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MQ372-02 Application Manua l Real Time Clock Module R X -8581SA/JE/NB Model Product Number RX- 8581SA Q4185815 xxxxx00 RX- 8581JE Q4185817 xxxxx00 RX- 8581NB Q4185819 xxxxx00.
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 Seiko Epson. • The information, applied circuit, program, using w ay etc.
RX - 8581 SA / JE / NB Contents 1. Overv iew ................................................................................................................... 1 2. Block Diagram .......................................................................
RX - 8581 SA / JE / NB Page - 1 MQ372-02 I 2 C-Bus Interface Real-time Clock Module RX - 8581 SA / JE / NB • Features built-in 32.768-kHz crystal oscillator, frequency adjusted • Supports I 2 C-Bu.
RX - 8581 SA / JE / NB Page - 2 MQ372-02 3. T erminal description 3.1. T er m inal connect ions RX - 8581 SA SOP − 14 pi n # 1 # 7 # 14 # 8 No. Pin terminal No. Pin terminal 1 N.C. 14 FOUT 2 SC L 13 N.C. 3 SD A 12 N.C. 4 N.C. 1 1 V DD 5 GND 10 FOE 6 N.
RX - 8581 SA / JE / NB Page - 3 MQ372-02 4. Absolute Maximum Ratings GND = 0 V Item Symbol Condition Rating Unit Supply voltage V DD Between V DD and GND − 0.3 to +7.0 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 - 8581 SA / JE / NB Page - 4 MQ372-02 7.2. AC Characteristics * Unless otherw ise 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 - 8581 SA / JE / NB Page - 5 MQ372-02 8. Use Methods 8.1. Overview of Functions 1) Clock f unct ions This function is used to set and read out month, day , hour , date, minute, second, and year (last two digit s ) data.
RX - 8581 SA / JE / NB Page - 6 MQ372-02 8.2. Description of Reg isters 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 M.
RX - 8581 SA / JE / NB Page - 7 MQ372-02 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 ! ! UIE TI E AIE ! STOP RESET F (Default) (0).
RX - 8581 SA / JE / NB Page - 8 MQ372-02 4) STOP bit This bit is used to stop functions related to the RT C's internal counter operations. W riting a "1" to this bit stops the counter operations. W riting a "0" to this bit cancels stop status (restarts operations).
RX - 8581 SA / JE / NB Page - 9 MQ372-02 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 ! E (Default) (0) (0) ( − ) ( − ) ( − ) (0) (1) (0) ∗ 1) The default value is the val ue that is read (or is set internally) after powering up from 0 V.
RX - 8581 SA / JE / NB Page - 10 MQ372-02 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 R egister TEST WA D A USEL TE ! ! TSEL1 TSEL0 D .
RX - 8581 SA / JE / NB Page - 11 MQ372-02 8.2.6. Clock counter (Reg - 0 ∼ 2) Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 0 SEC ! 40 20 10 8 4 2 1 1 MI N ! 40 20 10 8 4 2 1 2 HOUR ! ! 20 10 8 4 2 1 ∗ ) "o" indicates write-protected bits.
RX - 8581 SA / JE / NB Page - 12 MQ372-02 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 MONT H ! ! ! 10 8 4 2 1 6 YEAR 80 40 20 10 8 4 2 1 ∗ ) "o" indicates write-protected bits.
RX - 8581 SA / JE / NB Page - 13 MQ372-02 8.3. Fixed-cycle Timer Interrupt Function The fix ed-cycle timer interrupt generation function generates an interrupt event periodically at any fix ed cycle set between 244.
RX - 8581 SA / JE / NB Page - 14 MQ372-02 8.3.2. Related registers for function of time update interrupts. Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 B Timer Counter 0 128 64 32 .
RX - 8581 SA / JE / NB Page - 15 MQ372-02 5) TIE (T imer Interrupt Enable) bit W hen a fixed-cycle timer interrupt ev ent occurs (when the T F bit value changes from "0" to "1"), t.
RX - 8581 SA / JE / NB Page - 16 MQ372-02 8.4. Time Updat e I nt errupt Funct ion 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 - 8581 SA / JE / NB Page - 17 MQ372-02 8.4.2. Related registers for time update interrupt functions. Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 D Extension R egister TEST WA D.
RX - 8581 SA / JE / NB Page - 18 MQ372-02 8.5. Alarm Int errupt Funct ion The alarm interrupt generation function generates interrupt event s for alarm settings such as date, day , hour , and minute settings.
RX - 8581 SA / JE / NB Page - 19 MQ372-02 8.5.2. Related registers Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 MI N ! 40 20 10 8 4 2 1 2 HOUR ! ! 20 10 8 4 2 1 3 W EEK ! 6 5 4 3.
RX - 8581 SA / JE / NB Page - 20 MQ372-02 3) AF (Alarm Flag) bit W hen this flag bit value is already set to "0", occurrence of an alarm interrupt event changes it to "1". W hen this flag bit value is "1", its value is retained until a "0" is w ritten to it.
RX - 8581 SA / JE / NB Page - 21 MQ372-02 8.6. Reading / W riting Data via the I 2 C Bus Inte rface 8.6.1. Overview of I 2 C-BUS The I 2 C bus supports bi-directional communications via tw o signal lines: the SDA (data) line and SCL (clock) line.
RX - 8581 SA / JE / NB Page - 22 MQ372-02 8.6.3. Starting and stopping I 2 C bus communications SCL ST ART condition SDA 0.95 s ( Max. ) Repea ted S T AR T(REST ART) condition STOP condition [ S ] [ S.
RX - 8581 SA / JE / NB Page - 23 MQ372-02 8.6.4. Data transfers and acknowledge responses during I 2 C-BUS communications 1) Data transfers Data transfers are performed in 8-bit (1 byte) units once the ST ART condition has occurred.
RX - 8581 SA / JE / NB Page - 24 MQ372-02 8.6.6. I 2 C bus protocol In the following sequence descriptions, it is assumed that the CP U is the master and the RX-8581 is the slav e.
RX - 8581 SA / JE / NB Page - 25 MQ372-02 8.7. Backup and Recovery V DD t F t R2 Back up t R1 V CLK 0 V Item Symbol Min. T yp. Max. Power supply drop time t F 2 µ s /V Initial power-up time t R1 1 µ s /V 10 ms /V Clock maintenance power-up time t R2 1 µ s /V 8.
RX - 8581 SA / JE / NB Page - 26 MQ372-02 9. External Dimensions / Marking Layout RX-8581 SA (SOP - 14 pin) • Ex ternal dimensions • Recommended soldering 0.6 0.15 0 ° - 10 ° 1.4 1.4 5.4 1.27 1.27 × 6 = 7.62 0.7 Unit : m m 10.1 ± 0.2 5.0 7.4 ± 0.
RX - 8581 SA / JE / NB Page - 27 MQ372-02 10. Reference Data [Finding the frequency stability] 1. Frequency and temperature characteristics can be approximated using the follow ing equations. ∆ f T = α ( θ T - θ X ) 2 ∆ f T : Frequency deviation in any temperature α (1 / ° C 2 ) : Coefficient of secondary temperature ( − 0.
RX - 8581 SA / JE / NB Page - 28 MQ372-02 1 1. Application notes 11.1. Notes on handling This module uses a C -MO S IC to realize low power consumption.
Application Manual AME RIC A EPSON ELECTRONICS AMERICA, INC. HEA DQUA RTER 150 River Oaks P arkway , San Jose, CA 95134, U. S.A . Phone: (1)800-228-3964 (T oll free) : (1)408-922-0200 (M ain) Fax: (1)408-922-0238 htt p://www. eea.epson.com A tl anta Office 3010 Royal Blvd.
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