CBC34123 EnerChip™ RTC

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DS-72-31 V.13

Page 3 of 14

Preliminary

Pin Number

Label

Description

1

OSCO

Oscillator output; high-impedance node; minimize wire length between

quartz and package

2

TEST

Test pin; not user accessible; connect to VSS or leave floating (internally

pulled down)

3

INT/

Interrupt output (open-drain; active LOW)

4

CE

Chip enable input (active HIGH) with internal pull down

5

VSS

Ground

6

VCHG

4.1V (typical) charging source - connect to VEC and/or optional EnerChip(s)

for extended backup time

7

VEC

Positive terminal of integrated thin film battery - connect only to VCHG via

PCB trace

8

SDO

Serial data output, push-pull; high-impedance when not driving; can be con-

nected to SDI for single wire data line

9

SDI

Serial data input; may float when CE is inactive

10

SCL

Serial clock input; may float when CE is inactive

11

CLKOE

CLKOUT enable or disable pin; enable is active HIGH; connect to VSS for low

power operation

12

CLKOUT

Clock output (open-drain)

13

VDD

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

mance; recommend 100nF decoupling close to the device

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

OSCI

Oscillator input; high-impedance node; minimize wire length between quartz

and package

CBC34123 Input/Output Descriptions

Figure 4: CBC34123 Package (left: top view, looking through package; right: pad dimensions)

EnerChip Properties

Energy capacity (typical):

5µAh

Recharge time to 80%:

10 minutes

Charge/discharge cycles:

>5000 to 10% depth-of-discharge

Operating temperature:

-30°C to +70°C

Storage temperature:

-40°C to +125°C

Minimum VDD to charge EnerChip:

2.5V

Package

Dimensions

(mm)