general description the DS3231MPMB1 peripheral module provides the nec - essary hardware to interface the ds3231m real-time clock (rtc) to any system that utilizes pmod k -compatible expansion ports configurable for i 2 c communication. the ic is a low-cost and extremely accurate i2c rtc. the device incorporates a battery input and maintains accurate timekeeping when main power to the device is interrupted. the integration of the microelectromechani - cal systems (mems) resonator enhances the long-term accuracy of the device and reduces the piece-part count in a manufacturing line. the device is available in the same footprint as the popular ds3231 rtc. refer to the ds3231m ic data sheet for detailed informa - tion regarding operation of the ic. features s high accuracy time-of-day and date (5ppm) from -40c to +85c s 32.768khz square-wave output s digital temp sensor with 3 n c accuracy s 6-pin pmod-compatible connector (i 2 c) s example software written in c for portability s secondary header allows daisy-chaining of additional modules on the i 2 c bus s rohs compliant s proven pcb layout s fully assembled and tested _________________________________________________________________ maxim integrated products 1 DS3231MPMB1 peripheral module 19-6337; rev 0; 5/12 ordering information appears at end of data sheet. pmod is a trademark of digilent inc. DS3231MPMB1 peripheral module for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
designation qty description bat1 1 battery holder memory protection devices bh401 c1 1 1 f f q 10%, 10v x7r ceramic capacitor (0603) tdk c1608x7r1a105k c2 1 0.1 f f q 10%, 10v x74 ceramic capacitor (0603) murata grm188r71c104ka01d designation qty description j1 1 6-pin right-angle male header j2 1 8-pin (2 x 4) straight male header r1Cr4 4 150 i q 5% resistors (0603) r5Cr8 4 4.7k i q 5% resistors (0603) u1 1 q 5ppm, i 2 c real-time clock (8 so) maxim max3231mz+ 1 pcb: epcb3231pm1 pin signal description 1 rst active-low reset. this pin is an open- drain input/output. it is pulled low if v cc falls below threshold. this output is combined with a debounced pushbutton input function that can be activated to cause a reset request. 2 int /sqw active-low interrupt or 1hz square-wave output. interrupt function is activated when alarm occurs. 3 scl i 2 c serial clock 4 sda i 2 c serial data 5 gnd ground 6 vcc power supply pin signal description 1 scl i 2 c serial clock 2 sda i 2 c serial data 3 gnd ground 4 vcc power supply 5 scl 2-wire serial clock (same as pin 1 above) 6 sda 2-wire serial data (same as pin 2 above) 7 gnd ground 8 vcc power supply supplier phone website murata electronics north america, inc. 770-436-1300 www.murata-northamerica.com tdk corp. 847-803-6100 www.component.tdk.com _________________________________________________________________ maxim integrated products 2 detailed description i 2 c interface the DS3231MPMB1 peripheral module can interface to the host in one of two ways. it can plug directly into a pmod-compatible port (configured for i 2 c) through con - nector j1, or in this case, other i 2 c boards can attach to the same i 2 c bus through connector j2. i 2 c interface (daisy-chaining modules) alternatively, the peripheral module can connect to other i 2 c-based pmod modules using a 4-conductor ribbon cable connecting to the j2 connector. in this situation, pins 1-4 and 5-8 of j2 provide two connections to the i 2 c bus, allowing the module to be inserted into an i 2 c bus daisy-chain. connector j1 provides connection of the module to the pmod host. the pin functions and pin assignments adhere to the pmod standard recommended by digilent. see table 1. the j2 connector allows the module to be connected through a daisy-chain from another i 2 c module and/or provide i 2 c and power connections to other i 2 c modules on the same bus. see table 2. battery backup the peripheral module contains a battery holder for a lithium coin cell battery. the battery allows the ic to retain settings and time in the event of main power loss. note: a battery must be present for the DS3231MPMB1 to operate properly. component list component suppliers note: indicate that ou are using the mpm hen contacting these component suppiers. table 1. connector j1 (i 2 c communication) table 2. connector j2 (i 2 c expansion) DS3231MPMB1 peripheral module
gn d vc c gn d sc l sd a 32 khz vb at vc c gn d 1 32 khz 32 khz 1 vc c 2 in t/ sq w 3 rst 4 gn d 5 vb at 6 sd a 7 scl 8 ds 32 31 m u1 scl sd a gn d vc c in t/ sq w 4. 7k r6 vc c vc c gn d 4. 7k r7 15 0 r2 15 0 r3 15 0 r4 15 0 r1 rst 1u f c1 0. 1u f c2 4. 7k r8 vc c vc c 4. 7k r5 b+ 1 b- 2 ba t1 1 2 3 4 5 6 j1 1 2 3 4 5 6 7 8 j2 _________________________________________________________________ maxim integrated products 3 software and fpga code example software and drivers are available that execute directly without modification on several fpga devel - opment boards tha support an integrated or synthe - sized microprocessor. these boards include the digilent nexys 3, avnet lx9, and avnet zedboard, although other platforms can be added over time. maxim provides complete xilinx ise projects containing hdl, platform studio, and sdk projects. in addition, a synthesized bit stream, ready for fpga download, is provided for the demonstration application. the software project (for the sdk) contains several source files intended to accelerate customer evalu - ation and design. these include a base application (maximmodules.c) that demonstrates module function - ality and uses an api interface (maximdevicespecific utilities.c) to set and access maxim device functions within a specific module. the source code is written in standard ansi c format, and all api documentation including theory/operation, regis - ter description, and function prototypes are documented in the api interface file (maximdevicespecificutilities.h & .c). the complete software kit is available for download at www.maxim-ic.com . quick start instructions are also available as a separate document. figure 1. DS3231MPMB1 peripheral module schematic DS3231MPMB1 peripheral module
_________________________________________________________________ maxim integrated products 4 figure 2. DS3231MPMB1 peripheral module component placement guidecomponent side figure 3. DS3231MPMB1 peripheral module pcb layoutcomponent side figure 4. DS3231MPMB1 peripheral module pcb layoutinner layer 1 (power) DS3231MPMB1 peripheral module
_________________________________________________________________ maxim integrated products 5 figure 5. DS3231MPMB1 peripheral module pcb layoutinner layer 2 (ground) figure 6. DS3231MPMB1 peripheral module pcb layoutsolder side figure 7. DS3231MPMB1 peripheral module component placement guidesolder side DS3231MPMB1 peripheral module
part type DS3231MPMB1# peripheral module _________________________________________________________________ maxim integrated products 6 ordering information # denotes rohs compliant. DS3231MPMB1 peripheral module
revision number revision date description pages changed 0 5/12 initial release 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 7 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history DS3231MPMB1 peripheral module
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