DS1388Z-3+T&R【PDF 3/19 页】IC RTC I2C W/CHARGER 8-SOIC

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Sheet目录1993

1页 2页 [3页]4页 5页 6页 7页

I2C RTC/Supervisor with Trickle Charger

and 512 Bytes EEPROM

Maxim Integrated

DS1388

ADDRESS

BLK

WORD

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

FUNCTION

RANGE

00h

Tenth Seconds

Hundredths of Seconds

Hundredths of

Seconds

00–99

01h

10 Seconds

Seconds

00–59

02h

10 Minutes

Minutes

00–59

AM/

10 Hour

03h

12/24

10 Hour

Hours

1–12+

AM/PM

00–23

04h

Day

01–07

05h

10 Date

Date

01–31

06h

Month

01–12

07h

10 Year

Year

00–99

08h

Watchdog Tenths of Seconds

Watchdog Hundredths of Seconds

Watchdog

Hundredth

Seconds

00–99

09h

Watchdog Ten Seconds

Watchdog Seconds

Watchdog

Seconds

00–99

0Ah

TCS3

TCS2

TCS1

TCS0

DS1

DS0

ROUT1

ROUT0

Trickle Charger

—

0Bh

OSF

Flag

—

0Ch

EOSC

WDE

WD/RST

Control

—

00–FFh

256 x 8 EEPROM

EEPROM

00–FFh

256 x 8 EEPROM

EEPROM

00–FFh

Figure 4. Address Map

Note: Unless otherwise specified, the state of the registers is not defined when power (VCC and VBACKUP) is first applied.

X = General-purpose read/write bit.

0 = Always reads as a zero.

Clock and Calendar

The time and calendar information is obtained by read-

ing the appropriate register bytes. Figure 4 illustrates

the RTC registers. The time and calendar are set or ini-

tialized by writing the appropriate register bytes. The

contents of the time and calendar registers are in the

binary-coded decimal (BCD) format. The end of the

month date is automatically adjusted for months with

fewer than 31 days, including corrections for leap years

through 2099. The day-of-week register increments at

midnight. Values that correspond to the day-of-week

are user-defined but must be sequential (i.e., if 1

equals Sunday, then 2 equals Monday, and so on).

Illogical time and date entries result in undefined oper-

ation. The DS1388 can be run in either 12-hour or 24-

hour mode. Bit 6 of the hours register is defined as the

12- or 24-hour mode-select bit. When high, the 12-hour

mode is selected. In the 12-hour mode, bit 5 is the

AM/PM bit with logic-high being PM. In the 24-hour

mode, bit 5 is the 20-hour bit (20–23 hours). Changing

the 12/24 bit requires that the hours data be re-entered

in the proper format.

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