DS3232 Maxim, DS3232 Datasheet
DS3232
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DS3232 Summary of contents
Page 1
... The integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece-part count in a manufacturing line. The DS3232 is available in commercial and industrial temperature ranges, and is offered in an industry-standard 20-pin, 300-mil SO package ...
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... For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...
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ELECTRICAL CHARACTERISTICS (continued 2.3V to 5.5V active supply (see Table 1 3.3V 3.0V, and T = +25°C, unless otherwise noted.) (Notes 2, 3) BAT A PARAMETER SYMBOL Logic 0 Output, INT/SQW, ...
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Extremely Accurate I Integrated Crystal and SRAM AC ELECTRICAL CHARACTERISTICS (Active supply (see Table 1) = 2.3V to 5.5V, T PARAMETER SYMBOL SCL Clock Frequency Bus Free Time Between STOP and START Conditions Hold Time (Repeated) START t Condition (Note ...
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Extremely Accurate I RST PF(MAX PF(MIN) t VCCF RST _____________________________________________________________________ Integrated Crystal and SRAM Pushbutton Reset Timing t RST 2 C RTC with Power-Switch Timing VCCR t REC 5 ...
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... Note 8: A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V to bridge the undefined region of the falling edge of SCL. Note 9: The maximum t needs only to be met if the device does not stretch the low period (t ...
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... TEMPERATURE (°C) Extremely Accurate I Integrated Crystal and SRAM Typical Operating Characteristics CC 4.8 5.3 = 3.4V BAT V = 3.0V BAT DELTA TIME AND FREQUENCY vs. TEMPERATURE DS3232 toc05 20 0 CRYSTAL -20 +20ppm -40 TYPICAL CRYSTAL, -60 UNCOMPENSATED -80 -100 DS3232 CRYSTAL ACCURACY -120 -20ppm BAND -140 -160 -180 -200 ...
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... ADDRESS REGISTER DECODE SDA Detailed Description The DS3232 is a serial RTC driven by a temperature- compensated 32kHz crystal oscillator. The TCXO pro- vides a stable and accurate reference clock, and maintains the RTC to within ±2 minutes per year accu- racy from -40°C to +85°C. The TCXO frequency output is available at the 32kHz pin ...
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... Also available are 236 bytes of gen- eral-purpose battery-backed SRAM. The block diagram shows the main elements of the DS3232. The eight blocks can be grouped into four functional groups: TCXO, power control, pushbutton function, and RTC. Their operations are described sep- arately in the following sections ...
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... Pushbutton Reset Function The DS3232 provides for a pushbutton switch to be con- nected to the RST output pin. When the DS3232 is not in a reset cycle, it continuously monitors the RST signal for a low going edge edge transition is detected, the DS3232 debounces the switch by pulling the RST low ...
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... Figure 1. Address Map for DS3232 Timekeeping Registers and SRAM BIT 7 ADDRESS BIT 6 BIT 5 MSB 00h 0 10 Seconds 01h 0 10 Minutes AM/PM 02h 0 12/24 20 Hour 03h 04h 0 0 05h Century 0 0 06h 10 Year 07h A1M1 10 Seconds 08h A1M2 10 Minutes AM/PM 09h A1M3 12/24 20 Hour ...
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... The countdown chain is reset whenever the seconds register is written. Write transfers occur on the acknowl- edge from the DS3232. Once the countdown chain is reset, to avoid rollover issues the remaining time and date registers must be written within 1 second. The 1Hz ...
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... Control Register (0Eh) Bit 7: Enable Oscillator (EOSC). When set to logic 0, the oscillator is started. When set to logic 1, the oscilla- tor is stopped when the DS3232 switches to battery power. This bit is clear (logic 0) when power is first applied. When the DS3232 is powered by V oscillator is always on regardless of the status of the EOSC bit ...
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... When set to logic 0, the 32kHz pin goes low. The initial power-up state of this bit is logic 1, and a 32.768kHz square-wave signal appears at the 32kHz pin after a power source is applied to the DS3232 (if the oscillator is running). Bit 2: Busy (BSY). This bit indicates the device is busy executing TCXO functions ...
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BIT 7 BIT 6 NAME: SIGN DATA POR BIT 7 BIT 6 NAME: SIGN DATA POR BIT 7 BIT 6 NAME: DATA DATA POR BIT 7 BIT 6 NAME POR ...
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... The bus must be con- trolled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions. The DS3232 operates as a slave 2 on the I C bus. Connections to the bus are made through the SCL input and open-drain SDA I/O lines ...
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ADDRESS> <R/W> <WORD ADDRESS (n)> S 1101000 0 A XXXXXXXX S - START SLAVE TO MASTER A - ACKNOWLEDGE (ACK STOP R/W - READ/WRITE OR DIRECTION BIT ADDRESS Figure 3. Data Write—Slave Receiver Mode <SLAVE ADDRESS> <R/W> ...
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... DS3232. This sets the register pointer on the DS3232, with the DS3232 acknowledging the transfer. The master may then transmit zero or more bytes of data, with the DS3232 acknowledging each byte received. The register pointer increments after each data byte is trans- ferred ...
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... Control Register (0Eh) section; added the land pattern no. to the Package Information table Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. ...