Rainbow-electronics DS1500 Manual do Utilizador

1 of 19 REV: 030603 Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple rev

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 10 of 19 Figure 7. Block Diagram Figure 8. Typical Crystal Layo

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 11 of 19 DETAILED DESCRIPTION The RTC registers are double buffered into an internal and external

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 12 of 19 DATA RETENTION MODE The DS1500 is fully accessible and data can be written and read only

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 13 of 19 SETTING THE CLOCK It is recommended to halt updates to the external set of double buffer

DS1500 Y2K Watchdog RTC with Nonvolatile Control 14 of 19 The alarm can be programmed to activate on a specific day of the month, day of the week,

DS1500 Y2K Watchdog RTC with Nonvolatile Control 15 of 19 Control A Register (0Eh) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 BLF1 BLF2

DS1500 Y2K Watchdog RTC with Nonvolatile Control 16 of 19 Control B Register (0Fh) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 TE CS BME

DS1500 Y2K Watchdog RTC with Nonvolatile Control 17 of 19 regardless of the state of the watchdog enable (WDE) bit, to serve as an indication to th

DS1500 Y2K Watchdog RTC with Nonvolatile Control 18 of 19 If VCCI is applied within the timeout period, then the system power-on sequence continues

DS1500 Y2K Watchdog RTC with Nonvolatile Control 19 of 19 SELECTOR GUIDE PART NOMINAL VCC (V) TOP MARK DS1500YEN 5 DS1500Y N DS1500WEN 3.3 DS1500W

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 2 of 19 ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground -0.5V to +6.0VOpera

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 3 of 19 DC ELECTRICAL CHARACTERISTICS (VCC = 0V, TA = -40°C to +85°C.) PARAMETER SYMBOL CONDITION

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 4 of 19 AC OPERATING CHARACTERISTICS (continued) (VCCI = 3.3V ±10%, TA = -40°C to +85°C.) PARAMET

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 5 of 19 Figure 2. Write Cycle Timing, Write-Enable-Controlled Figure 3. Write

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 6 of 19 Figure 4. Burst Mode Timing Waveform A0–A4DQ0–DQ7 OE, WE, OR CS 13h PWHIGH PWLOW POWER-

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 7 of 19 Figure 5. 5V Power-Up/Down Waveform Timing OUTPUTS V CCI V PF(MAX) V PF(MIN) INPUTS HIG

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 8 of 19 WAKEUP/KICKSTART TIMING (TA = +25°C) (Figure 6) PARAMETER SYMBOL CONDITIONS MIN TYP MAX U

DS1500 Y2KC Watchdog RTC with Nonvolatile Control 9 of 19 PIN DESCRIPTION PIN NAME FUNCTION 1 SQW Square-Wave Output. When enabled, the SQW pin ou