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参数资料
| 型号： | DS1308U-33+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC RTC 56BYTE NVRAM I2C 8UMAX |
| 标准包装： | 3,000 |
| 类型： | 时钟/日历 |
| 特点： | 闰年，NVSRAM，方波输出 |
| 存储容量： | 56B |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | I²C，2 线串口 |
| 电源电压： | 3 V ~ 5.5 V |
| 电压 - 电源，电池： | 1.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 带卷 (TR) |
DS1308
Low-Current I2C RTC with 56-Byte NV RAM
10
Maxim Integrated
RTC and RAM Address Map
Table 3 shows the address map for the RTC and RAM
registers. The RTC registers and control register are
located in address locations 00h–07h. The RAM regis-
ters are located in address locations 08h–3Fh. During a
multibyte access, when the register pointer reaches 3Fh
(the end of RAM space) it wraps around to location 00h
(the beginning of the clock space). On an I2C START, or
register pointer incrementing to location 00h, the current
time and date is transferred to a second set of registers.
The time and date in the secondary registers are read in
a multibyte data transfer, while the clock continues to run.
This eliminates the need to re-read the registers in case
of an update of the main registers during a read.
Clock and Calendar
The time and calendar information is obtained by reading
the appropriate register bytes. The time and calendar are
set or initialized by writing the appropriate register bytes.
The contents of the time and calendar registers are in the
BCD format. Bit 7 of Register 0 is the clock halt (CH) bit.
When this bit is set to 1, the oscillator is disabled. When
cleared to 0, the oscillator is enabled. The clock can
be halted whenever the timekeeping functions are not
required, which minimizes VBAT current (IBATDAT) when
VCC is not applied.
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 operation.
When reading or writing the time and date registers,
secondary (user) buffers are used to prevent errors when
the internal registers update. When reading the time and
date registers, the user buffers are synchronized to the
internal registers on any START and when the register
pointer rolls over to zero. The countdown chain is reset
whenever the seconds register is written. Write transfers
occur on the acknowledge from the DS1308. Once the
countdown chain is reset, to avoid rollover issues the
remaining time and date registers must be written within
1 second. The 1Hz square-wave output, if enabled,
transitions high 500ms after the seconds data transfer,
provided the oscillator is already running.
The DS1308 runs in either 12-hour or 24-hour mode.
Bit 6 of the hours register is defined as the 12-hour 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). If the 12/24-hour mode select
is changed, the hours register must be re-initialized to
the new format.
Table 3. RTC and RAM Address Map
Note: Bits listed as “0” always read as a 0.
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
FUNCTION
RANGE
00h
CH
10 Seconds
Seconds
00–59
01h
0
10 Minutes
Minutes
00–59
02h
0
12/24
AM/PM
10 Hour
Hour
Hours
1–12 + AM/
PM
00–23
20 Hour
03h
0
Day
1–7
04h
0
10 Date
Date
01–31
05h
0
10
Month
01–12
06h
10 Year
Year
00–99
07h
OUT
ECLK
OSF
SQWE
LOS
BBCLK
RS1
RS0
Control
08h–3Fh
RAM 56 x 8
00h–FFh
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相关代理商/技术参数 |
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| DS1310 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| DS13-1000 | 功能描述:固态继电器-PCB安装 HIGH FREQUENCY RELAY RoHS:否 制造商:Omron Electronics 控制电压范围: 负载电压额定值:40 V 负载电流额定值:120 mA 触点形式:1 Form A (SPST-NO) 输出设备:MOSFET 封装 / 箱体:USOP-4 安装风格:SMD/SMT |
| DS13-1000S | 制造商:TE Connectivity 功能描述:High Performance Solid State Relays |
| DS13-1001 | 制造商:MA-COM 制造商全称:M/A-COM Technology Solutions, Inc. 功能描述:DS13 Series High Performance Solid State Relays For Loads Up To 2A@60Vdc |
| DS13-1002 | 功能描述:固态继电器-PCB安装 DS13 SOLID STATE D RoHS:否 制造商:Omron Electronics 控制电压范围: 负载电压额定值:40 V 负载电流额定值:120 mA 触点形式:1 Form A (SPST-NO) 输出设备:MOSFET 封装 / 箱体:USOP-4 安装风格:SMD/SMT |
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