Ambiq AM1803 Real Time Clock How2 Info Sheet Ambiq AM1803 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 AM1803 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 XXX 4x5 XXX 7x7 XXX 9x9 Advantages of Combining These Two Parts VCHG C2 EN RESET VIN VOUT GND C1 1.0uF CN 1 C3 1.0uF R4 200K 2 3 4 R1 10K R2 10K 16 U2 XI 13 0.1uF VMODE 14 VBAT System power 32.768KHz CP GND •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 Y1 U1 CBC31XX 15 Cymbet EnerChips are solid-state, rechargeable batteries with the following characteristics when compared to conventional rechargeable batteries: VSS nc VCC nc nc FOUT/nIRQ XO AM1803 nc nc PSW/nIRQ2 VSS VBAT SDA SCL 5 6 7 12 11 INT/ to MCU if needed 10 9 nc 8 Power switch to other devices if needed I2C SCL I2C SDA Documentation •Cymbet Application Note: AN-XXXX •Cymbet Evaluation Kits: CBC-EVAL-05B, CBC-EVAL-06 •Data Sheets: Ambiq AM1803, 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 Page 1 of 1