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PCF8564A 数据表(PDF) 85 Page - NXP Semiconductors |
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PCF8564A 数据表(HTML) 85 Page - NXP Semiconductors |
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85 / 86 page  NXP Semiconductors PCA2131 Nano-power highly accurate RTC with integrated quartz crystal for automotive applications Contents 1 General description ............................................ 1 2 Features and benefits .........................................1 3 Applications .........................................................2 4 Ordering information .......................................... 2 4.1 Ordering options ................................................ 2 5 Block diagram ..................................................... 3 6 Pinning information ............................................ 4 6.1 Pinning ...............................................................4 6.2 Pin description ................................................... 4 7 Functional description ........................................5 7.1 Register overview .............................................. 5 7.2 Control registers .............................................. 10 7.2.1 Register Control_1 ...........................................10 7.2.2 Register Control_2 ...........................................11 7.2.3 Register Control_3 ...........................................11 7.2.4 Register Control_4 ...........................................12 7.2.5 Register Control_5 ...........................................13 7.3 Register CLKOUT_ctl ...................................... 13 7.3.1 Temperature compensated Real Time Clock ................................................................14 7.3.1.1 Temperature measurement ..............................15 7.3.2 OTP refresh ..................................................... 15 7.3.3 Clock output .....................................................15 7.4 Register Aging_offset ...................................... 16 7.4.1 Crystal aging correction ...................................16 7.5 Power management functions ......................... 17 7.5.1 Battery switch-over function .............................18 7.5.1.1 Standard mode ................................................ 19 7.5.1.2 Direct switching mode ..................................... 19 7.5.1.3 Battery switch-over disabled: only one power supply (VDD) ........................................ 20 7.5.1.4 Battery switch-over architecture ...................... 20 7.5.2 Battery low detection function ..........................20 7.5.3 Battery backup supply ..................................... 21 7.6 Oscillator stop detection function .....................22 7.7 Power-On Reset function ................................ 23 7.7.1 Power-On Reset (POR) ...................................23 7.7.2 Power-On Reset Override (PORO) ................. 24 7.8 Software Reset register ................................... 25 7.8.1 SR - Software reset .........................................25 7.8.2 CPR: clear prescaler ....................................... 26 7.8.3 CTS: clear timestamp ......................................26 7.9 Time and date function ....................................26 7.9.1 Register 100th Seconds .................................. 26 7.9.2 Register Seconds ............................................ 27 7.9.3 Register Minutes ..............................................28 7.9.4 Register Hours .................................................28 7.9.5 Register Days .................................................. 29 7.9.6 Register Weekdays ..........................................29 7.9.7 Register Months .............................................. 30 7.9.8 Register Years ................................................. 31 7.9.9 Setting and reading the time ........................... 31 7.10 Alarm function ..................................................33 7.10.1 Register Second_alarm ................................... 33 7.10.2 Register Minute_alarm .....................................34 7.10.3 Register Hour_alarm ........................................34 7.10.4 Register Day_alarm .........................................35 7.10.5 Register Weekday_alarm .................................36 7.10.6 Alarm flag ........................................................ 36 7.11 Watchdog timer functions ................................ 36 7.11.1 Register Watchdg_tim_ctl ................................ 37 7.11.2 Register Watchdg_tim_val ............................... 37 7.11.3 Watchdog timer function ..................................38 7.11.4 Pre-defined timers: second and minute interrupt ............................................................39 7.11.5 Clearing flags ...................................................39 7.12 Timestamp function ......................................... 40 7.12.1 Timestamp flag ................................................ 40 7.12.2 Timestamp mode ............................................. 41 7.12.3 Timestamp registers ........................................ 41 7.12.3.1 Register Timestp_ctl1/2/3/4 ............................. 41 7.12.3.2 Register Sec_timestp .......................................42 7.12.3.3 Register Min_timestp .......................................42 7.12.3.4 Register Hour_timestp ..................................... 42 7.12.3.5 Register Day_timestp ...................................... 43 7.12.3.6 Register Mon_timestp ......................................43 7.12.3.7 Register Year_timestp ......................................44 7.12.4 Dependency between Battery switch-over and timestamp ................................................. 44 7.13 Interrupt output, INTA/INTB ............................. 44 7.13.1 Minute and second interrupts .......................... 45 7.13.2 INTA/B pulse shortening ..................................47 7.13.3 Watchdog timer interrupts ................................47 7.13.4 Alarm interrupts ............................................... 48 7.13.5 Timestamp interrupts ....................................... 48 7.13.6 Battery switch-over interrupts .......................... 48 7.13.7 Battery low detection interrupts ....................... 48 7.13.8 Interrupt masks ................................................49 7.14 External clock test mode ................................. 50 7.15 STOP bit function ............................................ 51 7.16 Interfaces ......................................................... 52 7.16.1 SPI-bus interface ............................................. 52 7.16.1.1 Data transmission ............................................53 7.16.2 I2C-bus interface ............................................. 54 7.16.2.1 Bit transfer ....................................................... 54 7.16.2.2 START and STOP conditions .......................... 55 7.16.2.3 System configuration ....................................... 55 7.16.2.4 Acknowledge ....................................................55 7.16.2.5 I2C-bus protocol .............................................. 56 7.16.3 Bus communication and battery backup operation ..........................................................57 7.17 Internal circuitry ............................................... 57 7.18 Safety notes .....................................................58 8 Limiting values ..................................................58 9 Static characteristics ........................................59 9.1 Current consumption characteristics, typical ....62 9.2 Frequency characteristics ................................63 10 Dynamic characteristics ...................................65 10.1 SPI-bus timing characteristics ......................... 65 10.2 I2C-bus timing characteristics ..........................66 11 Application information ....................................68 12 Package outline .................................................69 PCA2131 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Product data sheet Rev. 1.0 — 26 July 2021 85 / 86 |
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