参数资料
| 型号： | DS1558W+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/18页 |
| 文件大小： | 0K |
| 描述： | IC RTC W/NV RAM 3.3V 48-LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 250 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，监视计时器，Y2K |
| 时间格式： | HH:MM:SS（24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 并联 |
| 电源电压： | 2.97 V ~ 3.63 V |
| 电压 - 电源，电池： | 2.5 V ~ 3.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
| 产品目录页面： | 1434 (CN2011-ZH PDF) |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1558W+ | 功能描述:实时时钟 Watchdog Clock w/NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1558W+TRL | 功能描述:实时时钟 Watchdog Clock w/NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1558W-TRL | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1558Y | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1558Y+ | 功能描述:实时时钟 Watchdog Clock w/NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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