E0C63454
q
Oscillation Characteristics
The oscillation characteristics change depending on the conditions (components used, board pattern, etc.). Use the follow-
ing characteristics as reference values.
OSC1 Crystal Oscillation Circuit
(Unless otherwise specified: V
DD
=3.0V, V
SS
=0V, f
OSC1
=32.768kHz, C
G
=25pF, C
D
=built-in, Ta=-20 to 70°C)
Characteristic
Symbol
Condition
Min.
Typ.
Max. Unit
Oscillation start voltage
Vsta
t
sta≤3sec (V
DD
)
1.8
V
(V
DD
)
Oscillation stop voltage
Vstp
t
stp≤10sec
1.8
V
Built-in capacitance (drain)
C
D
Including the parasitic capacitance inside the IC (in chip)
14
pF
Frequency/voltage deviation
∂f/∂V
V
DD
=2.2 to 6.4V
with VDC switching
5
ppm
without VDC switching
10
ppm
Frequency/IC deviation
∂f/∂IC
-10
10
ppm
Frequency adjustment range
∂f/∂C
G
C
G
=5 to 25pF
10
20
ppm
Harmonic oscillation start voltage V
hho
C
G
=5pF (V
DD
)
6.4
V
Permitted leak resistance
R
leak
Between OSC1 and V
SS
200
MΩ
OSC1 CR Oscillation Circuit
(Unless otherwise specified: V
DD
=3.0V, V
SS
=0V, R
CR1
=520kΩ, Ta=-20 to 70°C)
Characteristic
Symbol
Condition
Min.
Typ.
Max. Unit
Oscillation frequency dispersion
f
OSC1
-30
30
%
60kHz
Oscillation start voltage
2.2
V
Vsta (V
DD
)
Oscillation start time
t
sta V
DD
=2.2 to 6.4V
3
mS
Oscillation stop voltage
Vstp (V
DD
)
2.2
V
OSC3 Ceramic Oscillation Circuit
Characteristic
Oscillation start voltage
Oscillation start time
Oscillation stop voltage
(Unless otherwise specified: V
DD
=3.0V, V
SS
=0V, Ceramic oscillator: 4MHz, C
GC
=C
DC
=30pF, Ta=-20 to 70°C)
Symbol
Condition
Min.
Typ.
Max. Unit
Vsta (V
DD
)
2.2
V
t
sta V
DD
=2.2 to 6.4V
5
mS
Vstp (V
DD
)
2.2
V
OSC3 CR Oscillation Circuit
(Unless otherwise specified: V
DD
=3.0V, V
SS
=0V, R
CR2
=34kΩ, Ta=-20 to 70°C)
Characteristic
Symbol
Condition
Min.
Typ.
Max. Unit
Oscillation frequency dispersion
f
OSC3
-25 1,800kHz 25
%
Oscillation start voltage
2.2
Vsta (V
DD
)
V
Oscillation start time
t
sta V
DD
=2.2 to 6.4V
3
mS
Oscillation stop voltage
2.2
Vstp (V
DD
)
V
• OSC1 CR oscillation frequency-resistance
characteristic
120k
110k
• OSC3 CR oscillation frequency-resistance
characteristic
2.2M
2.1M
2.0M
CR oscillation frequency f
OSC1
[Hz]
100k
90k
80k
70k
60k
50k
40k
30k
20k
CR oscillation frequency f
OSC3
[Hz]
V
DD
= 2.2 to 6.4 V
V
SS
= 0 V
Ta = 25°C
Typ. value
V
DD
= 2.2 to 6.4 V
V
SS
= 0 V
Ta = 25°C
Typ. value
1.9M
1.8M
1.7M
1.6M
1.5M
1.4M
1.3M
1.2M
1.1M
300k
400k
500k
600k
700k
800k
900k
1M
1.0M
0.9M
20k
30k
40k
50k
60k
70k
80k
90k
100k
110k
120k
Resistor value for CR oscillation R
CR1
[Ω]
Resistor value for CR oscillation R
CR2
[Ω]
6
SEIKO [ SEIKO EPSON CORPORATION ]
