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參數(shù)資料
| 型號： | DS1558Y-TRL |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 16/18頁 |
| 文件大小： | 0K |
| 描述： | IC RTC W/NV RAM 5V 48-TQFP |
| 標準包裝： | 2,000 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，閏年，監(jiān)視計時器，Y2K |
| 時間格式： | HH:MM:SS（24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | 并聯(lián) |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 電壓 - 電源，電池： | 2.5 V ~ 3.7 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 帶卷 (TR) |
DS1558
7 of 18
CLOCK OPERATIONS
Table 2 and the following paragraphs describe the operation of the RTC, alarm, and watchdog functions.
Table 2. DS1558 REGISTER MAP
DATA
ADDR
GE
ESS
B7
B6
B5
B4
B3
B2
B1
B0
FUNCTION/RAN
7FFFF
00–99
h
10 YEAR
YEAR
7FFF
01–12
Eh
X
10 M
MONTH
7FFFD
01–31
h
X
10 DATE
DATE
7FFF
01–07
Ch
X
FT
X
DAY
7FFF
00–23
Bh
X
10 HOUR
HOUR
7FFFAh
X
10 MINUTES
MINUTES
00–59
7FFF9h
OSC
10 SECONDS
SECONDS
00–59
7FFF
00–39
8h
W
R
10 CENTURY
CENTURY
CONTROL
7FFF7h
—
WDS
BMB4
BMB3
BMB2
BMB1
BMB0
RB1
RB0
WATCHDOG
7FFF6h
AE
Y
ABE
Y
INTERRUPTS
—
7FFF5h
AM4
Y
10 DATE
DATE
ALARM DATE
01–31
7FF
A
1
HOURS
ALARM HOURS
00–23
F4h
M3
Y
0 HOURS
7FFF3h
A
1
INUT
MINUTES
ALARM MINUTES
00–59
M2
0 M
ES
7FFF2h
A
1
CO
SECONDS
ALARM SECONDS
00–59
M1
0 SE
NDS
7FFF1h
Y
UNUSED
—
Y
7FFF0h
W
0
F
0
FLAGS
—
F
AF
BL
0
X = Unused, Read/Writeable Under Write and
Y = Unused, Read/Writeable Without Write and Read Bit Control
BLF = Batter
w Flag
CLOCK OSCILLATOR CONTROL
The oscillator can be turned off to minimi
the battery. The
Read Bit Control
AE = Alarm Flag Enable
FT = Frequency Test Bit
OSC = Oscillator Start/Stop Bit
ABE = Alarm in Backup-Battery Mode Enable
W = Write Bit
AM1–AM4 = Alarm Mask Bits
R = Read Bit
WF = Watchdog Flag
WEN = Watchdog Enable Bit
AF = Alarm Flag
BMB0–BMB4 = Watchdog Multiplier Bits
0 = Reads as a 0 and Cannot Be Changed
RB0–RB1 = Watchdog Resolution Bits
y Lo
ze current drain from
OSC
the seconds register (B7 of 7FFF9h). Setting
bit is the MSB of
OSC
to a 1 stops the oscillator; setting to a 0 starts the
oscillator. The initial state of OSC is not guaranteed. When power is applied for the first time, the OSC
bit should be enabled.
quency can be verified by se
bit and
monitoring the
Oscillator operation and fre
tting the FT
IRQ
/FT pin for 512Hz.
OSCILLATOR STARTUP TIME
Oscillator startup times are highly dependent upon crystal characteristics and layout. High ESR and
excessive capacitive loads are the major contributors to long startup times. A circuit using a crystal with
the recommended characteristics and following the recommended layout usually starts within 1 second.
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