Ambiq AM1803 Real Time Clock
How2 Info Sheet
Ambiq AM1803 RTC Power Backup with EnerChip™ Battery
IP
ENERCH -D9C
0
CBC315
™
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
Iq (nA at 3V)
XXX
Back up
time (hrs)
XXX
Package Size
(mm x mm)
4x5
Back up
time (hrs)
XXX
Package Size
(mm x mm)
7x7
Back up
time (hrs)
XXX
Package Size
(mm x mm)
9x9
Advantages of Combining These Two Parts
15
14
VSS
VMODE
EN
VIN
GND
GND
C1
1.0uF
•
•
•
•
•
•
•
•
•
•
•
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
System power
CN
RESET
VOUT
C3
1.0uF
R4
200K
1
2
3
4
XO
13
VCC
nc
Cymbet EnerChips are solid-state, rechargeable batteries with
the following characteristics when compared to conventional
rechargeable batteries:
U1 CBC31XX
Y1
32.768KHz
VCHG
VBAT
CP
C2
0.1uF
16
U2
XI
nc
nc
AM1803
12
11
10
9
INT/ to MCU if needed
FOUT/nIRQ
nc
VSS
SCL
7
nc
8
nc
PSW/nIRQ2
VBAT
SDA
6
R1
10K
R2
10K
5
Power switch to other devices if needed
I2C SCL
I2C SDA
Documentation
Cymbet Application Note:
AN-XXXX
Cymbet Evaluation Kits:
Data Sheets:
All Cymbet Documents and Downloads:
Evaluation Kits
Cymbet EnerChip
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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