Instruction/ maintenance manual of the product RX-8581NB Epson
Go to page of 32
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.
An important point after buying a device Epson RX-8581NB (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Epson RX-8581NB yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Epson RX-8581NB - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Epson RX-8581NB you will learn all the available features of the product, as well as information on its operation. The information that you get Epson RX-8581NB will certainly help you make a decision on the purchase.
If you already are a holder of Epson RX-8581NB, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Epson RX-8581NB.
However, one of the most important roles played by the user manual is to help in solving problems with Epson RX-8581NB. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Epson RX-8581NB along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
