Preliminary
CBC34803 EnerChip™ RTC
I
2
C Real-Time Clock/Calendar with Integrated Backup Power
Features
•
Ultra low power Real Time Clock with Integrated
rechargeable EnerChip™ solid state battery,
power-fail detect and automatic switchover,
providing greater than 5 days (typical) of RTC
backup
5mm x 5mm x 1.4mm QFN package is the
smallest commercially available RTC having
integrated backup battery power
Temperature-compensated charge control
Integrated EnerChip™ recharged at VDD > 2.5V
SMT assembly - lead-free reflow solder tolerant
Counters for hundredths, seconds, minutes,
hours, date, month, year, century, and weekday
based on a 32.768 kHz oscillator
Automatic leap year calculation
Alarm capability on all counters
2 general purpose outputs
64 bytes of RAM
Advanced crystal calibration to ± 2 ppm
Advanced RC calibration to ± 16 ppm
Automatic calibration of RC oscillator to crystal
oscillator
I
2
C-bus (up to 400kHz)
Eco-friendly, RoHS compliant - tested
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
5mm x 5mm x 1.4mm 16-pin QFN Package
General Description
Applications
Power bridging
to provide uninterruptible RTC
function during exchange of main batteries.
Consumer appliances
that have real-time
clocks; provides switchover power from main
supply to backup battery.
Ultra Low Power Timers
using only 35nA can be
implemented with the CBC34803
Wireless sensors and RFID tags
and other
powered, low duty cycle applications.
Business and industrial systems
such as:
network routers, point-of-sale terminals, single-
board computers, test equipment, multi-function
printers, industrial controllers, and utility meters.
• Time keeping application
• Battery powered devices
• Metering
• High duration timers
• Daily alarms
• Low standby power applications
The EnerChip RTC CBC34803-M5C combines a
Real-Time Clock (RTC) and calendar optimized
for low power applications with an integrated
rechargeable solid state backup battery and all power
management functions. The EnerChip RTC ensures
a seamless transition from main power to backup
power in the event of power loss. The integrated
power management circuit ensures thousands of
charge-discharge cycles from the integrated EnerChip
and manages battery charging, discharge cutoff,
power switchover, and temperature compensation
to maximize the service life of the device. The
CBC34803 provides greater than 5 days of backup
time in the event main power is interrupted. Longer
backup time can be achieved by adding an external
EnerChip to the VCHG pin. The integrated EnerChip
recharges quickly, has extremely low self-discharge, is
non-flammable, and RoHS-compliant. The EnerChip is
charged automatically anytime VDD is above 2.5V.
Data is transferred serially via an I
2
C-bus. Alarm and
timer functions provide the option to generate a
wake-up signal on an interrupt pin.
XI
XO
Figure 1: CBC34803 Pin-out Diagram
DS-72-34 V.20
©2014-2015 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 1 of 18
Preliminary
CBC34803 EnerChip™ RTC
CBC34803 Input/Output Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Label
XO
VOUT
nIRQ2
NC
VSS
VCHG
VEC
SDA
NC
SCL
AF
FOUT/nIRQ
VDD
RESET/
EN
XI
Description
Crystal output
CBC910 VOUT
Interrupt 2 / Output
No connection
Ground
4.1V (typical) charging source - connect to VEC (and to optional EnerChip
bare die battery for extended backup time if used)
Positive terminal of integrated thin film battery - connect only to VCHG via
PCB trace
I
2
C data input / Output
No connection
I
2
C clock input
Autocalibration filter
Interrupt 1 / Function output - (note this is an open drain output)
Supply voltage; positive or negative steps in VDD can affect oscillator per-
formance; recommend 100nF decoupling close to the device
Output signal indicating RTC is operating in backup power mode
Charge pump enable; activates VCHG 4.1V (typ.) charging source
Crystal input
Package
Dimensions
(mm)
Figure 4: CBC34803 Package (left: top view, looking through package; right: pad dimensions)
EnerChip Properties
Energy capacity (typical):
Recharge time to 80%:
Charge/discharge cycles:
Operating temperature:
Storage temperature:
Minimum VDD to charge EnerChip:
DS-72-34 V.20
5µAh
<15 minutes
>5000 to 10% depth-of-discharge
-10°C to +70°C
-40°C to +125°C
2.5V
Page 3 of 18
©2014-2015 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Preliminary
CBC34803 EnerChip™ RTC
Absolute Maximum Ratings
PARAMETER / PIN
V
DD
with respect to GND
ENABLE Input Voltage
V
EC
(1)
V
CHG
VOUT
XI, XO, SDA, SCL, AF, FOUT/nIRQ,
nIRQ2
(1)
(1)
CONDITION
25°C
25°C
25°C
25°C
25°C
25°C
MIN
GND - 0.3
GND - 0.3
3.0
3.0
GND - 0.3
GND - 0.3
TYPICAL
-
-
-
-
-
-
MAX
3.6
V
DD
+0.3
4.15
4.15
2.7
3.6
UNITS
V
V
V
V
V
V
RESET Output Voltage
See Ambiq Micro AM0803 Data Sheet
No external connections to these pins are allowed, except parallel EnerChips for extended backup time.
Integrated EnerChip Thin Film Battery Operating Characteristics
PARAMETER
Self-Discharge (5 yr. average)
Operating Temperature
Storage Temperature
Recharge Cycles
(to 80% of rated
capacity)
25°C
40°C
CONDITION
Non-recoverable
Recoverable
MIN
-
-
-10
-40
5000
1000
2500
500
-
-
5
TYPICAL
2.5
1.5
(1)
25
-
-
-
-
-
11
45
-
MAX
-
-
+70
+125
(2)
-
-
-
-
22
70
-
UNITS
% per year
% per year
°C
°C
cycles
cycles
cycles
cycles
minutes
µAh
-
-
10% depth-of-discharge
50% depth-of discharge
10% depth-of-discharge
50% depth-of-discharge
Charge cycle 2
Charge cycle 1000
40nA discharge; 25°C
Recharge Time (to 80% of rated
capacity; 4.1V charge; 25°C)
Capacity
(1)
(2)
First month recoverable self-discharge is 5% average.
Storage temperature is for uncharged EnerChip CC device.
Note: All specifications contained within this document are subject to change without notice.
DS-72-34 V.20
©2014-2015 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Page 4 of 18
无线连接
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
