E1466D Datasheet, PDF(6/8 Page) ATMEL Corporation – 32 KHZ CLOCK CMOS IC WITH DIGITAL TRIMMING

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E1466D Datasheet, PDF (6/8 Pages) ATMEL Corporation – 32 KHZ CLOCK CMOS IC WITH DIGITAL TRIMMING

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Test Crystal

Specification

Oscillation frequency

Series resistance

Static capacitance

Dynamic capacitance

Load capacitance

fOSC = 32768 Hz

RS = 30 kW

C0 = 1.5 pF

C1 = 3.0 fF

CL optionally 10 or 12.5 pF

Figure 3. Motor Output Signal During Normal Operation and During Motor Test

Detail a

TEST

MOT1

MOT2

TMT

Detail a:

1/fTEST

VDD

VSS

VDD

VSS

VDD

VSS

Figure 4. Typical Trimming Curve Characteristic for TM of 2 s

2.00006

2.00005

2.00004

2.00003

2.00002

COX = 1.05

COX = 1.00

COX = 0.95

2.00001

2.00000

1.99999

1.99998

1.99997

1.99996

1.99995

1.99994

1.99993

1.99992

1.99991

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Trimming Step

COX means frequency deviation due to production process variations.

Trimming inputs C1 ... C4 are binary weighted, i.e.,

C1 ... C4 = 0 corresponds to trimming step 0

C1 ... C4 = 1 corresponds to trimming step 15

LSB = C1

6 e1466D

4731AâCLOCKâ06/03

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