CBC34813 EnerChip™ RTC

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DS-72-38 V.01

Page 3 of 9

Preliminary

Pin Number

Label

Description

1

XO

Crystal output

2

VCAP

External capacitor connection to supply switchover current at cold temp.

(optional)

3

nIRQ2

Interrupt 2 / Output

4

nCE

RTC SPI chip select

5

VSS

Ground

6

VCHG

4.1V (typical) charging source - connect to VBAT and/or optional

EnerChip(s)

7

VEC

Positiveterminalofintegratedthinfilmbattery-connecttoonlytoVCHG

via PCB trace

8

SDO

SPI-bus data output

9

SDI

SPI-bus data input

10

SCL

SPI-bus interface clock

11

AF

Autocalibrationfilter

12

FOUT/nIRQ

Interrupt 1 / Function output

13

VDD

Supply voltage; positive or negative steps in VDD can affect oscillator per-

formance; recommend 100nF decoupling close to the device (see Fig. 30)

14

RESET/

Output signal indicating RTC is operating in backup power mode

15

EN

Charge pump enable; activates VCHG 4.1V (typ.) charging source

16

XI

Crystal input

CBC34813 Input/Output Descriptions

EnerChip Properties

Energy capacity (typical):

5µAh

Recharge time to 80%:

<15 minutes

Charge/discharge cycles:

>5000 to 10% depth-of-discharge

Operating temperature:

-10°C to +70°C

Storage temperature:

-40°C to +125°C

Minimum VDD to charge EnerChip:

2.5V

Figure 4: CBC34813 Package (left: top view, looking through package; right: pad dimensions)

Package

Dimensions

(mm)