DS1308 Dallas Semiconductor, DS1308 Datasheet
DS1308
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DS1308 Summary of contents
Page 1
... Optional industrial temperature range -40°C to +85°C (IND) available for DS1307 and DS1308 DS1307 available in 8-pin DIP or SOIC DS1308 available in 36-pin SMD BGA (Ball Grid Array) DS1308 accuracy is better than ±2 minute/month at 25°C Recognized by Underwriters Laboratory ...
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... The DS1308 incorporates the DS1307 chip with a 32.768 kHz crystal in a surface mountable, 36-pin ball grid array package (BGA). The close proximity of the embedded crystal to the high impedance crystal input pins on the DS1307 minimizes capacitive loading and noise injection problems associated with many other oscillator designs ...
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... Microcontroller” for additional information. RTC AND RAM ADDRESS MAP The address map for the RTC and RAM registers of the DS1307/DS1308 is shown in Figure 2. The real time clock registers are located in address locations 00h to 07h. The RAM registers are located in address locations 08h to 3Fh. During a multi-byte access, when the address pointer reaches 3Fh, the end of RAM space, it wraps around to location 00h, the beginning of the clock space ...
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... Please note that the initial power on state of all registers is not defined. Therefore it is important to enable the oscillator (CH bit=0) during initial configuration. The DS1307/DS1308 can be run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the 12- 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 ...
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... The bus must be controlled by a master device which generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions. The DS1307/DS1308 operates as a slave on the 2-wire bus. A typical bus configuration using this 2-wire protocol is show in Figure 4. ...
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... Within the 2-wire bus specifications a regular mode (100 kHz clock rate) and a fast mode (400 kHz clock rate) are defined. The DS1307/DS1308 operates in the regular mode (100 kHz) only. Acknowledge: Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte ...
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... After receiving and decoding the address byte the device outputs an W acknowledge on the SDA line. After the DS1307/DS1308 acknowledges the slave address + write bit, the master transmits a register address to the DS1307/DS1308 This will set the register pointer on the DS1307/DS1308. The master will then begin transmitting each byte of data with the DS1307/DS1308 acknowledging each byte received ...
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DATA READ - SLAVE TRANSMITTER MODE Figure DS1307/1308 ...
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... Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. The Dallas Semiconductor DS1307/DS1308 is built to the highest quality standards and manufactured for long term reliability. All Dallas Semiconductor devices are made using the same quality materials and manufacturing methods ...
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... SCL clocking at max frequency = 100 kHz. CCA 10. SCL only. 11. SDA and SQW/OUT 12. The DS1308 is designed to be subjected to no more than two passes through a solder reflow process to limit premature crystal aging effects and maintain a reasonable accuracy of ±2 minutes/month at 25 degrees C (worst case - + ...
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TIMING DIAGRAM Figure 8 DS1307 SERIAL REAL TIME CLOCK 8-PIN DIP MECHANICAL DIMENSIONS PKG 8-PIN DIM MIN A IN. 0.360 MM 9.14 B IN. 0.240 MM 6.10 C IN. 0.120 MM 3.05 D IN. 0.300 MM 7.62 ...
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DS1307Z SERIAL REAL TIME CLOCK 8-PIN SOIC (150-MIL) MECHANICAL DIMENSIONS 8-PIN PKG (150 MIL) DIM MIN A IN. 0.188 MM 4.78 B IN. 0.150 MM 3.81 C IN. 0.048 MM 1.22 E IN. 0.004 MM 0.10 F ...
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... DS1308 MECHANICAL DIMENSIONS PKG 36-PIN BALL GRID DIM MIN MAX A IN. 0.395 0.405 MM B IN. 0.445 0.455 MM C IN. 0.022 0.028 MM D IN. 0.047 0.053 MM E IN. 0.047 0.053 MM F IN. 0.347 0.353 MM G IN. 0.170 0.190 MM H IN. 0.025 0.030 DS1307/1308 ...
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... DS1308 RECOMMENDED LAYOUT LAND PATTERN DS1307/1308 ...