Preliminary
CBC34813 EnerChip™ RTC
CBC34813 Input/Output Descriptions
Pin Number
1
Label
XO
Description
Crystal output
External capacitor connection to supply switchover current at cold temp.
(optional)
2
VCAP
3
4
5
nIRQ2
nCE
Interrupt 2 / Output
RTC SPI chip select
Ground
VSS
4.1V (typical) charging source - connect to VBAT and/or optional
EnerChip(s)
6
7
VCHG
VEC
Positiveꢀterminalꢀofꢀintegratedꢀthinꢀfilmꢀbatteryꢀ-ꢀconnectꢀtoꢀonlyꢀtoꢀVCHGꢀ
via PCB trace
8
SDO
SDI
SPI-bus data output
SPI-bus data input
9
10
11
12
SCL
SPI-bus interface clock
Autocalibrationꢀfilter
AF
FOUT/nIRQ
Interrupt 1 / Function output
Supply voltage; positive or negative steps in VDD can affect oscillator per-
formance; recommend 100nF decoupling close to the device (see Fig. 30)
13
VDD
14
15
16
RESET/
EN
Output signal indicating RTC is operating in backup power mode
Charge pump enable; activates VCHG 4.1V (typ.) charging source
Crystal input
XI
Package
Dimensions
(mm)
Figure 4: CBC34813 Package (left: top view, looking through package; right: pad dimensions)
EnerChip Properties
Energy capacity (typical):
Recharge time to 80%:
5µAh
<15 minutes
Charge/discharge cycles:
Operating temperature:
Storage temperature:
>5000 to 10% depth-of-discharge
-10°C to +70°C
-40°C to +125°C
2.5V
Minimum VDD to charge EnerChip:
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DS-72-38 V.01
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