Battery, Buzzer And Cash Drawer Circuits; Battery Circuit; Buzzer Driving Circuit - Sam4s ER-5200 Service Manual

7 Special Circuit Descriptions
7-3

Battery, Buzzer and Cash Drawer Circuits

7-3-1 Battery Circuit

Battery Circuit supplies SRAM and RTC (U26, RF5C15) 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 D128(SK14), and the Battery is charged. When the Power is turned off, D28 is shut and the source
charged in the Battery is supplied to SRAM and RTC.

7-3-2 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]
7-4
Figure 7-4 Battery Circuit
Figure 7-5 Buzzer Circuit
SAM4S ER-5200 Series