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ETM26E-03 Application Manua l Real Time Clock Module RX-8801SA / JE.
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.
RX - 8801 SA / JE Contents 1. Overview .................................................................................................................... ...... 1 2. Block Diagram .....................................................................
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.
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.
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.
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.
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.
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.
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 .
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.
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).
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.
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 .
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.
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.
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.
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 .
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 .
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.
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 U.
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.
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.
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.
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.
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.
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.
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.
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.
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 .
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.
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.
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.
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.
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