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PDF M62055FP Data sheet ( Hoja de datos )
| Número de pieza | M62055FP | |
| Descripción | 3V POWER SUPPLY with WATCHDOG TIMER | |
| Fabricantes | Mitsubishi | |
| Logotipo |  |
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MITSUBISHI<Dig./Ana.INTERFACE>
M62055FP
3V POWER SUPPLY with WATCHDOG TIMER
GENERAL DESCRIPTION
M62055FP is a 3V power supply featuring a watchdog
timer function for a microcontroller system.
It can be a power source of 3V ± 5% by utilizing the
reference voltage and amplifier.
It can also generate a reset pulse for the applied
systems during power-on, moreover it includes the
watchdog timer for a self diagnostics of the system,
which can prevent system erroneous functions.
FEATURES
• Power-on reset
• Watchdock timer
• High accuracy voltage source of 3V ±5% (max)
• Overcurrent protection circuit
• The voltage detection accuracy of ±5% (max)
• Output power (Vo) cutoff function at erroneous
conditions
• Backward voltage protection circuits for inputs and
outputs
PIN CONFIGURATION(TOP VIEW)
GND
WD
TC
RESET
Vcc
CLM
VDD
VOC
Outline 8P2S
APPLICATION
Handy information terminal equipment, CD-ROM, Portable audio
equipment.
BLOCK
DIAGRAM
Vcc
CLM
Vcc
VOLTAGE DETECTOR
(CURRENT LIMITER)
START
CIRCUIT
VD VO
Vcc Vcc
The input and
output reversal
conservation circuit
56K
40K
Vref
=1.25v
Note ; It indicates Vo,
unless otherwise noted
Set priority
RQ
SQ
Vcc
Reset priority
RQ
SQ
.=.V0r.e9fv
RISE DELAY
(300µsec)
.=.1V.r2e5f v
.=V.1r.e5fv
.=V.1r.e5fv
Reset
priority
RQ
SQ
Reset
priority
SQ
RQ
Set priority
SQ
RQ
GND
WD
TC
MITSUBISHI
(1/6)
RESET
970508
1 page  
MITSUBISHI<Dig./Ana.INTERFACE>
M62055FP
3V POWER SUPPLY with WATCHDOG TIMER
DESCRIPTION of TERMS
tRST(1) Time from when TC begins to charge
until it reaches to VTH2(L).
tWD Time from when TC is VTH2(L) until it
reaches to VTH2(H).
tRST(2) Time from when TC is VTH2(H) until TC
starts charging.
1. Pin 3 (TC pin) Charging and discharging
time .
When an error is occurred in WD input,
TC waveform is as shown below.
VTH1(H)
Vo
0
output cutoff
VTH1(L)
=..0.9V
VTH2(H)
2. Pin 2 (WD pin) Input frequency,
input pulse width, charge/discharge
time .
When input of 2 WD is normal, TC waveform 3
is as shown below.
XV
Pin 3
t1 t2
VTH2(H) = 2.4v
VTH2(L) = 1.0v
Pin 2
tWDIN
t1 = C • R1 • ln 2
3-X
TC VTH2(L)
0
Inside delay time
tRST(1)
tWD
tRST(2)
t2 = 1000 • C • R1 • ln
X ( R1 + 1)
1000
R1 - 2
1000
-3
*1
tRST(1) = 0.406 • C • R1 + 300µs
tWD = 1.2 • C • R1
(Charging time)
VO = 3.0V
R1
3
C
Conditions of an input to pin 2 (WD pin)
(1) Input period should be tWD or less.
( Pin discharge is completed before the arrival
of VTH2(H) = 2.4 V )
1 <f
1.2 • C • R1
*1 : Inside delay time (Typical values)
(2) Input pulse width tWDIN should be t2 or less.
The following formula can be obtained because
tRST(2) is equal to the duration of Vo cutoff.
tRST(2)
=
C
•
*3
R•
ln
(
3
0.9
)
*2
+ 300µs
Al
C
*2
= 40 • C + 300µs
*2 : Inside delay time
(Typical values)
*3 : R = Internal resistance
cutoff Tr
MITSUBISHI
(5 / 6 )
970508
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet M62055FP.PDF ] | |
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