Epson RX-8564 Real Time Clock
How2 Info Sheet
Epson RX-8564 RTC Power Backup with EnerChip™ Battery
ENERCHIP™
CBC3150-D9C
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-to-
reach 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
RX-8564
CBC3105
CBC3112
CBC3150
Iq (nA at 3V)
Back up
time (hrs)
Package Size
(mm x mm)
Back up Package Size Back up Package Size
time (hrs) (mm x mm) time (hrs) (mm x mm)
275
18
4 x 5
44
7 x 7
182
9 x 9
Advantages of Combining These Two Parts
Cymbet EnerChips are solid-state, rechargeable batteries with
the following characteristics when compared to conventional
rechargeable batteries:
U1 EnerChip CBC31xx
VCHG
CP
CN
C2
0.1uF
VBAT
VMODE
EN
RESET
VOUT
• Low self-discharge
R3
100K
System power
VIN
• Are solder reflow tolerant
• Flat discharge voltage profile
GND
GND
C1
R1 1.0uF
10K
C3
1.0uF
U2 Epson RX-8564
R2
10K
10
5
INT/
VDD
INT
• High charge/discharge cycle life
9
CLKOUT
CLKOE
11
• Simple voltage controlled charging
• Have no flammable solvents to leak or catch fire
• Are offered in low profile surface mount packages
10
7
I2C SCL
I2C SDA
SCL
SDA
6
GND
Documentation
• Cymbet Application Note: AN-1042
• Cymbet Evaluation Kits: CBC-EVAL-05B, CBC-EVAL-06
• Data Sheets: Epson RX-8564, CBC3105, CBC3112, CBC3150
• All Cymbet Documents and Downloads: http://www.cymbet.com/products/datasheets-downloads.php
Evaluation Kits
Cymbet EnerChip
CBC-EVAL-05B
Cymbet EnerChip
RTC CBC-EVAL-06
©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
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