RX-8025SA

Real time clock module High-Stability I2C-Bus INTERFACE REAL TIME CLOCK MODULE RX - 8025 SA / NB • Built-in 32.768 kHz quartz oscillator : Frequency adjusted for high accuracy (± 5 ×10−6 / Ta = +25 °C) • Interface Type : I2C-Bus Interface (400 kHz) • Operating voltage range : 1.70 V to 5.5 V • Wide Timekeeper voltage range : 1.15 V to 5.5 V • Various detection Functions : Ex. Oscillation stop detection function • Low backup current : 0.48 µA / 3 V (Typ.) Actual size • 32.768 kHz frequency output function : C-MOS output With Control Pin RX-8025SA • The various functions include full calendar, alarm, timer. • Lead(Pb)-free : Contains high melting temperature type solder (Pb85 %) exempted by RoHS directive. * The I2C-Bus is a trademark of Philips Electronics N.V. RX-8025NB Block diagram Alarm_W Register ( Min,Hour,Week ) Overview • Features built-in 32.768 kHz quartz oscillator • Frequency adjusted for high accuracy. ( ± 5 ×10−6 / Ta = +25 °C ) ( Equivalent to 13 seconds of monthly deviation ) FOUT FOE 32 kHz Output Control Comparator_W Voltage Detect VDD Comparator_D Alarm_D Register ( Min,Hour ) • The various detection function • Power supply voltage monitoring function (with selectable detection threshold ) • Stop detection function • Power-on reset detection function OSC Divider Correc -tion Div. Time Counter ( Sec,Min,Hour,Week,Day,Month,Year ) OSC Detect / INTA / INTB Address Decoder Address Register I/O Control • Alarm function and Timer function SCL SDA • Timer function produces a periodic interruption signal. As for the Alarm function an optional combination is produced. (Date of the week , time , minute) Interrupt Control Shift Register GND Pin Function Signal Name SCL SDA FOUT Input / output Function 1. 2. 3. 4. 5. 6. 7. Terminal connection / External dimensions RX − 8025 SA 1.27 (Unit:mm) RX − 8025 NB 0.5 Input Serial clock input pin Bi-directional Data input and output pin Output FOUT pin is 32.768 kHz clock output pin (C-MOS) that output control is possible. FOE input L H /CLEN1 bit X 0 0 1 1 /CLEN2 bit X 0 1 0 1 FOUT output OFF ( LOW ) 32.768 kHz 32.768 kHz 32.768 kHz OFF(LOW) N.C. SCL FOUT N.C. 14. 10.1 ± 0.2 N.C. SDA / INTB GND / INTA N.C. N.C. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. FOE VDD (GND) TEST FOUT SCL SDA / INTB GND / INTA N.C. 5.0 ± 0.2 22. 21. 6.3 Max. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. − − 13. 12. 11. 20. 19. 18. 17. FOE / INTA / INTB TEST VDD GND Input Output Output - 5.0 TEST 3.2 ± 0.1 10. 9. 8. 4.8 16. 1.3 ± 0.1 15. 14. 13. 12. Interrupt output A pin ( N-ch open drain ) Interrupt output B pin ( N-ch open drain ) ∗ Used by the manufacture for testing. (Do not connect externally.) Connected to a positive power supply. Connected to a ground. VDD FOE 7.4 ± 0.2 SOP − 14 pin SON − 22 pin Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec. Specifications (characteristics) . ∗ Refer to application manual for details. DC characteristics Ta = −40 °C to +85 °C Recommended Operating Conditions Item Power voltage Clock voltage Operating temperature Symbol VDD VCLK TOPR Condition Min. 1.7 1.15 −40 Typ. 3.0 3.0 +25 Max. 5.5 5.5 +85 Unit V V °C Item Symbol IBK Condition Min. VDD =5V VDD =3V Typ. 0.60 0.48 Max. 1.80 Unit µA fSCL = 0Hz Frequency characteristics Item Frequency tolerance Oscillation start-up time Frequency voltage characteristics ∗1) ∗2) Curent Consumption Condition Range AA: 5 ± 5 AC: 0 ± 5 1 Max. ± 1 Max. ∗1) ∗2) Symbol ∆f/f Unit × 10−6 s × 10 −6 I32k tSTA f/V Ta = +25 °C VDD = 3.0 V Ta = +25 °C VDD = 2.0 V Ta = +25 °C VDD = 2.0 V to 5.5 V FOE = GND FOUT ; output OFF(LOW) fSCL = 0Hz VDD VDD, FOE = 5.5 V = 5.5 V FOUT ; output ON ( Output=OPEN; CL = 0 pF ) 1.20 3.0 6.5 µA Power supply detection voltage Item High-voltage mode Low-voltage mode Symbol VDETH VDETL Condition VDD pin VDD pin Min. 1.90 1.15 Ta = −30 °C to +70 °C Typ. 2.10 1.30 Max. 2.30 1.45 Unit V V Equivalent to 13 seconds of monthly deviation (excluding offset). 116 http://www.epsontoyocom.co.jp