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Manual Epson RX-8801SA/JE

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  • Epson RX-8801SA/JE - page 1

    ETM26E-03 Application Manua l Real Time Clock Module RX-8801SA / JE ...

  • Epson RX-8801SA/JE - page 2

    N O T I C E • The material is subject to change without notice. • Any part of this material may not be reproduced or duplicated in any form or any means without the written permission of Epson Toyocom. • The information, applied circuit, program , usage et c., written in this material is just for reference. Epson Toyocom does not assume any l ...

  • Epson RX-8801SA/JE - page 3

    RX - 8801 SA / JE Contents 1. Overview .................................................................................................................... ...... 1 2. Block Diagram ................................................................................................................. 1 3. Terminal description ............................ ...

  • Epson RX-8801SA/JE - page 4

    RX − 8801 SA / JE Page - 1 ETM26E-03 I 2 C-Bus Interface Real-time Clock Module RX − 8801 SA / JE • Features built-in 32.768 kHz DTCXO, High Stability. • Supports I 2 C-Bus's high speed mode (400 kHz) • Alarm interrupt function for day, date, hour, and minute settings • Fixed-cycle timer interrupt function • Time update interrupt ...

  • Epson RX-8801SA/JE - page 5

    RX − 8801 SA / JE Page - 2 ETM26E-03 3. T erminal description 3.1. Terminal connections RX − 88 01 SA 1 . T 1 ( C E ) 1 4. N . C . 2 . SCL 1 3. SDA 3 . FOU T 12 . T2 ( V PP ) 4 . N. C. 1 1. GND 5 . TE ST 10. / I N T 6 . V DD 9. N. C. 7 . FOE 8. N.C. SO P − 14pin RX − 88 0 1 JE 1 . /IN T 2 0 . N. C . 2. G N D 19. N. C. 3. T 2 (V PP ) 18. N. ...

  • Epson RX-8801SA/JE - page 6

    RX − 8801 SA / JE Page - 3 ETM26E-03 4. Absolute Maximum Ratings GND = 0 V Item Symbol Condition Rating Unit Supply voltage V DD Between V DD and GND − 0.3 to +6.5 V Input voltage (1) V IN1 FOE pin GND − 0.3 to V DD +0.3 V Input voltage (2) V IN2 SCL and SDA pins GND − 0.3 to +6.5 V Output voltage (1) V OUT1 FOUT pin GND − 0.3 to V DD +0. ...

  • Epson RX-8801SA/JE - page 7

    RX − 8801 SA / JE Page - 4 ETM26E-03 7. Electrical Characteristics 7.1. DC Characteristics *Unless otherwise specified, GND = 0 V, V DD = 1.6 V to 5.5 V, Ta = − 40 ° C to +85 ° C Item Symbol Condition Min. Typ. Max. Unit Current consumption (1) I DD1 V DD = 5 V 1.2 3.4 Current consumption (2) I DD2 f SCL = 0 Hz, / INT = V DD FOE = GND FOUT : ...

  • Epson RX-8801SA/JE - page 8

    RX − 8801 SA / JE Page - 5 ETM26E-03 7.2. AC Characteristics * Unless otherwise specified, GND = 0 V , V DD = 1.8 V to 5.5 V , Ta = − 40 ° C to +85 ° C Item Symbol Condition Min. Typ. Max. Unit SCL clock frequency f SCL 400 kHz Start condition setup time t SU;STA 0.6 μ s Start condition hold time t HD;STA 0.6 μ s Data setup time t SU;DAT 10 ...

  • Epson RX-8801SA/JE - page 9

    RX − 8801 SA / JE Page - 6 ETM26E-03 8. Use Methods 8.1. Overview of Functions 1) Clock functions This function is used to set and read out month, day , hour , date, minute, second, and year (last tw o digits) data. Any (tw o-digit) year that is a multiple of 4 is treated as a leap year and calcul ated automatically as such until the year 2099. 2 ...

  • Epson RX-8801SA/JE - page 10

    RX − 8801 SA / JE Page - 7 ETM26E-03 8.2. Description of Registers 8.2.1. Register table Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 Remark 0 SEC { 40 20 10 8 4 2 1 ∗ 3 1 MIN { 40 20 10 8 4 2 1 ∗ 3 2 HOUR { { 20 10 8 4 2 1 ∗ 3 3 WEEK { 6 5 4 3 2 1 0 ∗ 3 4 DAY { { 20 10 8 4 2 1 ∗ 3 5 MONT H { { { 10 8 4 2 1 ∗ 3 6 Y ...

  • Epson RX-8801SA/JE - page 11

    RX − 8801 SA / JE Page - 8 ETM26E-03 8.2.2. Control register (Reg F) Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 Control Register CSEL1 CSEL0 UIE TIE AIE { { RESET F (Default) (0) (1) ( − ) ( − ) ( − ) (0) (0) ( − ) ∗ 1) The default value is the value that is read (or is set internally ) after powering up from 0 V. ...

  • Epson RX-8801SA/JE - page 12

    RX − 8801 SA / JE Page - 9 ETM26E-03 3) AIE ( Alarm Interrupt Enable ) bit When an alarm timer interrupt event occurs (when the AF bit value changes from "0" to "1"), this bit's value specifies if an interrupt signal is gener ated (/INT status changes from Hi-Z to low) or is not generated (/INT status remains Hi-Z). When ...

  • Epson RX-8801SA/JE - page 13

    RX − 8801 SA / JE Page - 10 ETM26E-03 8.2.3. Flag register (Reg-E) Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 Flag register { { UF TF AF { VLF VDET E (Default) (0) (0) ( − ) ( − ) ( − ) (0) (1) (1) ∗ 1) The default value is the value that is read (or is set internally ) after powering up from 0 V. ∗ 2) "o" ...

  • Epson RX-8801SA/JE - page 14

    RX − 8801 SA / JE Page - 11 ETM26E-03 8.2.4. Extension register (Reg-D) Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 Extension Register TEST WADA USEL TE FSEL1 FSEL0 TSEL1 TSEL0 D (Default) (0) ( − ) ( − ) ( − ) (0) (0) ( − ) ( − ) ∗ 1) The default value is the value that is read (or is set internally ) after power ...

  • Epson RX-8801SA/JE - page 15

    RX − 8801 SA / JE Page - 12 ETM26E-03 8.2.5. RAM register (Reg - 7) Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 7 RAM • • • • • • • • • This RAM register is read/write acce ssible for any data in the range from 00 h to FF h. 8.2.6. Clock counter (Reg - 0 ∼ 2) Address Function bit 7 bit 6 bit 5 bit 4 bit 3 ...

  • Epson RX-8801SA/JE - page 16

    RX − 8801 SA / JE Page - 13 ETM26E-03 8.2.8. Calendar counter (Reg 4 to 6) Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 4 DAY { { 20 10 8 4 2 1 5 MONTH { { { 10 8 4 2 1 6 YEAR 80 40 20 10 8 4 2 1 ∗ ) "o" indicates write-protected bits. A ze ro is alw ays read from these bits. • The auto calendar function updates ...

  • Epson RX-8801SA/JE - page 17

    RX − 8801 SA / JE Page - 14 ETM26E-03 8.3. Fixed-cycle Timer Interrupt Function The fixed-cycle timer interrupt generation function generates an inte rrupt event periodically at any fixed cycle set between 244.14 μ s and 4095 minutes. When an interrupt event is generated, the /INT pin goes to low level and "1" is set to the TF bit to r ...

  • Epson RX-8801SA/JE - page 18

    RX − 8801 SA / JE Page - 15 ETM26E-03 8.3.2. Related registers for f unction of time update interrupts. Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 B T imer Counter 0 128 64 32 16 8 4 2 1 C Timer Counter 1 • • • • 2048 1024 512 256 D Extension Register TEST WADA USEL TE FSEL1 FSEL0 TSEL1 TSEL0 E Flag Register { { UF T ...

  • Epson RX-8801SA/JE - page 19

    RX − 8801 SA / JE Page - 16 ETM26E-03 5) TIE (T imer Interrupt Enable) bit When a fixed-cycle timer interrupt event occurs (w hen the TF bit value changes from "0" to "1"), this bit's value specifies whether an interrupt signal is generated (/INT status changes from Hi- Z to low ) or is not generated (/INT status remains ...

  • Epson RX-8801SA/JE - page 20

    RX − 8801 SA / JE Page - 17 ETM26E-03 8.4. Time Update Interrupt Function The time update interrupt function generates interrupt event s at one-second or one-minute intervals, according to the timing of the internal clock. When an interrupt event occurs, the UF bit value becomes "1 " and the /INT pin goes to low level to indicate that a ...

  • Epson RX-8801SA/JE - page 21

    RX − 8801 SA / JE Page - 18 ETM26E-03 8.4.2. Related registers f or time update interrupt functions. Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 D Extension Register TEST WADA USEL TE FSEL1 FSEL0 TSEL1 TSEL0 E Flag Register { { UF TF AF { VLF VDET F Control Register CSEL1 CSEL0 UIE TIE AIE { { RESET ∗ ) "o" indica ...

  • Epson RX-8801SA/JE - page 22

    RX − 8801 SA / JE Page - 19 ETM26E-03 8.5. Alarm Interrupt Function The alarm interrupt generation f unction generates interrupt events for alarm settings such as date, day , hour , and minute settings. When an interrupt event occurs, the AF bit value is set to "1" and the / INT pin goes to low level to indicate that an event has occurr ...

  • Epson RX-8801SA/JE - page 23

    RX − 8801 SA / JE Page - 20 ETM26E-03 8.5.2. Related registers Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 MIN { 40 20 10 8 4 2 1 2 HOUR { { 20 10 8 4 2 1 3 WEEK { 6 5 4 3 2 1 0 4 DAY { { 20 10 8 4 2 1 8 MIN Alarm AE 40 20 10 8 4 2 1 9 HOUR Alarm AE • 20 10 8 4 2 1 WEEK Alarm 6 5 4 3 2 1 0 A DAY Alarm AE • 20 10 8 4 2 1 ...

  • Epson RX-8801SA/JE - page 24

    RX − 8801 SA / JE Page - 21 ETM26E-03 3) AF (Alarm Flag) bit When this flag bit value is already set to "0", occurrence of an alarm int errupt event changes it to "1". When this flag bit value is "1", its value is retained unt il a "0" is w ritten to it. AF Data Description 0 The AF bit is cleared to zero t ...

  • Epson RX-8801SA/JE - page 25

    RX − 8801 SA / JE Page - 22 ETM26E-03 8.6. Reading/Writing Data via the I 2 C Bus Interface 8.6.1. Overview of I 2 C-BUS The I 2 C bus supports bi-direct ional communications via tw o signal lines: the SDA (data) line and SCL (clock) line. A combination of these two signals is used to transmit and receive communication st art/stop signals, data t ...

  • Epson RX-8801SA/JE - page 26

    RX − 8801 SA / JE Page - 23 ETM26E-03 8.6.3. Starti ng and stopping I 2 C bus communications SCL ST ART condit ion SDA 0.95 s ( Max. ) Repeated ST AR T(REST ART) condit ion STOP condition [ S ] [ Sr ] [ P ] 1) START conditi on, repeated START condition, and STOP condit ion (1) START condition • The SDA level changes from high to low while SCL i ...

  • Epson RX-8801SA/JE - page 27

    RX − 8801 SA / JE Page - 24 ETM26E-03 8.6.4. Data tr ansfers and acknow ledge responses during I 2 C-BUS communications 1) Data tra nsfers Data transfers are performed in 8-bit (1 byte) units once t he START condition has occurred. There is no limit on the amount (bytes) of data that are t ransferr ed betw een the START condit ion and STOP condit ...

  • Epson RX-8801SA/JE - page 28

    RX − 8801 SA / JE Page - 25 ETM26E-03 8.6.6. I 2 C bus prot ocol In the following sequence descriptions, it is assumed that t he CPU is the master and the RX-8801 is the slave. a. Address specification write sequence Since the RX-8801 includes an address auto increment funct ion, once the initial address has been specified, the RX-8801 increments ...

  • Epson RX-8801SA/JE - page 29

    RX − 8801 SA / JE Page - 26 ETM26E-03 8.7. Backup and Recovery V DD t F t R2 Back up t R1 V CLK 0 V V DET Item Symbol Condition Min. Typ. Max. Unit. Power supply detection voltage ( 1 ) V DET − 2.2 V Power supply detection voltage ( 2 ) V LOW − 1.6 V Power supply drop time t F − 2 μ s /V Initial power-up time t R1 − 10 ms /V 1.6V → V D ...

  • Epson RX-8801SA/JE - page 30

    RX − 8801 SA / JE Page - 27 ETM26E-03 8.8. Connection with Typical Microcontroller Mas ter V DD SCL SDA t r R = C BU S Pull up Registor RX-8801 SCL SDA GND V DD I C-BUS 2 ( I 2 C Bu s ) V DD D1: Schott k y Barri er D i o d e Note SDA SCL SLAVE ADRS = 01 10 010 * Note : It uses the secondary battery or a lithium battery . When using the seconding ...

  • Epson RX-8801SA/JE - page 31

    RX − 8801 SA / JE Page - 28 ETM26E-03 9. External Dimensions / Marking Layout 9.1. RX − 8801 SA ( SOP − 14pin ) 9.1.1. External dimensions RX − 8801 SA ( SOP − 14pin ) • E x t e r n a l d i m e n s i o n s • Recommended soldering pattern 0.6 0.15 0 ° - 1 0 ° 1.4 1.4 5.4 1.27 1.27 × 6 = 7.62 0.7 Un it : mm 10.1 ± 0. 2 5.0 7.4 ± 0. ...

  • Epson RX-8801SA/JE - page 32

    RX − 8801 SA / JE Page - 29 ETM26E-03 9.2. RX − 8801 JE ( VSOJ − 20pin ) 9.2.1. External dimensions RX − 8801 JE ( VSOJ − 20pin ) • E x t e r n a l d i m e n s i o n s • Recommended soldering pattern 0.65 0.22 1.3 1.5 Max . 0.12 0.1 0 Min. 6.0 ± 0.2 (0.75) (0.75) Unit : mm 1.5 3.8 1.5 0.65 × 9 = 5.85 0.3 0.35 0.65 5.4 7.0 ± 0.3 #1 ...

  • Epson RX-8801SA/JE - page 33

    RX − 8801 SA / JE Page - 30 ETM26E-03 10. Application notes 1) Notes on handling This module us es a C-MOS IC to realize low power consumption. Caref ully note the following c autions when handling. (1) S tati c electr ici ty While t his mod ule h as b uilt-i n circ uitry de signed t o pr otect it ag ainst e lec tros tati c di scharge , the chip ...

  • Epson RX-8801SA/JE - page 34

    A p plicatio n Man u al Elect r oni c devices i nform at i on on WWW s erver AMERI CA EPSON EL ECTRO NIC S AM ER ICA, IN C. HEADQUARTER 2580 O rch ard P arkway , S an Jose, C A 95131, U . S . A . Phone : (1 ) 800-228- 3964 ( T o ll free) : ( 1) 408- 922-0200 ( M ai n) F ax: ( 1)408- 922- 0238 h tt p : / / www. eea. epso n .co m A tl an t a O f fi c ...

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