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7 Special Circuit Descriptions
7-4 SAM4S ER-380 SERIES
7-3 Battery, RTC(Clock), Buzzer, Cash Drawer and VFD Circuits
7-3-1 Battery Circuit
Battery Circuit supplies SRAMs and RTC (U136, RS5C372A) with voltage source and is used to drive clock and to
save data when the main Power is turned off. When the Power is turned on, VCC source(+5VDC) is supplied to
SRAMs and RTC through the D14(SK14), and the Battery is charged. When the Power is turned off, D14 is shut
and the source charged in the Battery is supplied to SRAM and RTC.
V108
DIODE-M4
D13
W hen Power On,
VBT Supply
VBT
100uF
C85
22uF/50V(DPP) s 100uF/16V(LPP2)
When Power On, Battery Charging
DIODE-SK14
D14
VCC
When Power Off,
VBT Supply
DIODE-SK14
D11
270
R91
DIODE-SK14
D12
BAT1
Figure 7-3 Battery Circuit
7-3-2 RTC(Clock) Circuit
This uses an Clock IC RS5C372A, is driven by the Battery when the main Power is turned off.
V88
V87
R81100
R80100
32.768KHz
X2
C68
22pF
3
SDA
6
OSCOUT
1
INTRB
8
VDD
2
SCL
4
VSS
7
OSCIN
5
INTRA
U13
RS5C372A
C63
22pF
RTC_SCLK
RTC_SDA
VBT
Figure 7-4 RTC Circuit
7-3-3 Buzzer Driving Circuit
The Buzzer is used to inform several kinds of states which occur under system operating and gives some information
to users by controlling the P8.0 pin of CPU. The frequency of buzzer is 2[KHz]
V86
R75
10K
AU1
BUZZER
R76
4.7K
VDRV
VCC
BUZZER
D9
MMBD6050LT1
R82
100
2
3
1
MMBT2222A
Q16
R79
100
Figure 7-5 Buzzer Circuit
42


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