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PCF2127T/2Y Datasheet(PDF) 99 Page - NXP Semiconductors |
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PCF2127T/2Y Datasheet(HTML) 99 Page - NXP Semiconductors |
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99 / 100 page  PCF2127 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 8 — 19 December 2014 99 of 100 continued >> NXP Semiconductors PCF2127 Accurate RTC with integrated quartz crystal for industrial applications 28. Contents 1 General description . . . . . . . . . . . . . . . . . . . . . . 1 2 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 4.1 Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2 5 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 6 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7 Pinning information . . . . . . . . . . . . . . . . . . . . . . 4 7.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5 8 Functional description . . . . . . . . . . . . . . . . . . . 6 8.1 Register overview . . . . . . . . . . . . . . . . . . . . . . . 6 8.2 Control registers . . . . . . . . . . . . . . . . . . . . . . . 10 8.2.1 Register Control_1 . . . . . . . . . . . . . . . . . . . . . 10 8.2.2 Register Control_2 . . . . . . . . . . . . . . . . . . . . . 11 8.2.3 Register Control_3 . . . . . . . . . . . . . . . . . . . . . 12 8.3 Register CLKOUT_ctl . . . . . . . . . . . . . . . . . . . 12 8.3.1 Temperature compensated crystal oscillator . 13 8.3.1.1 Temperature measurement . . . . . . . . . . . . . . 13 8.3.2 OTP refresh . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.3.3 Clock output . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.4 Register Aging_offset . . . . . . . . . . . . . . . . . . . 14 8.4.1 Crystal aging correction . . . . . . . . . . . . . . . . . 14 8.5 General purpose 512 bytes static RAM . . . . . 15 8.5.1 Register RAM_addr_MSB . . . . . . . . . . . . . . . 16 8.5.2 Register RAM_addr_LSB . . . . . . . . . . . . . . . . 16 8.5.3 Register RAM_wrt_cmd . . . . . . . . . . . . . . . . . 16 8.5.4 Register RAM_rd_cmd . . . . . . . . . . . . . . . . . . 16 8.5.5 Operation examples . . . . . . . . . . . . . . . . . . . . 17 8.5.5.1 Writing to the RAM . . . . . . . . . . . . . . . . . . . . . 17 8.5.5.2 Reading from the RAM . . . . . . . . . . . . . . . . . . 17 8.6 Power management functions . . . . . . . . . . . . 17 8.6.1 Battery switch-over function . . . . . . . . . . . . . . 19 8.6.1.1 Standard mode . . . . . . . . . . . . . . . . . . . . . . . . 20 8.6.1.2 Direct switching mode . . . . . . . . . . . . . . . . . . 21 8.6.1.3 Battery switch-over disabled: only one power supply (VDD) . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8.6.1.4 Battery switch-over architecture . . . . . . . . . . . 22 8.6.2 Battery low detection function. . . . . . . . . . . . . 22 8.6.3 Extra power fail detection function . . . . . . . . . 23 8.6.3.1 Extra power fail detection when the battery switch-over function is enabled . . . . . . . . . . . 24 8.6.3.2 Extra power fail detection when the battery switch-over function is disabled . . . . . . . . . . . 26 8.6.4 Battery backup supply . . . . . . . . . . . . . . . . . . 26 8.7 Oscillator stop detection function . . . . . . . . . . 27 8.8 Reset function . . . . . . . . . . . . . . . . . . . . . . . . 28 8.8.1 Power-On Reset (POR) . . . . . . . . . . . . . . . . . 28 8.8.2 Power-On Reset Override (PORO) . . . . . . . . 29 8.9 Time and date function. . . . . . . . . . . . . . . . . . 30 8.9.1 Register Seconds. . . . . . . . . . . . . . . . . . . . . . 30 8.9.2 Register Minutes . . . . . . . . . . . . . . . . . . . . . . 31 8.9.3 Register Hours . . . . . . . . . . . . . . . . . . . . . . . . 32 8.9.4 Register Days . . . . . . . . . . . . . . . . . . . . . . . . 32 8.9.5 Register Weekdays . . . . . . . . . . . . . . . . . . . . 33 8.9.6 Register Months. . . . . . . . . . . . . . . . . . . . . . . 34 8.9.7 Register Years . . . . . . . . . . . . . . . . . . . . . . . . 35 8.9.8 Setting and reading the time . . . . . . . . . . . . . 35 8.10 Alarm function . . . . . . . . . . . . . . . . . . . . . . . . 37 8.10.1 Register Second_alarm . . . . . . . . . . . . . . . . . 38 8.10.2 Register Minute_alarm . . . . . . . . . . . . . . . . . . 38 8.10.3 Register Hour_alarm . . . . . . . . . . . . . . . . . . . 39 8.10.4 Register Day_alarm . . . . . . . . . . . . . . . . . . . . 39 8.10.5 Register Weekday_alarm. . . . . . . . . . . . . . . . 40 8.10.6 Alarm flag. . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 8.11 Timer functions. . . . . . . . . . . . . . . . . . . . . . . . 40 8.11.1 Register Watchdg_tim_ctl . . . . . . . . . . . . . . . 41 8.11.2 Register Watchdg_tim_val . . . . . . . . . . . . . . . 42 8.11.3 Watchdog timer function . . . . . . . . . . . . . . . . 42 8.11.4 Countdown timer function . . . . . . . . . . . . . . . 44 8.11.5 Pre-defined timers: second and minute interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 8.11.6 Clearing flags . . . . . . . . . . . . . . . . . . . . . . . . . 46 8.12 Timestamp function . . . . . . . . . . . . . . . . . . . . 48 8.12.1 Timestamp flag. . . . . . . . . . . . . . . . . . . . . . . . 48 8.12.2 Timestamp mode . . . . . . . . . . . . . . . . . . . . . . 49 8.12.3 Timestamp registers. . . . . . . . . . . . . . . . . . . . 50 8.12.3.1 Register Timestp_ctl . . . . . . . . . . . . . . . . . . . 50 8.12.3.2 Register Sec_timestp. . . . . . . . . . . . . . . . . . . 50 8.12.3.3 Register Min_timestp . . . . . . . . . . . . . . . . . . . 51 8.12.3.4 Register Hour_timestp . . . . . . . . . . . . . . . . . . 51 8.12.3.5 Register Day_timestp. . . . . . . . . . . . . . . . . . . 52 8.12.3.6 Register Mon_timestp . . . . . . . . . . . . . . . . . . 52 8.12.3.7 Register Year_timestp . . . . . . . . . . . . . . . . . . 52 8.12.4 Dependency between Battery switch-over and timestamp . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 8.13 Interrupt output, INT. . . . . . . . . . . . . . . . . . . . 54 8.13.1 Minute and second interrupts. . . . . . . . . . . . . 55 8.13.2 Countdown timer interrupts . . . . . . . . . . . . . . 56 8.13.3 INT pulse shortening . . . . . . . . . . . . . . . . . . . 56 8.13.4 Watchdog timer interrupts . . . . . . . . . . . . . . . 58 8.13.5 Alarm interrupts . . . . . . . . . . . . . . . . . . . . . . . 58 8.13.6 Timestamp interrupts . . . . . . . . . . . . . . . . . . . 58 8.13.7 Battery switch-over interrupts . . . . . . . . . . . . 58 |
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