參數(shù)資料
型號(hào)： PCA2002U/AB/1,026
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 29/30頁(yè)
文件大?。?/td> 0K
描述： IC WATCH CIRCUIT 32KHZ DIE
標(biāo)準(zhǔn)包裝： 3,600
系列： *
PCA2002
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 8 — 25 November 2011
8 of 30
NXP Semiconductors
PCA2002
32 kHz watch circuit with programmable output period and pulse width
8.6 Programming procedure
To ensure that the oscillator starts up correctly you must execute a reset sequence (see
For a watch it is essential that the timing calibration can be made after the watch is fully
assembled. In this situation, the supply pins are often the only terminals which are still
accessible.
Writing to the OTP cells and performing the related functional checks is achieved in the
PCA2002 by modulating the supply voltage. The necessary control circuit consists
basically of a voltage level detector, an instruction counter, which determines the function
to be performed, and an 8-bit shift register, which allows writing the OTP cells of an 8-bit
word in one step and which acts as data pointer for checking the OTP content.
State 1; measurement of the crystal oscillator frequency (divided by 1024)
State 2; measurement of the inhibition time
State 3; write/check word A
State 4; write/check word B
State 5; check word C (don’t care since no meaning)
State 6; check word D (type recognition)
Each instruction state is switched on with a pulse to VP(prog)(start). After this large pulse, an
initial waiting time of t0 is required. The programming instructions are then entered by
modulating the supply voltage with small pulses (amplitude VP(mod) and pulse width tmod).
The first small pulse defines the start time, the following pulses perform three different
functions, depending on the time delay (td) from the preceding pulse (see Figure 5,
td =t1 (0.7 ms); increments the instruction counter
td =t2 (1.7 ms); clocks the shift register with data = logic 0
td =t3 (2.7 ms); clocks the shift register with data = logic 1
The programming procedure requires a stable oscillator, which means that a waiting time,
determined by the start-up time of the oscillator, is necessary after power-up of the circuit.
td(start): start delay time.
VDD(nom): nominal supply voltage.
Fig 4.
Supply voltage at start-up during production and testing
VDD
VP(prog)(stop)
td(start) > 500 ms
VSS
VDD(nom)
001aac503
tp(stop)
相關(guān)PDF資料
PDF描述
SB4011NOH-2A SWITCH PUSH SPST-NO 3A 125V
SB4011NOM-2A SWITCH PUSH SPST-NO 3A 125V
SB4011NOH-2E SWITCH PUSH SPST-NO 3A 125V
SB4011NOM-2E SWITCH PUSH SPST-NO 3A 125V
SB4011NOH-2B SWITCH PUSH SPST-NO 3A 125V
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCA2003 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse and pulse period
PCA2003_09 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse and pulse period
PCA2003U/10AA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse and pulse period
PCA2003U/10AA/1 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse and pulse period
PCA2003U/10AC/1 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable adaptive motor pulse and pulse period
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*