DS12R885-DS12CR887-DS12R887_cn

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DS12R885 DS12885 (RTC) ? ? RTC/ ? ? ? ? ? ? 114 ? RAM ? 31 ? ? ? ??? 24 AM/PM 12 ? ?? V CC ? ? ? ? ?V BACKUP ? ? ?? ?DS12R885 ? Intel Motorola ?DS12CR887 D S 12R 887 D S 12R 885 ?

_________________________________

??

? ?

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? ? ? Intel Motorola ?RTC ? ? ? ? ? ? ?? 2100 ? ? ?

? ?122μs 500ms ? ? ?14 ?114 0 RAM ? ? ?

? ? ?+5.0V +3.3V ?

?DS12CR887 DIP (EDIP)

?DS12R887BGA ? ?

DS12R885/DS12CR887/DS12R887

RTC

______________________________________________Maxim Integrated Products

1

__________________________

Rev 4; 5/06

? Maxim ?Maxim ? ? ? ? ? ? ? Maxim ? ?

? ? Maxim ǖhttps://www.360docs.net/doc/44438297.html, ?

?

______________________________

D S 12R 885/D S 12C R 887/D S 12R 887

RTC

2

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ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Voltage Range on V CC Pin Relative to Ground.....-0.3V to +6.0V Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range.............................-55°C to +125°C Soldering Temperature.......................................See IPC/JEDEC

J-STD-020A Specification

Soldering Temperature (leads, 10s)................................+260°C

DS12R885/DS12CR887/DS12R887

RTC

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3

AC ELECTRICAL CHARACTERISTICS

D S 12R 885/D S 12C R 887/D S 12R 887

RTC

4

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AC ELECTRICAL CHARACTERISTICS

DS12R885/DS12CR887/DS12R887

RTC

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5

__________________________________________________________Motorola /

_____________________________________________________________________________Intel

D S 12R 885/D S 12C R 887/D S 12R 887

RTC

6

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___________________________________________________________________Intel

______________________IRQ

____________________________________________________________________ /

DS12R885/DS12CR887/DS12R887

RTC

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7

POWER-UP/POWER-DOWN CHARACTERISTICS

CAPACITANCE

WARNING:Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data.

Note 1:Limits at -40°C are guaranteed by design and not production tested.Note 2:All voltages are referenced to ground.Note 3:All outputs are open.

Note 4:Specified with CS = DS = R/W =RESET = V CC ; MOT, AS, AD0–AD7 = 0; V BACKUP open.

Note 5:Applies to the AD0 to AD7 pins, the IRQ pin, and the SQW pin when each is in a high-impedance state.Note 6:The MOT pin has an internal 20k Ωpulldown.

Note 7:Measured with a 32.768kHz crystal attached to X1 and X2.Note 8:Measured with a 50pF capacitance load.

Note 9:

Guaranteed by design. Not production tested.

D S 12R 885/D S 12C R 887/D S 12R 887

RTC

8

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(V CC = +3.3V, T A = +25°C, unless otherwise noted.)

OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE

D S 12R 885 t o c 04

SUPPLY (V)

F R E Q U E N C Y (H z )

5.0

4.5

3.5

4.0

3.0

2.5

32767.9232767.9432767.9632767.9832768.0032768.0232768.0432768.0632768.0832768.10

32767.90

2.0

5.5

I BACKUP vs. TEMPERATURE

(DS12R885)

TEMPERATURE (°C)

S U P P L Y C U R R E N T (n A )

65

50

-25-10

5

20

35

475500525550575600625650450

-4080

V BACKUP vs. V CC vs. I BACKUP

(DS12R885)

DS12R885 toc02

V CC

V B A C K U P

5.04.54.03.53.02.52.01.52.2

2.4

2.6

2.8

3.0

2.0

1.0 5.5

0μA -15μA -30μA -45μA

-60μA

I BACKUP vs. V BACKUP

(DS12R885)

D S 12R 885 t o c 01

V BACKUP (V)

S U P P L Y C U R R E N T (n A )

2.8

2.52.3

575

600

625

550

2.0

3.0

V CC = 0V

DS12R885/DS12CR887/DS12R887 RTC

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D S 12R 885/D S 12C R 887/D S 12R 887

RTC

10

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DS12R885/DS12CR887/DS12R887

RTC

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11

D S 12R 885/D S 12C R 887/D S 12R 887

RTC

12

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DS12R885 DS12885RTC ? ? 14 / ? ? / 114 ? ? RAM ? ? ? ? ? ? ?DS12R885 24 AM/PM 12 ? ?? V CC ? ? ? ? ?? ? ? ?? ? ? / DS12R885? Intel Motorola ?DS12R887 DS12R885 ?32.768kHz ? ? / ? ? ? ? ? ? 114 ? ? RAM ? 31 ? ? ? ??? 24 AM/PM 12 ? ?? V CC ? ? ? ? ? ? I/O ? I/O Intel Motorola ?

DS12CR887 EDIP DS12R885 ? ?DS12R885 ? ? V CC +25°C ? ? ?

DS12R887 BGA ? ? V CC (+25°C ? ) 11 ( 10% ) 98 ( 90% )? 10%? 1000 ? 90%? 30 ? ? 30 (11 x 1000 * 8 (98 x 30 )? V CC ? ?

? ? ? ? ?

____________________________

DS12R885 ?32.768kHz ? ? ??1 ? ? 1? ? ?PCB ? ? ESR ? ? ? ? ? ? ?? ? 1 ?

?32.768kHz DS12R885? ?X1 ?X2 ?

1. ? ?

? *

DS12R885/DS12CR887/DS12R887

RTC

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13

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? ? ?? ? ? 2 PCB ? ? ? ? 58ǖCrystal Con sideration s with Dallas Real-Time Clocks (RTCs)?

DS12R887 DS12CR887 ? ? t DR ? ?+25°C ? ±1 ?

_____________________ /

V CC ? ?RAM ? ? V CC ?V BACKUP ? ? ? V CC ? V PF ( )?? t REC ? ? ( A)? ? ? ? ?? ?

?

____________________________

? ? ? ? 10 ? BCD ?

? 1 7? ? 1? ? 31 ? ? ? ??? ? ? ? B SET 1? ?

? ( BCD ) 10 ? ? B (DM)? ? 10 ? ? ? ? B SET 0? RTC ? ?RTC ? 10 ? ??2A 2B ? BCD ?

?? 24-12 ? 12 ? 1 ?PM ? ? ? ? ? ? ? ?

? ? ? ? ? ? ? ? ?? ? ? ?

2. ?

D S 12R 885/D S 12C R 887/D S 12R 887

RTC

14

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? ? ? ? ? ? ? ? ?0? ? 0( ?2A 2B)? / ?0? 1 ? ? ?

? ? ? ? C0 FF ? 1

? ? ? ? ? ? ? ? ? ? ? ? 128 ? ǖ1) C D ?2) A 7 ?3) MSB ?

ǖ ? ? ? 0 1? ? ? ? 0 0?

DS12R885/DS12CR887/DS12R887

RTC

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15

ǖ ? ? ? 0 1? ? ? ? 0 0?

D S 12R 885/D S 12C R 887/D S 12R 887

RTC

16

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UIP 1 ? ?UIP 0 ? 244μs ? ?UIP 0 ?RAM ? ?UIP ? ? RESET ? B SET 1 ? ? UIP ?

6?5?4 ǖDV2?DV1?DV0? ? ?? ?010 ? RTC ?11X ? ? ?010 DV0?DV1?DV2 500ms ?

15 13 ?? ? ? (SWQ ) / ? ? ǖ1) PIE ǘ2) SQWE SQW ǘ3) ?? ǘ

4) ?

?3 RS ? ? / ? RESET ?

A

____________________________

DS12R885 4 ? ? ?

DS12R885/DS12CR887/DS12R887

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7 ǖSET ?SET 0 ? ? ? 1?SET 1 ? ? ? ? ? ?SET / ?? RESET DS12R885 ? ? 6 ǖ (PIE)?PIE / ? C ? (PF) IRQ ?PIE 1 ? A RS3–RS0 IRQ ??? ?PIE 0 ? IRQ ? PF ?PIE ? DS12R885 ? ? RESET 0?

5 ǖ (AIE)?AIE / ? 1 ? C ? (AF) ? IRQ ? ( ? 11XXXXXX )? ? ? AIE 0?AF ?? IRQ ?AIE ? DS12R885 ? ? RESET 0?

4 ǖ (UIE)?UIE / ? C ? (UF) ? IRQ ?RESET ? SET ? UIE ?UIE ? DS12R88

5 ? ? RESET 0?

3 ǖ ? (SQWE)? 1 ?SQW ? ? A RS3–RS0 ?SQWE 0 ?SQW ? ?SQWE / ? RESET ? SQW ? V CC V PF ?? ?RESET SQWE 0?

2 ǖ (DM)? ? BCD ?DM ? ? ? DS12R885 ? RESET ?DM 1 ? ? 0 ?BCD ?

1 ǖ24/12?24/1

2 ?1 ?24 ?0 ?12 ? / ?? DS12R885 ? RESET ?

0 ǖ (DSE)?DSE / ? 1 ? ? ? 1:59:59AM 3:00:00AM ? ? 1:59:59AM ? 1:00:00AM ? DSE ? ? / ? DSE ? ? ? D S E 0 ? ? ? ? DS12R885 ? RESET

?

B

RTC

D S 12R 885/D S 12C R 887/D S 12R 887

18

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7 ǖ ? (IRQF)? ? 1ǖPF = PIE = 1AF = AIE = 1UF = UIE = 1

IRQF 1 ?IRQ ? ? C RESET ?

6 ǖ ? (PF)? ? ? ? 1?RS3 RS0 ?PF 1 PIE ?PF PIE 1 ?IRQ ? IRQF 1? C RESET ?

5 ǖ ? (AF)?AF 1? ? AIE 1? IRQ ? ? IRQF 1? C RESET ?

4 ǖ ? (UF)? ?UF 1? UIE 1? UF 1 IRQF 1?? IRQ ? C RESET ?

3 0 ǖ ? C ? ? 0? ? ?

C

V BACKUP ? ? ? 1? 0? ? ?RTC RAM ? ? ? RESET ?

? 0? ? ?

RTC

DS12R885/DS12CR887/DS12R887

RTC

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19

__________________ RAM (NV RAM)

DS12R885 114 NV RAM ? ? ? ? ?

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?DS12R885 ? ? ? ? 500ms 122μs ? ? ? ? ? ? B ? 1? ? 0? IRQ ? ? ? ? ?IRQ ? ? ? ? ?

? C ? 1? ? B ? ? ? ? ? ? ? ? ? 1? ? ? ǘ ? ? ? C ?? ? ? C ? ?? 1 ? ? 1( ) ? 0? ? ? C ? 1?2 3 ? C ? ?? ?? ?

? ? ? 1 ?IRQ ? ? ? ?IRQ ? ?IRQ ? C IRQF 1? RTC C ? 7 (IRQF ) 1 ? DS12R885 ? C ? ? IRQF ?

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DS12R887 DS12CR887 ? ? ? ? ? ? A 4 6 010 ? ?11x (DV2=1,DV1=1,DV0=X) ? ? ? 4 6 ??

__________________________ ?

15 13 16 1 ? ? ? ? A RS0–RS3 ( ?1)? ?SQW ? SQWE ??

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500ms 122μs IRQ ? ? ? ? ? A ? (?1)? ? A RS0–RS3 ? ? B ?SQWE ? B PIE ? ? ? ? ?

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