Microchip MDP79410 Real Time Clock How2 Info Sheet Microchip MDP79410 RTC Power Backup with EnerChip™ Battery IP™ ENERCH -D9C 0 5 1 3 CBC Applications EnerChips are an attractive RTC backup alternative to batteries or supercapacitors, especially when the finished product has limited PCB space, size constraints or needs to be sealed or installed in a hard-toreach location. They are also excellent if you have any of these design requirements: • • • • • Battery must be RoHS and WEEE compliant Product can be discarded without removing battery Product must have battery installed during shipping via air Battery must be rechargeable to support a lifetime of power outages Battery must provide backup power for several hours during a main power failure MDP79410 CBC3105 CBC3112 CBC3150 Iq (nA at 3V) Back up time (hrs) Package Size (mm x mm) Back up time (hrs) Package Size (mm x mm) Back up time (hrs) Package Size (mm x mm) XXX XX 4x5 XXX 7x7 XXX 9x9 Advantages of Combining These Two Parts Cymbet EnerChips are solid-state, rechargeable batteries with the following characteristics when compared to conventional rechargeable batteries: Low self-discharge Are solder reflow tolerant Flat discharge voltage profile High charge/discharge cycle life Simple voltage controlled charging Have no flammable solvents to leak or catch fire Are offered in low profile surface mount packages Documentation • • • • Y1 32.768KHz 1 2 3 C4 4 GND R1 U1 MCP7941X X1 VCC X2 IRQ/CLK VBAT SCL VSS SDA R2 7 IRQ*/CLK 6 SCL 5 SDA U2 CBC31XX VCHG CP C1 VBAT 0.1uF VMODE EN VCC C2 1.0uF CN EN RESET VIN VOUT RESET/ C3 1.0uF Cymbet Application Note: AN-1046 Cymbet Evaluation Kits: CBC-EVAL-05B, CBC-EVAL-06 Data Sheets: Microchip MDP79410, CBC3105, CBC3112, CBC3150 All Cymbet Documents and Downloads: http://www.cymbet.com/products/datasheets-downloads.php Evaluation Kits Cymbet EnerChip RTC CBC-EVAL-06 Cymbet EnerChip CBC-EVAL-05B ©2013 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com Cymbet, the Cymbet Logo and EnerChip are trademarks of Cymbet Corporation. All Rights Reserved Doc MD-72-0XX Rev A R3 8 GND • • • • • • • C5 Page 1 of 1