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PCA1461

32 kHz watch circuits with adaptive motor pulse

NXP Semiconductors. 

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t SONF = 488 µs

STAGE 1

STAGE 2

STAGE 3

STAGE 4

STAGE 5

STAGE 8

t SON

t DF = 977 µs

t P3 = 3.9 ms

t P2 = 5.86 ms

t P1 = 7.81 ms

t SOFF

t ONL

t ON = t SON t DF

= t DF t SOFF

t DF

56.25 %

62.50 %

68.75 %

75.00 %

81.25 %

100.00 %

MSA947

tOFF for stage 1 to 5 = 488 µs − stage × 61 µs

tON for stage 1 to 5 = 488 µs + stage × 61 µs

Fig.3 Motor pulses in the silver-oxide mode (VDD = 1.55 V).

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