DS1302实时时钟芯片数据手册

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"DS1302数据手册" DS1302是一款实时钟芯片，用于精确计时，包括秒、分钟、小时、日期、月份、星期以及年份，并且具有闰年补偿功能，时间准确度一直有效至2100年。这款芯片设计紧凑，仅需3个引脚进行串行I/O操作，从而减少了外部引脚的数量。它在2.0到5.5伏的工作电压范围内都能正常运行，而且在2.0伏电压下功耗极低，小于300纳安，使得它在能源效率方面表现出色。 DS1302内部集成了31x8位的RAM，可用于存储临时数据，支持单字节或多字节（突发模式）的数据读写操作，无论是时钟数据还是RAM数据都能高效处理。芯片采用8引脚DIP或8引脚SOIC封装，适合表面贴装。此外，它还提供了3线简单接口，与TTL兼容（当VCC为5V时），并有工业级温度范围选项，能在-40°C到+85°C的环境下稳定工作。与DS1202兼容，这意味着DS1302可以替代DS1202在现有系统中的应用。该芯片已通过了Underwriters Laboratories的安全认证，确保了其在各种应用中的可靠性。在订购信息部分，DS1302有多个型号，如8引脚DIP封装的DS1302，8引脚DIP（工业级）的DS1302N，以及不同封装尺寸和工业级温度范围的SOIC版本。还有16引脚SOIC封装的型号，如DS1302S-16和DS1302SN-16，提供更多的引脚选项以适应不同的电路布局需求。在引脚分配上，X1和X2是32.768kHz晶体的连接引脚，负责提供精确的时间基准；GND是接地引脚；RST是复位引脚，用于初始化芯片；I/O是数据输入/输出引脚，通过此引脚实现串行通信；SCLK是串行时钟引脚，控制数据传输的时序；而VCC1和VCC2是电源引脚，为芯片提供工作电压。 DS1302是一款高性能、低功耗、易于集成的实时钟解决方案，广泛应用于需要精确时间记录的各种电子设备中，如嵌入式系统、智能家居设备、仪器仪表等。它的高灵活性和可靠性使其成为许多设计者的首选时钟芯片。

DS1302

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X1, X2 – Connections for a standard 32.768 kHz quartz crystal. The internal oscillator is designed for

operation with a crystal having a specified load capacitance of 6 pF. For more information on crystal

selection and crystal layout considerations, please consult Application Note 58, “Crystal Considerations

with Dallas Real Time Clocks.” The DS1302 can also be driven by an external 32.768 kHz oscillator. In

this configuration, the X1 pin is connected to the external oscillator signal and the X2 pin is floated.

COMMAND BYTE

The command byte is shown in Figure 2. Each data transfer is initiated by a command byte. The MSB

(Bit 7) must be a logic 1. If it is 0, writes to the DS1302 will be disabled. Bit 6 specifies clock/calendar

data if logic 0 or RAM data if logic 1. Bits 1 through 5 specify the designated registers to be input or

output, and the LSB (bit 0) specifies a write operation (input) if logic 0 or read operation (output) if logic

1. The command byte is always input starting with the LSB (bit 0).

ADDRESS/COMMAND BYTE Figure 2

RESET AND CLOCK CONTROL

All data transfers are initiated by driving the RST input high. The RST input serves two functions. First,

RST turns on the control logic which allows access to the shift register for the address/command

sequence. Second, the RST signal provides a method of terminating either single byte or multiple byte

data transfer.

A clock cycle is a sequence of a falling edge followed by a rising edge. For data inputs, data must be

valid during the rising edge of the clock and data bits are output on the falling edge of clock. If the RST

input is low all data transfer terminates and the I/O pin goes to a high impedance state. Data transfer is

illustrated in Figure 3. At power–up, RST must be a logic 0 until V

> 2.0 volts. Also SCLK must be at

a logic 0 when RST is driven to a logic 1 state.

DATA INPUT

Following the eight SCLK cycles that input a write command byte, a data byte is input on the rising edge

of the next eight SCLK cycles. Additional SCLK cycles are ignored should they inadvertently occur.

Data is input starting with bit 0.

DATA OUTPUT

Following the eight SCLK cycles that input a read command byte, a data byte is output on the falling

edge of the next eight SCLK cycles. Note that the first data bit to be transmitted occurs on the first falling

edge after the last bit of the command byte is written. Additional SCLK cycles retransmit the data bytes

should they inadvertently occur so long as RST remains high. This operation permits continuous burst

mode read capability. Also, the I/O pin is tri–stated upon each rising edge of SCLK. Data is output

starting with bit 0.

BURST MODE

Burst mode may be specified for either the clock/calendar or the RAM registers by addressing location 31

decimal (address/command bits 1 through 5 = logic 1). As before, bit 6 specifies clock or RAM and bit 0

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