參數(shù)資料
型號(hào)： PCA2002CX8/5/1,025
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 2/30頁(yè)
文件大小： 0K
描述： IC WATCH CIRCUIT 32KHZ DIE
標(biāo)準(zhǔn)包裝： 15,064
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
10 of 30
NXP Semiconductors
PCA2002
32 kHz watch circuit with programmable output period and pulse width
8.8 Checking the memory content
The stored data of the OTP array can be checked bit wise by measuring the supply
current (see Figure 6). The array word is selected by the instruction state and the bit is
addressed by the shift register.
To read a word, the word is first selected (td =t1) and a logic 1 is written into the first cell of
the shift register (td =t3). This logic 1 is then shifted through the entire shift register
(td =t2), so that it points with each clock pulse to the next bit.
If the addressed OTP cell contains a logic 1, a 30 k
resistor is connected between V
DD
and VSS; this increases the supply current accordingly.
Figure 6 shows the supply voltage modulation for reading word B, with the corresponding
supply current variation for word B = 110101 (sequence: first MSB and last LSB).
VDD(nom): nominal supply voltage.
(1)
Fig 6.
Supply voltage modulation for reading word B
VDD(nom)
VDD
VP(mod)
(1)
VSS
t0
mgw357
IDD
t1 t1
t3
t2
t1
t2
VP(prog)(start)
tp(start)
VP(prog)(stop)
tp(stop)
I
DD
V
DD
30 k
---------------
=
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PCA2002TK-T 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 WATCH IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
PCA2002U/10AA 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width
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