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Epson RX-8801SA/JE 3. Terminal description, RX − 8801 SA, RX − 8801 JE, I/O, name, Page, Signal, Function, ETM26E-03, 3.2. Pin Functions, 3.1. Terminal connections

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RX − 8801 SA / JE

3. Terminal description

3.1. Terminal connections

			RX − 8801 SA															RX − 8801 JE
1.	T1 (CE)												14.	N.C.	1.	/INT								20.	N.C.
2.	SCL												13.	SDA	2.	GND	# 1						# 20	19. N.C.
															3.	T2 (VPP)								18.	N.C.


3.	FOUT												12.	T2 (VPP)	4.	SDA								17.	N.C.
4.	N.C.												11.	GND	5.	N.C.								16.	N.C.
4.	N.C.												11.	GND	6.	T1 (CE)								15.	N.C.
5.	TEST												10.	/ INT	6.	T1 (CE)								15.	N.C.
															7.	SCL								14.	N.C.
															7.	SCL								14.	N.C.
6.	VDD												9.	N.C.	8.	FOUT	# 10						# 11	13.	N.C.
															8.	FOUT								13.	N.C.
															9.	N.C.								12.	N.C.
7.	FOE												8.	N.C.

															10.	FOE			VSOJ − 20pin					11.	VDD



					SOP − 14pin

3.2. Pin Functions

	Signal	I/O	Function
	name	I/O	Function
	name

	SCL	Input	This is the serial clock input pin for I2C Bus communications.

			This pin's signal is used for input and output of address, data, and ACK bits, synchronized
	SDA	I/O	with the serial clock used for I2C communications.
	SDA	I/O	Since the SDA pin is an N-ch open drain pin during output, be sure to connect a suitable

			pull-up resistance relative to the signal line capacity.

	FOUT	Output	This is the C-MOS output pin with output control provided via the FOE pin.
	FOUT	Output	When FOE = "H" (high level), this pin outputs a 32.768 kHz signal.
			When output is stopped, the FOUT pin = "Hi-Z"( high impedance ).

			This is an input pin used to control the output mode of the FOUT pin.
	FOE	Input	When this pin's level is high, the FOUT pin is in output mode. When it is low, output via the
			FOUT pin is stopped.

	/ INT	Output	This pins is used to output alarm signals, timer signals, time update signals, and other
	/ INT	Output	signals. This pin is an open drain pin.
			signals. This pin is an open drain pin.

	TEST	Input	* Use by the manufacture for testing. ( Do not connect externally.)

	T1 (CE)	Input	* Use by the manufacture for testing. ( Do not connect externally.)

	T2 (VPP)	−	* Use by the manufacture for testing. ( Do not connect externally.)

	VDD	−	This pin is connected to a positive power supply.

	GND	−	This pin is connected to a ground.

	N.C.	−	This pin is not connected to the internal IC.
	N.C.	−	Leave N.C. pins open or connect them to GND or VDD.
			Leave N.C. pins open or connect them to GND or VDD.

Note: Be sure to connect a bypass capacitor rated at least 0.1 μF between VDD and GND.

Page - 2

ETM26E-03

Contents

Page NOTICE RX - 8801 SA / JE Contents 2. Block Diagram 3. Terminal description 4. Absolute Maximum Ratings I2C-BusInterface Real-timeClock Module 1. Overview 2. Block Diagram 3. Terminal description RX − 8801 SA RX − 8801 JE 4. Absolute Maximum Ratings Item Symbol Condition Rating 7. Electrical Characteristics •Temperature compensation and consumption current Protocol SCL SDA 8. Use Methods 8.2. Description of Registers 8.2.1. Register table Address Remark SEC MIN 8.2.2. Control register (Reg F) Control Register CSEL1 1) CSEL0,1 ( Compensation interval Select 0, 1 ) bits CSEL0,1 3) AIE ( Alarm Interrupt Enable ) bit When an alarm interrupt event occurs, an interrupt signal is not generated or is canceled (/INT status changes from low to Hi-Z) When an alarm interrupt event occurs, an interrupt signal is generated (/INT status changes from Hi-Zto low) Flag register 1)UF ( Update Flag ) bit 2)TF ( Timer Flag ) bit 3)AF ( Alarm Flag ) bit 4)VLF ( Voltage Low Flag ) bit Extension Register USEL TSEL1 1)TEST bit This is the manufacturer's test bit. Its value should always be "0 8.2.6. Clock counter (Reg - 0 ∼ 2) •The clock counter counts seconds, minutes, and hours The data format is BCD format 1) Second counter 00 seconds Month Date update pattern 1, 3, 5, 7, 8, 10, or 4, 6, 9, or February in normal year 8.3. Fixed-cycleTimer Interrupt Function 8.3.1. Diagram of fixed-cycletimer interrupt function TE bit TIE bit /INT output TSEL1 TSEL0 Flag Register When the 1) TSEL0,1 bits (Timer Select 0, 1) SCL pin SDA pin /INT pin 8.4. Time Update Interrupt Function ∗When the RESET bit value is "1" time update interrupt events do not occur 1) USEL (Update Interrupt Select) bit Selects "second update" (once per second) as the timing for generation of interrupt events Selects "minute update" (once per minute) as the timing for generation of 8.5. Alarm Interrupt Function ∗When the RESET bit value is "1" alarm interrupt events do not occur 1) WADA (Week Alarm /Day Alarm) bit WADA Sets WEEK as target of alarm function (DAY setting is ignored) 3) AF (Alarm Flag) bit The AF bit is cleared to zero to prepare for the next status detection Alarm interrupt events are not detected Alarm interrupt events are detected 4) AIE (Alarm Interrupt Enable) bit 8.6. Reading/Writing Data via the I2C Bus Interface 0.95 s ( Max. ) 1) START condition, repeated START condition, and STOP condition (1)START condition The SDA level changes from high to low while SCL is at high level (2)STOP condition However, the transfer time must be no longer than 0.95 seconds After address Fh, incrementation goes to address 0h [0110 65 h 64 h Page Unit I2C-BUS Master RX-8801 9. External Dimensions / Marking Layout 9.1. RX − 8801 SA ( SOP − 14pin ) ( SOP 14pin ) 9.1.1. External dimensions 9.2.RX − 8801 JE ( VSOJ − 20pin ) 9.2.1. External dimensions RX − 8801 JE ( VSOJ − 20pin ) • External dimensions • Recommended soldering pattern 10.Application notes 1)Notes on handling 2) Notes on packaging AMERICA EUROPE Distributor Electronic devices information on WWW server http://www.epsontoyocom.co.jp