DS-72-34 Datasheet, PDF (3/18 Pages) Cymbet Corporation – I2C Real-Time Clock/Calendar with Integrated Backup Power

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
I²C data input / Output
No connection
I²C 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:
5µAh
<15 minutes
>5000 to 10% depth-of-discharge
-10°C to +70°C
-40°C to +125°C
2.5V
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DS-72-34 V.20

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