PCA2003USLASH10AASLASH1 datasheet(14/21 Pages) NXP

Part #	PCA2003U/10AA/1

Description	32 kHz watch circuit with programmable adaptive motor pulse and pulse period

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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PCA2003_2

Product data sheet

Rev. 02 — 21 July 2009

14 of 21

NXP Semiconductors

PCA2003

32 kHz watch circuit with programmable adaptive motor pulse

• State 1: quartz crystal oscillator frequency divided by 1024; state 1 starts with a pulse

to VP and ends with a second pulse to VP

• State 2: inhibition time has a value of n

× 0.122 ms. A signal with periodicity of

31.25 ms + n

× 0.122 ms appears at pad RESET and as current modulation at

pad VDD (see Figure 11 and Figure 12)

7.11 Customer testing

Connecting pad RESET to VSS activates the test mode. In this test mode, the motor

output frequency is 8 Hz; the duty cycle reduction and battery check occurs every second,

instead of every 4 minutes.

Fig 11. Output waveform at pad RESET for instruction state 2

VDD(nom): nominal supply voltage.

Fig 12. Supply voltage modulation for starting and stopping of instruction state 2

mgw355

VDD

VSS

31.25 ms

+ inhibition time

VO(dif)

VDD

VP(prog)(start)

VP(mod)

VP(prog)(stop)

tp(start)

VSS

VDD(nom)

mgu719

tp(stop)

PCA2003U/10AA/1 Datasheet(PDF) 14 Page - NXP Semiconductors