22 ELECTRICAL CHARACTERISTICS
22-4
Seiko Epson Corporation
S1C17651 TECHNICAL MANUAL
Current consumption-temperature characteristic
Current consumption-frequency characteristic
during execution with OSC3B + clock gear
during execution with OSC3B
OSC3B = ON (2MHz), OSC3A = OFF,
OSC3B = ON, OSC3A = OFF, OSC1A = 32.768kHz crystal,
OSC1A = 32.768kHz crystal, PCKEN[1:0] = 0x3, Typ. value
PCKEN[1:0] = 0x3, CCLKGR[1:0] = 0x2, Ta = 25°C, Typ. value
-50
800
700
600
500
400
300
200
100
0
-25
0
25
50
75
100
Ta [
°C]
IEXE3
[
A]
1/1
1/2
1/4
1/8
Gear ratio
0.0
700
600
500
400
300
200
100
0
0.5
1.0
1.5
2.0
2.5
fOSC3B [MHz]
IEXE3
[
A]
1/1
1/2
1/4
1/8
Gear ratio
Oscillation Characteristics
22.4
Oscillation characteristics change depending on conditions (board pattern, components used, etc.). Use the follow-
ing characteristics as reference values.
OSC1A crystal oscillation
Unless otherwise specified: VDD = 2.0 to 3.6V, VSS = 0V, Ta = 25°C, CG = built-in, CD = built-in, Rf = built-in, RD = built-in, CG1 = 3pF, CD1 = 3pF
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Oscillation start time *1
tsta
3
s
Built-in gate capacitance
CG
In case of the chip
10
pF
Built-in drain capacitance
CD
In case of the chip
5
pF
*1 Crystal resonator = C-002RX: manufactured by EPSON TOYOCOM (R1 = 50kW Max., CL = 7pF)
MC-146: manufactured by EPSON TOYOCOM (R1 = 65k
W Max., CL = 7pF)
OSC1B oscillation
Unless otherwise specified: VDD = 2.0 to 3.6V, VSS = 0V, Ta = 25°C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Oscillation start time
tsta
200
s
Oscillation frequency *1 *2
fOSC1B
Typ.
×
0.95
32.768
Typ.
×
1.05
kHz
Dependence of oscillation frequency on
temperature *2
TfOSC1B Frequency accuracy per
±1°C change in
temperature (with reference to 25°C)
±0.12
±0.3
%/°C
*1 In chip mounting, the value may exceed the range shown above according to the mount condition on the board.
*2 Reference value
OSC3A crystal oscillation
Unless otherwise specified: VDD = 2.0 to 3.6V, VSS = 0V, Ta = 25°C, Rf = built-in, RD = built-in, CG3 = 15pF, CD3 = 15pF
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Oscillation start time *1 *2
tsta
20.0
ms
*1 Crystal resonator = MA-406: manufactured by EPSON TOYOCOM
*2 The oscillation start time varies according to the crystal resonator used and the CG3 and CD3 values.
OSC3A ceramic oscillation
Unless otherwise specified: VDD = 2.0 to 3.6V, VSS = 0V, Ta = 25°C, Rf = built-in, RD = built-in
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Oscillation start time *1 *2
tsta
1.0
ms
*1 Ceramic resonator = CSTCC2M00G56-R0: manufactured by Murata Manufacturing Co., Ltd. (SMD, CG3 = CD3 = 47pF built-in)
CSTCR4M00G53-R0: manufactured by Murata Manufacturing Co., Ltd. (SMD, CG3 = CD3 = 15pF built-in)
CSTLS4M00G53-B0: manufactured by Murata Manufacturing Co., Ltd. (leaded, CG3 = CD3 = 15pF built-in)
*2 The oscillation start time varies according to the ceramic resonator used and the CG3 and CD3 values.