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DS1689/DS1693

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PERIODIC INTERRUPT RATE AND

SQUARE WAVE OUTPUT FREQUENCY Table 2

EXT. REG. B SELECT BITS REGISTER A

E32K RS3 RS2 RS1 RS0

PERIODIC

INTERRUPT RATE

SQW OUTPUT

FREQUENCY

0 0000None None

0 00013.90625 ms 256 Hz

0 00107.8125 ms 128 Hz

0 0011

122.070 ms

8.192 kHz

0 0100

244.141 ms

4.096 kHz

0 0101

488.281 ms

2.048 kHz

0 0110

976.5625 ms

1.024 kHz

0 01111.953125 ms 512 Hz

0 10003.90625 ms 256 Hz

0 10017.8125 ms 128 Hz

0 101015.625 ms 64 Hz

0 101131.25 ms 32 Hz

0 110062.5 ms 16 Hz

0 1101125 ms 8 Hz

0 1110250 ms 4 Hz

0 1111500 ms 2 Hz

1 XXXX* 32.768 kHz

*RS3-RS0 determine periodic interrupt rates as listed for E32K=0.

The third method uses a periodic interrupt to determine if an update cycle is in progress. The UIP bit in

that occur at a rate of greater than t

BUC

allow valid time and date information to be reached at each

occurrence of the periodic interrupt. The reads should be complete within (t

/ 2+t

BUC

) to ensure that data

is not read during the update cycle.

UPDATE-ENDED AND PERIODIC INTERRUPT RELATIONSHIP Figure 3

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 31 32

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