PCA2002_5

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 05 — 11 November 2008

6 of 25

NXP Semiconductors

PCA2002

32 kHz watch circuit programmable output period and pulse width

7.5 Type recognition

Byte D is read to determine which type of the PCA200x family is used in a particular

application.

Table 5.

Description of word A bits

Bit

Value

Description

Inhibit time

1 to 7

-

adjust the number of the 8192 Hz pulses to be removed;

bit 1 is the MSB and bit 7 is the LSB

Calibration period

8

0

1 minute

1

2 minutes

Table 6.

Description of word B bits

Bit

Value

Description

1 to 3

000

0.98

001

1.95

010

2.9

011

3.9

100

4.9

101

5.9

110

6.8

111

7.8

Output period (s)

4 to 6

000

1

001

5

010

10

011

20

100

30

Duty cycle of motor pulse

7

0

75 %

1

100 %

Pulse stretching

8

0

no pulse stretching

1

a pulse width of 2

Table 7.

Description of word D bits

Bit

Value

Description

Type recognition

1 to 4

0000

PCA2002

1000

PCA2000

0100

PCA2001

1100

PCA2003