M48T86MH1E datasheet, PDF - EEWORLD Datasheet

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M48T86MH1E: DescriptionReal Time Clock 5 Volt PC Drop-In; CategoryThe embedded processor and controller Microcontrollers and processors; File Size287KB，36 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/; Environmental Compliance

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M48T86MH1E Overview

Real Time Clock 5 Volt PC Drop-In

M48T86MH1E Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	STMicroelectronics
Parts packaging code	SOIC
package instruction	SOP, SOP28,.5
Contacts	28
Reach Compliance Code	compliant
ECCN code	EAR99

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M48T86

5.0 V PC real-time clock

Not For New Design

Features

■

Drop-in replacement for PC computer

clock/calendar

Counts seconds, minutes, hours, days, day of

the week, date, month, and year with leap year

compensation

Clock accuracy better than

1 minute per

month

Interfaced with software as 128 RAM locations:

– 14 bytes of clock and control registers

– 114 bytes of general purpose RAM

Selectable bus timing (Intel/Motorola)

Three interrupts are separately software-

maskable and testable

– Time-of-day alarm (once/second to

once/day)

– Periodic rates from 122 µs to 500 ms

– End-of-clock update cycle

Programmable square wave output

■

)

-O

■

PCDIP24 (PC)

Battery/Crystal

CAPHAT

SNAPHAT (SH)

Battery/Crystal

10 years of data retention and clock operation

in the absence of power

Self-contained battery and crystal in the

CAPHAT™ DIP package

Packaging includes a 28-lead SOIC and

SNAPHAT

top (to be ordered separately)

SOIC package provides direct connection for a

SNAPHAT top contains the battery and crystal

Pin and function compatible with bq3285/7A

and DS12887

RoHS compliant

– Lead-free second level interconnect

SOH28 (MH)

December 2008

Rev 7

1/36

www.st.com

This is information on a product still in production but not recommended for new designs.

Contents

M48T86

Contents

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1

Signal description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1.1

2.1.2

2.1.3

2.1.4

2.1.5

2.1.6

2.1.7

2.1.8

2.1.9

2.1.10

2.1.11

2.1.12

, V

SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

SQW (square wave output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

AD0-AD7 (multiplexed bidirectional address/data bus) . . . . . . . . . . . . . . 9

AS (address strobe input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

MOT (mode select) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

DS (data strobe input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

E (chip enable input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

IRQ (interrupt request output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

RST (reset input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

RCL (RAM clear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

R/W (read/write input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Non-volatile RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

)

-O

3.1

3.2

3.3

3.4

3.5

3.6

3.7

3.8

3.9

3.10

3.10.1

3.10.2

3.10.3

Clock operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Address map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Time, calendar, and alarm locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Periodic interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Alarm interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Update cycle interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Oscillator control bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Update cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Square wave output selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

UIP update in progress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

OSC0, OSC1, OSC2 oscillator control . . . . . . . . . . . . . . . . . . . . . . . . . 19

RS3, RS2, RS1, RS0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.11

3.11.1

SET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2/36

M48T86

3.11.2

3.11.3

3.11.4

3.11.5

3.11.6

3.11.7

3.11.8

Contents

PIE: periodic interrupt enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

AIE: alarm interrupt enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

UIE: update ended interrupt enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

SQWE: square wave enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DM: data mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

24/12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

DSE: daylight savings enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.12

3.12.1

3.12.2

3.12.3

3.12.4

3.12.5

IRQF: interrupt request flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

PF: periodic interrupt flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

AF: alarm flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

UF: update ended interrupt flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

BIT 0 through 3: unused bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.13

3.13.1

3.13.2

VRT: valid RAM and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

BIT 0 through 6: unused bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.14

noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . 23

)

-O

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

3/36

M48T86MH1E Related Products

	M48T86MH1E	M48T86MH1	M48T86MH1F
Description	Real Time Clock 5 Volt PC Drop-In	Real Time Clock	Real Time Clock 5 Volt PC Drop-In
Is it Rohs certified?	conform to	conform to	conform to
Maker	STMicroelectronics	STMicroelectronics	STMicroelectronics
Parts packaging code	SOIC	SOIC	SOIC
package instruction	SOP, SOP28,.5	SOP, SOP28,.5	SOP, SOP28,.5
Contacts	28	28	28
Reach Compliance Code	compliant	compliant	compliant
ECCN code	EAR99	EAR99	EAR99

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