Datasheet > PCA8802U/12KB/1

PCA8802U/12KB/1

更新时间： 2024-01-31 12:49:25

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
42页	538K
描述
IC SPECIALTY ANALOG CIRCUIT, Analog IC:Other

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PCA8802U/12KB/1 技术参数

PCA8802

Smartcard RTC; ultra low power oscillator with integrated

counter for initiating one time password generation

Rev. 4 — 27 September 2012

Product data sheet

1. General description

The PCA8802 is a CMOS integrated circuit for battery operation, typically supplied by

button cells or flexible polymer batteries. Incorporated is a 32.768 kHz quartz crystal

oscillator circuit including the two load capacitors. The circuit is optimized for a quartz with

6 pF load capacitance specification. Higher values can also be used with the addition of

external load capacitors.

The main function of the oscillator is to generate a ¹⁄₃₂Hz clock signal which is used to

increment a 24 bit binary counter. The counter can be read over the serial interface and

may also be set to any desired value. Control over the divider chain also allows for

accurate starting of the counter. Incrementing of the counter value during read is

prevented by freezing of the counter during access.

An interrupt signal is also available and is triggered coincident with the counter updating.

This signal may be used as a wake-up for a microcontroller.

2. Features and benefits

 32.768 kHz quartz oscillator, amplitude regulated with excellent frequency stability and

high immunity to leakage currents

 Very low current consumption: typically 130 nA

 Two wire serial interface (I²C-bus)

 Integrated 24 bit counter with auto increment every 32 seconds

 Interrupt output for processor wake-up

 Stop function for accurate time setting and current saving during shelf life

 User test modes for accelerated application testing and development

 Two integrated quartz crystal oscillator capacitors

3. Applications

 One time password function generators

 Ultra low power time keeper circuit

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