RX-4801JE:UB Epson Toyocom Corporation, RX-4801JE:UB Datasheet
RX-4801JE:UB
Specifications of RX-4801JE:UB
Related parts for RX-4801JE:UB
RX-4801JE:UB Summary of contents
Page 1
... ETM27E-04 Application Manua Real Time Clock Module RX-4801SA/JE l ...
Page 2
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, ...
Page 3
... RX - 4801 Overview.......................................................................................................................... 1 2. Block Diagram ................................................................................................................. 1 3. Terminal description ........................................................................................................ 2 3.1. Terminal connections........................................................................................................................2 3.2. Pin Functions ....................................................................................................................................2 4. Absolute Maximum Ratings ............................................................................................. 3 5. Recommended Operating Conditions.............................................................................. 3 6. Frequency Characteristics ............................................................................................... 3 7. Electrical Characteristics ................................................................................................. 4 7.1. DC characteristics.............................................................................................................................4 7.2. AC Characteristics ............................................................................................................................5 8. Use Methods.................................................................................................................... 6 8.1. Overview of Functions ......................................................................................................................6 8.2. Description of Registers....................................................................................................................7 8 ...
Page 4
... RX - 4801 C-Bus Interface Real-time Clock Module RX - 4801 • Features built-in 32.768 kHz DTCXO, High Stability. • Serial interface in 4 lines form • Alarm interrupt function for day, date, hour, and minute settings • Fixed-cycle timer interrupt function • Time update interrupt function • ...
Page 5
... RX - 4801 Terminal description 3.1. Terminal connections RX − 4801 CLK 3. FOUT 4. N.C. 5. TEST FOE SOP − 14pin 3.2. Pin Functions Signal I/O name This is the chip enabled input pin. It has a built-in pull-down resistance. When the CE pin is at the "H" level, access to this RTC becomes possible. Also, when the ...
Page 6
... RX - 4801 Absolute Maximum Ratings Item Symbol Supply voltage V DD Input voltage V IN1 Output voltage (1) V OUT1 Output voltage (2) V OUT2 Storage temperature T STG 5. Recommended Operating Conditions Item Symbol Operating supply voltage V DD Temp. compensation V TEM voltage Clock supply voltage V CLK Operating temperature ...
Page 7
... RX - 4801 Electrical Characteristics 7.1. DC characteristics *Unless otherwise specified, GND = Item Symbol Current CE = GND, /INT = V I DD1 consumption (1) FOE = GND Current FOUT : output OFF ( High DD2 Compensation interval 2.0 s consumption (2) Current I DD3 CE = GND, /INT, FOE = V consumption (3) FOUT : 32 kHz Current Compensation interval 2.0 s ...
Page 8
... RX - 4801 7.2. AC Characteristics Item Symbol CLK clock cycle t CLK CLK H pulse width t WH CLK L pulse width t WL CLK rise and fall time t RF CLK setup time t CLKS t CE setup time hold time recovery time enable time WCE t Write data setup time ...
Page 9
... RX - 4801 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 two digits) data. Any (two-digit) year that is a multiple treated as a leap year and calculated automatically as such until the year 2099 ...
Page 10
... RX - 4801 8.2. Description of Registers 8.2.1. Register table Address Function 0 SEC 1 MIN 2 HOUR 3 WEEK 4 DAY 5 MONTH 6 YEAR 7 RAM 8 MIN Alarm 9 HOUR Alarm WEEK Alarm A DAY Alarm B Timer Counter 0 C Timer Counter 1 D Extension Register E Flag Register F Control Register Note When after the initial power-up or when the result of read out the VLF bit is "1" , initialize all registers, before using the module ...
Page 11
... RX - 4801 8.2.2. Control register (Reg F) Address Function Control Register F (Default) ∗1) The default value is the value that is read (or is set internally) after powering up from 0 V. ∗2) "o" indicates write-protected bits. A zero is always read from these bits. ∗3) "−" indicates no default value has been defined. ...
Page 12
... RX - 4801 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 generated (/INT status changes from Hi-Z to low not generated (/INT status remains Hi-Z). When a "1" is written to this bit, an interrupt signal is generated (/INT status changes from Hi-Z to low) when an interrupt event is generated. When a " ...
Page 13
... RX - 4801 8.2.3. Flag register (Reg-E) Address Function Flag register E (Default) ∗1) The default value is the value that is read (or is set internally) after powering up from 0 V. ∗2) "o" indicates write-protected bits. A zero is always read from these bits. ∗3) "−" indicates a default value is undefined. ...
Page 14
... RX - 4801 8.2.4. Extension register (Reg-D) Address Function Extension Register D (Default) ∗1) The default value is the value that is read (or is set internally) after powering up from 0 V. ∗2) "o" indicates write-protected bits. A zero is always read from these bits. ∗3) "−" indicates a default value is undefined. ...
Page 15
... RX - 4801 8.2.5. RAM register (Reg - 7) Address Function 7 RAM • This RAM register is read/write accessible for any data in the range from 8.2.6. Clock counter (Reg - Address Function 0 SEC 1 MIN 2 HOUR ∗) "o" indicates write-protected bits. A zero is always read from these bits. • The clock counter counts seconds, minutes, and hours. ...
Page 16
... RX - 4801 8.2.8. Calendar counter (Reg Address Function 4 DAY 5 MONTH 6 YEAR ∗) "o" indicates write-protected bits. A zero is always read from these bits. • The auto calendar function updates all dates, months, and years from January 1, 2001 to December 31, 2099. • The data format is BCD format. For example, a date register value of "0011 0001" indicates the 31st. ...
Page 17
... RX - 4801 8.3. Fixed-cycle Timer Interrupt Function The fixed-cycle timer interrupt generation function generates an interrupt event periodically at any fixed cycle set between 244.14 μs 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 report that an event has occurred. (However, when a fixed-cycle timer interrupt event has been generated low-level output from the /INT pin occurs only when the value of the control register's TIE bit is " ...
Page 18
... RX - 4801 8.3.2. Related registers for function of time update interrupts. Address Function B Timer Counter 0 C Timer Counter 1 D Extension Register E Flag Register F Control Register ∗1) "o" indicates write-protected bits. A zero is always read from these bits. ∗2) Bits marked with "•" are RAM bits that can contain any value and are read/write-accessible. ...
Page 19
... RX - 4801 TIE (Timer Interrupt Enable) bit When a fixed-cycle timer interrupt event occurs (when 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 not generated (/INT status remains Hi-Z). Data ...
Page 20
... RX - 4801 8.4. Time Update Interrupt Function The time update interrupt function generates interrupt events 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 an event has occurred. (However, when a fixed-cycle timer interrupt event has been generated, low-level output from the /INT pin occurs only when the value of the control register's UIE bit is " ...
Page 21
... RX - 4801 8.4.2. Related registers for time update interrupt functions. Address Function D Extension Register E Flag Register F Control Register ∗ ) "o" indicates write-protected bits. A zero is always read from these bits. ∗ Before entering settings for operations, we recommend writing a "0" to the UIE bit to prevent hardware interrupts from occurring inadvertently while entering settings. ∗ ...
Page 22
... RX - 4801 8.5. Alarm Interrupt Function The alarm interrupt generation function 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 occurred. ∗ ...
Page 23
... RX - 4801 8.5.2. Related registers Address Function 1 MIN 2 HOUR 3 WEEK 4 DAY 8 MIN Alarm 9 HOUR Alarm WEEK Alarm A DAY Alarm D Extension Register E Flag Register F Control Register ∗ 1) "o" indicates write-protected bits. A zero is always read from these bits. ∗ 2) Bits marked with "•" are RAM bits that can contain any value and are read/write-accessible. ...
Page 24
... RX - 4801 (Alarm Flag) bit When this flag bit value is already set to "0", occurrence of an alarm interrupt event changes it to "1". When this flag bit value is "1", its value is retained until a "0" is written to it. Data AF 0 Write 1 0 Read 1 4) AIE (Alarm Interrupt Enable) bit When an alarm interrupt event occurs (when the AF bit value changes from " ...
Page 25
... RX - 4801 8.6. Read/Write of data For both read and write, first set up chip condition (internally CE="H") to CE="H" , then specify the 4-bits address, and finally read or write in 8-bits units. Both read and write use MSB-first. In continuous operation, objected address is auto incremented. Auto incrementing of the address is cyclic, so address "F" is followed by address "0". ...
Page 26
... RX - 4801 8.7. V and CE timing DD * When the power is turned to ON, use with CE = " L " chart. 1 Item CE voltage when power is turned to ON CE=V [V] time when power CL is turned to ON 8.8. Backup and Recovery CLK Item Symbol Power supply detection voltage ( 1 ) Power supply V detection voltage ( 2 ) ...
Page 27
... RX - 4801 8.8. Connection with Typical Microcontroller V DD Note : It uses the secondary battery or a lithium battery. When using the seconding battery, the diode is not required. When using the lithium battery, the diode is required. For detailed value on the resistance, please consult a battery maker. ...
Page 28
... RX - 4801 External Dimensions / Marking Layout 9.1. RX − 4801 SA ( SOP − 14pin ) 9.1.1. External dimensions RX − 4801 SA ( SOP − 14pin ) • External dimensions 10.1 0.2 ± #14 #8 5.0 7 0.05 Min. 0.35 1.27 1.2 ∗ The cylinder of the crystal oscillator can be seen in this area ( front ), but it has no affect on the performance of the device ...
Page 29
... RX - 4801 9.2. RX − 4801 JE ( VSOJ − 20pin ) 9.2.1. External dimensions RX − 4801 JE ( VSOJ − 20pin ) • External dimensions 7.0 ± 0.3 #20 #11 5.4 #1 #10 1.3 1.5 Max. 0 Min. 0.22 0.65 0.12 0.1 ∗ The cylinder of the liquid crystal oscillator can be seen in this area ( back and front ), but it has no affect on the performance of the device ...
Page 30
... RX - 4801 10. Application notes 1) Notes on handling This module uses a C-MOS IC to realize low power consumption. Carefully note the following cautions when handling. (1) Static electricity While this module has built-in circuitry designed to protect it against electrostatic discharge, the chip could still be damaged by a large discharge of static electricity. Containers used for packing and transport should be constructed of conductive materials. ...
Page 31
Application Manual AMERICA EPSON ELECTRONICS AMERICA, INC. HEADQUARTER 2580 Orchard Parkway, San Jose, CA 95131, U.S.A. Phone: (1)800-228-3964 (Toll free) : (1)408-922-0200 (Main) Fax: (1)408-922-0238 http://www.eea.epson.com Atlanta Office One Crown Center 1895 Phoenix Blvd. Suite 348 Atlanta,GA 30349 Phone: (1)800-228-3964 ...