DS1388 데이터 시트보기 (PDF) - Maxim Integrated
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DS1388 Datasheet PDF : 19 Pages
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I2C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
ADDRESS
BLK WORD
0H
00H
0H
01H
0H
02H
0H
03H
0H
04H
0H
05H
0H
06H
0H
07H
BIT 7
0
0
0
0
0
0
BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
Tenth Seconds
10 Seconds
10 Minutes
AM/ 10 Hour
12/24 PM
10 Hour
0
0
0
0
10 Date
0
X 10 Month
10 Year
Hundredths of Seconds
Seconds
Minutes
Hours
X
Day
Date
Month
Year
FUNCTION
Hundredths of
Seconds
Seconds
Minutes
Hours
Day
Date
Month
Year
0H
08H
Watchdog Tenths of Seconds
Watchdog Hundredths of Seconds
Watchdog
Hundredth
Seconds
0H
09H
Watchdog Tenths of Seconds
Watchdog Seconds
Watchdog
Seconds
0H
0AH TCS3 TCS2 TCS1 TCS0 DS1
DS0 ROUT1 ROUT0 Trickle Charger
0H
0BH
OSF WF
0
0
0
0
0
0
Flag
0H
0CH EOSC
0
0
0
0
0
WDE WD/RST
Control
1H 00–FFH
256 x 8 EEPROM
EEPROM
2H 00–FFH
256 x 8 EEPROM
EEPROM
Figure 4. Address Map
RANGE
00–99
00–59
00–59
1–12+
AM/PM
00–23
01–07
00–31
01–12
00–99
00–99
00–99
—
—
—
00–FFh
00–FFh
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 second 10-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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