DS3231M Maxim, DS3231M Datasheet
DS3231M
Available stocks
Related parts for DS3231M
DS3231M Summary of contents
Page 1
... The DS3231M is available in the same footprint as the popular DS3231 RTC. The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year ...
Page 2
... Storage Temperature Range ............................ -55NC to +125NC 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 ...
Page 3
DC_ELECTRICAL_CHARACTERISTICS—GENERAL_(continued +2.3V to +5.5V -40NC to +85NC, unless otherwise noted. Typical values are +25NC, unless otherwise noted.) PARAMETER SYMBOL Power-Fail Voltage Logic 0 Output (32KHZ, INT/SQW, SDA) Logic 0 Output (RST) Output ...
Page 4
I C Real-Time Clock AC_ELECTRICAL_CHARACTERISTICS— +2.3V to +5.5V -40NC to +85NC, unless otherwise noted. Typical values are BAT A and T = +25NC, unless otherwise noted.) (Note 5, Figure ...
Page 5
SDA t BUF t LOW SCL t t HD:STA R STOP START NOTE: TIMING IS REFERENCED TO V AND V . ILMAX IHMIN 2 Figure Timing t VCCF V PFMAX V PFMIN V CC RST Figure 2. ...
Page 6
I C Real-Time Clock (T = +25°C, unless otherwise noted.) A POWER-SUPPLY CURRENT vs. POWER-SUPPLY VOLTAGE 150 V = 2.3V, EN32KHZ = 1, I BAT 140 130 +85°C 120 110 100 90 80 INCREASE BELOW V 70 DUE ...
Page 7
... RST pin is pulled high by the internal pullup resistor. The active-low, open-drain input as the backup power source, the capacitor is not required BAT www.maxim-ic.com/qa/info/ul Pin Configuration + 1 8 SCL 2 7 SDA DS3231M BAT 4 5 GND SO Pin Description relative CC exceeds ...
Page 8
... I C INTERFACE SCL Detailed Description The DS3231M is a serial real-time clock (RTC) driven by an internal, temperature-compensated, microelectrome- chanical systems (MEMS) resonator. The oscillator pro- vides a stable and accurate reference clock and main- tains the RTC to within Q0.432 seconds-per-day accu- racy from -40NC to +85NC. The RTC is a low-power clock/ calendar with two programmable time-of-day alarms ...
Page 9
... The device also contains an Aging Offset reg- ister that allows a constant offset (positive or negative added to the factory-trimmed adjustment value. The DS3231M can be configured to operate on a single power supply (using either V supply configuration, which provides a backup supply source to keep the timekeeping circuits alive during absence of primary system power ...
Page 10
I C Real-Time Clock less than V and is less than device is powered by V (see Table 1). BAT When V < the RST output ...
Page 11
Table_2._Timekeeping_Registers BIT_7_ ADDRESS BIT_6 MSB 00h 0 10 Seconds 01h 0 10 Minutes 02h 0 12/24 03h 0 0 04h 0 0 05h Century 0 06h 10 Year 07h A1M1 10 Seconds 08h A1M2 10 Minutes 09h A1M3 12/24 0Ah ...
Page 12
I C Real-Time Clock to 00. 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 equals Sunday, then 2 equals Monday, and so ...
Page 13
BIT_7 BIT_6 BIT_5 BBSQW CONV EOSC EOSC: Enable oscillator. When set to logic 0, the oscillator is started. When set to logic 1, the oscillator is stopped when the device switches to V BIT 7 device is ...
Page 14
I C Real-Time Clock V POWERED CC INTERNAL 1Hz CLOCK BSY CONV THE USER SETS THE CONV BIT V POWERED BAT INTERNAL 1Hz CLOCK BSY CONV Figure 7. CONV Control Bit and BSY Status Bit Operation 14 THE ...
Page 15
BIT_7 BIT_6 BIT_5 OSF OSF: Oscillator stop flag. A logic 1 in this bit indicates that the oscillator either is stopped or was stopped for some period and could be used to judge the validity of the ...
Page 16
I C Real-Time Clock Temperature_Register_(Upper_Byte_=_11h) BIT_7 BIT_6 SIGN DATA 0 0 Temperature_Register_(Lower_Byte_=_12h) BIT_7 BIT_6 DATA DATA 0 0 Temperature is represented as a 10-bit code with a resolution of 0.25°C and is accessible at location 11h and 12h. ...
Page 17
Bit_ Write: Transitions of SDA must occur during the low state of SCL. The data on SDA must remain valid and unchanged during the entire high pulse of SCL plus the setup and hold time requirements (see Figure 1). Data ...
Page 18
... After the master reads the last byte it must NACK to indicate the end of the transfer and then it generates a STOP condition. Applications Information Power-Supply Decoupling To achieve the best results when using the DS3231M, decouple the V and/ BAT 0.1FF and/or 1.0FF capacitors. Use a high-quality, ceramic, surface-mount capacitor if possible ...
Page 19
... For the latest package outline information and land patterns (footprints www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. ...
Page 20
... Absolute Maximum Ratings section 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. ...