Rainbow-electronics DS17287 Bedienungsanleitung PDF herunterladen (Seite 20)

DS17285/DS17287

20 of 38

Figure 4. DS17285/DS17287 EXTENDED REGISTER BANK DEFINITION

BANK 0 BANK 1

MSB

DV0 = 0

LSB MSB

DV0 = 1

LSB

00 00

0D 0D

0E 0E

3F 3F

40 40 MODEL NUMBER BYTE

41 1ST BYTE SERIAL NUMBER

42 2ND BYTE SERIAL NUMBER

43 3RD BYTE SERIAL NUMBER

44 4TH BYTE SERIAL NUMBER

45 5TH BYTE SERIAL NUMBER

46 6TH BYTE SERIAL NUMBER

47 CRC BYTE

48 CENTURY BYTE

49 DATE ALARM

4A EXTENDED CONTROL REG 4A

4B EXTENDED CONTROL REG 4B

4C RESERVED

4D RESERVED

4E RTC ADDRESS - 2

4F RTC ADDRESS - 3

50 EXTENDED RAM ADDR - LSB EXTENDED

64 BYTES - USER RAM 51 EXTENDED RAM ADDR - MSB RAM

52 RESERVED 2k X 8

53 EXTENDED RAM DATA PORT

54 RESERVED

55 RESERVED

56 RESERVED

57 RESERVED

58 RESERVED

59 RESERVED

5A RESERVED

5B RESERVED

5C RESERVED

5D RESERVED

5E RTC WRITE COUNTER

RESERVED

7F 7F

TIMEKEEPING AND CONTROL

50 BYTES - USER RAM

TIMEKEEPING AND CONTROL

50 BYTES - USER RAM

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 37 38

DS17285/DS17287 1
3V/5V Real-Time Clock 1
ORDERING INFORMATION 2
PIN DESCRIPTION 2
DESCRIPTION 2
OPERATION 3
SIGNAL DESCRIPTIONS 3
Figure 1. BLOCK DIAGRAM 5
DS17285 ONLY 6
RTC ADDRESS MAP 7
CONTROL REGISTERS 9
REGISTER A 9
LSB 9
REGISTER B 10
REGISTER C 11
REGISTER D 11
NV RAM–RTC 12
INTERRUPT CONTROL 12
PERIODIC INTERRUPT SELECTION 13
OSCILLATOR CONTROL BITS 13
SQUARE-WAVE OUTPUT SELECTION 13
FREQUENCY 14
UPDATE CYCLE 15
EXTENDED FUNCTIONS 16
Silicon Serial Number 16
Century Counter 16
RTC Write Counter 16
Auxiliary Battery 17
Wake-Up/Kickstart 17
goes below V 18
RAM Clear 19
4k x 8 Extended RAM 19
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EXTENDED CONTROL REGISTERS 21
EXTENDED CONTROL REGISTER 4A 21
EXTENDED CONTROL REGISTER 4B 22
23 of 38 23
ABSOLUTE MAXIMUM RATINGS* 24
OPERATING RANGE 24
25 of 38 25
PWR Output at 0.4V 25
IRQ Output at 0.4V 25
CRYSTAL SPECIFICATIONS* 26
AC TEST CONDITIONS 27
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29
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CS High to Power-Fail 30
POWER-UP CONDITION, 3V 31
POWER-DOWN CONDITION, 3V 31
POWER-UP CONDITION, 5V 32
POWER-DOWN CONDITION, 5V 32
WAKE-UP/KICKSTART TIMING 33
BURST MODE TIMING WAVEFORM 34
DS17285 24-PIN DIP 35
DS17285 24-PIN SO 36
DS17285 28-PIN TSOP 37
DS17287 RTC PLUS RAM 38

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