22 ELECTRICAL CHARACTERISTICS
22-6
Seiko Epson Corporation
S1C31D50/D51 TECHNICAL MANUAL
(Rev. 2.00)
IOSC oscillation frequency-temperature characteristic
V
DD
= 1.8 to 5.5 V, PWGACTL.REGSEL bit = 1, Typ. value
V
DD
= 1.8 to 5.5 V, PWGACTL.REGSEL bit = 0, Typ. value
-50
9
8
7
6
5
4
3
2
1
0
-25
0
25
50
75
100
Ta [
°
C]
f
IOSC
[k
Hz
]
CLGIOSC.IOSCFQ[1:0] bits = 0x2
0x1
0x0
-50
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-25
0
25
50
75
100
Ta [
°
C]
f
IOSC
[k
Hz
]
CLGIOSC.IOSCFQ[1:0] bits = 0x1
0x0
OSC1 oscillator circuit characteristics
Unless otherwise specified: V
DD
= 1.8 to 5.5 V, V
SS
= 0 V, Ta = 25
°
C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Crystal oscillator
oscillation start time
*
1
t
sta1C
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.INV1N[1:0] bits = 0x1,
CLGOSC1.INV1B[1:0] bits = 0x2,
CLGOSC1.OSC1BUP bit = 1
–
–
3
s
Crystal oscillator
internal gate capacitance
C
GI1C
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.CGI1[2:0] bits = 0x0
–
12
–
pF
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.CGI1[2:0] bits = 0x1
–
14
–
pF
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.CGI1[2:0] bits = 0x2
–
16
–
pF
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.CGI1[2:0] bits = 0x3
–
18
–
pF
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.CGI1[2:0] bits = 0x4
–
19
–
pF
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.CGI1[2:0] bits = 0x5
–
21
–
pF
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.CGI1[2:0] bits = 0x6
–
23
–
pF
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.CGI1[2:0] bits = 0x7
–
24
–
pF
Crystal oscillator
internal drain capacitance
C
DI1C
CLGOSC1.OSC1SELCR bit = 0,
–
6
–
pF
Crystal oscillator
oscillator circuit
current - oscillation inverter
drivability ratio
*
1
I
OSC1C
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.INV1N/INV1B[1:0] bits = 0x0
–
70
–
%
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.INV1N/INV1B[1:0] bits = 0x1 (reference)
–
100
–
%
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.INV1N/INV1B[1:0] bits = 0x2
–
130
–
%
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.INV1N/INV1B[1:0] bits = 0x3
–
300
–
%
Crystal oscillator
oscillation stop detector current
I
OSD1C
CLGOSC1.OSC1SELCR bit = 0,
CLGOSC1.OSDEN bit = 1
–
0.025
0.1
µA
Internal oscillator
oscillation start time
t
sta1I
CLGOSC1.OSC1SELCR bit = 1
–
–
100
µs
Internal oscillator
oscillation frequency
f
OSC1I
CLGOSC1.OSC1SELCR bit = 1
31.04
32
32.96
kHz
*
1 CLGOSC1.CGI1[2:0] bits = 0x0, Crystal resonator = C-002RX (manufactured by Seiko Epson Corporation, R
1
= 50 k
W
(Max.), C
L
= 7 pF)