MITSUMI
System Reset PST573
Timing Chart
7
6
5
4
3
2
1
0
V
CC
V
OUT
V
S
(CPU)
V
S
V
CC
/V
OUT
(V)
Time
RESET
ON
OFF
Undefined
Application circuits
1. Normal hard reset
Delay time (tpLH)
V
CC
-0.2
. C
=
L
R
L
ln
.
Vscpu
C
L
: µF
[
]
+0.025 (mS)
Reset threshold voltage of
CPU, MPU, etc.
R
L
: kΩ
Vs cpu :
Voltage: V
Note: Connect a capacitor between IC pins 1 and 2
if V
CC
line impedance is high.
2. Manual reset added
Note 1: Use R
L
, C
L
and Rm to prevent manual switch
chattering.
Note that Rm should be set to the following
conditions.
Rm < 1/20R
L
=
Note 2: Connect a capacitor between IC pins 1 and 2
if V
CC
line impedance is high.
3. Battery checker (LED ON for high voltage)
Note: Connect a capacitor between IC pins 1 and 2 if
V
CC
line impedance is high.
MITSUMI [ MITSUMI ELECTRONICS, CORP. ]
