Rainbow-electronics DS1500 Manual do Utilizador descarregar pdf (Página 10)

DS1500 Y2KC Watchdog RTC with Nonvolatile Control

10 of 19

Figure 7. Block Diagram

Figure 8. Typical Crystal Layout

CRYSTAL

X1

X2

GND

LOCAL GROUND PLANE (LAYER 2)

V

CCO

R

ST

P

WR

C

EO

256 x 8

NV SRAM

POWER CONTROL

WRITE PROTECTION,

AND POWER-ON

RESET

16 x 8

CLOCK AND CONTROL

REGISTERS

V

BAT

V

BAT

V

BAUX

GND

K

S

C

EI

A0–A4

DQ0–DQ7

C

S

W

E

O

E

X1

X2

32.768kHz CLOCK

OSCILLATOR

I

RQ

SQW

CLOCK ALARM AND WATCHDOG

COUNTDOWN

Dallas

Semiconductor

DS1500

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 18 19

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