SAMSUNG DIGIMAX MS15 Circuit Description
Samsung Electronics 13-1
13. Circuit Operating Description
13-1 Introduction to the product
13-1-1 Introduction
Miniket Photo is a digital camera equipped with a 5.25M CCD, and is capable of recording MPEG4 movies at
30fps in VGA. It is a multi-function gadget that can be used as a MP3 Player, a Mass Storage, a PC Camera
(webcam) and a Voice Recoder. This product has a memory slot for Mini-SD Card, and can be recharged
using a USB cable.
13-1-2 MICOM
1) MICOM CHIP FEATURE
ΠMICOM P/N : uPD78F0078Y
´ MAIN Clock : 8.38 MHz
ˇ MICOM Characteristics :
- 52 I/O port
- 8 channel 10 bit A/D port
- 4 channel serial port(2-channel UART, 2-channel 3wire)
- 1 channel IIC
- 6 channel Timer
- 26 vector interrupt
2) Control and Operating Description
Miniket Photo uses an 8-bit MICOM(uPD78F0078Y) to control "Key" inputs and for power
management. Its main clock runs at 8.38MHz; and rather than using 32.768KHz subsystem clock, a Real-Time
Clock(RTC) IC (RS5C372A) is connected to its I2C bus. Since Miniket Photo supports both Normal-Mode and
Stop-Mode, and a RTC IC is used to suspend all operations in the Stop Mode while power is supplied to the
MICOM. This will enhance the efficiency of limited battery capacity.
♦ SLEEP(HALT) MODE
In Wait State, Power Save Mode
- Stop Main Clock
- Stop Sub Clock -> System Clock and RTC Clock are used simultaneously
♦ STOP MODE
All operations are in suspend state. Voltage is being supplied and up to the last operation data
is stored in RAM
- Stop Main and Sub Clock
Circuit Operating Description
13-2 Samsung Electronics
2) RESET Circuit diagram
Fig 13-1
TPS65520 2.9V Regulator
Back up Batter y 3.0V
Batter y/AC Adpter 3.6V
TPS65520 MICOM Reset
RTC
RS5C372
A
MENUAL RESET
RESET
Circuit Operating Description
Samsung Electronics 13-3
3) MICOM and KEY CONTROL
Keys are controlled by MICOM. To use less MICOM ports, voltage dividing method is used and the voltage
values are inputted into MICOM's AD ports. AD Values are as shown below.
Table 13-1
MICOM
NO
PIN PORT
NO NAME MACRO
1
32 ANI 1 8WAY_AD2
5
31 ANI 2 8WAY_AD1
9
28 ANI 5 KEY_AD2
15
27 ANI 6 KEY_AD1
VOLTAGE Level
(2.9V base)
KEY NAME
TES18.1
EGAROTS51.12
MACCP16.03
REDROCERECIOV04
BMD18.1
3PM51.16
GEPM16.07
CSD08
UNEM0
YALPSID16.001
4YEKTOH51.111
3YEKTOH37.121
2YEKTOH43.231
1YEKTOH36.241
RETNE0
TFEL43.261
THGIR37.171
PU16.081
NWOD51.191
Circuit Operating Description
13-4 Samsung Electronics
Fig 13-2
A/V JACK
B/T SHUTTER
B/T POWER_ON & PWR_LED
ZOOM_TELE
ZOOM_WIDE
ASSY POWER
8WAY MODE DIAL
USB JACK
DC JACK
ASSY MODE DIAL
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