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| 型号： | PCA2002CX8/5/1,025 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 29/30页 |
| 文件大小： | 0K |
| 描述： | IC WATCH CIRCUIT 32KHZ DIE |
| 标准包装： | 15,064 |
| 系列： | * |
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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
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)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCA2002T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
| PCA2002TK | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
| PCA2002TK/1,118 | 功能描述:马达/运动/点火控制器和驱动器 WATCH IC RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| PCA2002TK-T | 功能描述:马达/运动/点火控制器和驱动器 WATCH IC RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| PCA2002U/10AA | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:32 kHz watch circuit with programmable output period and pulse width |
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