet PST620.PDF ] | |
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