Datasheet > 微控制器和处理器 > 计时器或实时时钟> DS2404B

DS2404B

更新时间： 2024-01-27 09:53:54

品牌	Logo	应用领域
达拉斯 - DALLAS		计时器或实时时钟微控制器和处理器外围集成电路光电二极管
页数	文件大小	规格书
28页	664K
描述
EconoRAM Time Chip

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数据手册

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DS2404B 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	0.300 INCH, SOIC-16	针数：	16
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.8
其他特性：	1 HZ FIXED O/P; 64-BIT LASERED ROM; TIMEKEEPING CURRENT = 350NA	最大时钟频率：	0.032 MHz
信息访问方法：	SERIAL, 3-WIRE	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e0	长度：	10.3 mm
湿度敏感等级：	1	端子数量：	16
计时器数量：		最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	240
认证状态：	Not Qualified	座面最大高度：	2.65 mm
最大供电电压：	5.5 V	最小供电电压：	4.5 V
标称供电电压：	5 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	7.5 mm
uPs/uCs/外围集成电路类型：	TIMER, REAL TIME CLOCK	Base Number Matches：	1

DS2404B 数据手册

DS2404

MEMORY

The memory map in Figure 4 shows a page (32 bytes) called the scratchpad and 17 pages called memory.

Pages 0 through 15 each contain 32 bytes which make up the 4096-bit SRAM. Page 16 has only 30 bytes

which contain the timekeeping registers.

The scratchpad is an additional page of memory that acts as a buffer when writing to memory. Data is

first written to the scratchpad where it can be read back. After the data has been verified, a copy

scratchpad command will transfer the data to memory. This process ensures data integrity when

modifying the memory.

TIMEKEEPING

A 32.768 kHz crystal oscillator is used as the time base for the timekeeping functions. The oscillator can

be turned on or off by an enable bit in the control register. The oscillator must be on for the real time

clock, interval timer, cycle counter and 1 Hz output to function.

The timekeeping functions are double buffered. This feature allows the master to read time or count

without the data changing while it is being read. To accomplish this, a snapshot of the counter data is

transferred to holding registers which the user accesses. This occurs after the eighth bit of the Read

Memory Function command.

Real-Time Clock

The real-time clock is a 5-byte binary counter. It is incremented 256 times per second. The least

significant byte is a count of fractional seconds. The upper four bytes are a count of seconds. The real-

time clock can accumulate 136 years of seconds before rolling over. Time/date is represented by the

number of seconds since a reference point which is determined by the user. For example, 12:00A.M.,

January 1, 1970 could be a reference point.

Interval Timer

The interval timer is a 5-byte binary counter. When enabled, it is incremented 256 times per second. The

least significant byte is a count of fractional seconds. The interval timer can accumulate 136 years of

seconds before rolling over. The interval timer has two modes of operation which are selected by the

AUTO/MAN bit in the control register. In the auto mode, the interval timer will begin counting after the

I/O line has been high for a period of time determined by the DSEL bit in the control register. Similarly,

the interval timer will stop counting after the I/O line has been low for a period of time determined by the

DSEL bit. In the manual mode, time accumulation is controlled by the STOP/START bit in the control

NOTE: For auto mode operation, the high level on the I/O pin must be greater than or equal to 70% of

V_CCor V_BATO

Cycle Counter

The cycle counter is a 4-byte binary counter. It increments after the falling edge of the I/O line if the

appropriate I/O line timing has been met. This timing is selected by the DSEL bit in the control register.

(See “Status/ Control” section).

NOTE: For cycle counter operation, the high level on the I/O pin must be greater than or equal to 70% of

V_CCor V_BATO

6 of 28

020998

1...3 4 567 8 9...28

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与DS2404B相关器件

型号	品牌	描述	获取价格	数据表
DS2404B/T&R	DALLAS	Analog Waveform Generation Function, CMOS, PDSO16,	获取价格
DS2404B+T&R	MAXIM	Real Time Clock, 0 Timer(s), CMOS, PDSO16, 0.208 INCH, ROHS COMPLIANT, SSOP-16	获取价格
DS2404S	DALLAS	EconoRAM Time Chip	获取价格
DS2404S-001	DALLAS	Real Time Clock, 0 Timer(s), CMOS, PDSO16,	获取价格
DS2404S-001+	MAXIM	Real Time Clock, 0 Timer(s), CMOS, PDSO16, 0.300 INCH, ROHS COMPLIANT, SOIC-16	获取价格
DS2404S-001+T&R	MAXIM	Real Time Clock, 0 Timer(s), CMOS, PDSO16, 0.300 INCH, ROHS COMPLIANT, SOIC-16	获取价格

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