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Serial RTC with Alarm and Timer
RTC - 4573
· Built-in frequency adjusted 32.768KHz crystal oscillator
· Serial interface that can be controlled through three signal lines
· Week , Day , hour , and minute alarm interrupt functions
· Interval timer interrupt function that can be set with an interval ranging from 1/4096th of a second to 255minutes
· Dual dedicated interrupt outputs for software maskable alarms and for timers
· Functions that detect halting of crystal oscillation, and when the time is being updated
· Automatic leap year compensation function
· Wide interface voltage range, from 1.6 to 5.5V
· Wide timing voltage range, from 1.6 to 5.5V
· Low current consumption : 0.5 m A/3V (typ.)
· Small SOP package suited for high-density mounting
n n n n Overview
This module is a serial interface-type real-time clock with a crystal oscillator on chip. This module includes clock
and calendar circuitry (from seconds to years) with automatic leap year compensation, alarms, and timer interrupt
functions, as well as functions that detect when oscillation is halted, the time is being updated. The serial
interface permits control through three signal lines, keeping the number of ports required on the system side to a
minimum. Because the small SOP package can be used in high-density mounting, this module is ideal for
portable telephones, hand-held terminals, and other compact electronic equipment.
n n n n
B lock Diagram
FOUT
/ TIRQ
/ AIRQ
DATA
CLK
C E1
C E0
32.768KHz
DIVIDER
OSC
OUTPUT
CONTROLLER
INTERRUPTS
CONTROLLER
BUS
INTERFACE
CIRCUIT
CONTROL LINE
CLOCK and
CALENDAR
TIMER
REGISTER
ALARM
REGISTER
CONTROL
REGISTER
SHIFT REGISTER
Page-1
Aug. 1998
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Summary of Contents for Epson RTC-4573
- Page 1 Serial RTC with Alarm and Timer RTC - 4573 · Built-in frequency adjusted 32.768KHz crystal oscillator · Serial interface that can be controlled through three signal lines · Week , Day , hour , and minute alarm interrupt functions · Interval timer interrupt function that can be set with an interval ranging from 1/4096th of a second to 255minutes ·...
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Page 2: Pin Connection
n n n n Pin Connection FOUT DATA / AIRQ / TIRQ Symbol Pin-No. I / O Function Chip enable 1 input pin. This terminal has pull-down resistor built-in. Access to this RTC is possible in Input "H" level both CE0,CE1 terminal. FOUT terminal can output frequency when inputs "H"... -
Page 3: Electrical Characteristics
Electrical Characteristics 1. Absolute Maximum Ratings Description Symbol Conditions Rated values Unit Power supply Voltage -0.3 to +7.0 Input Voltage input pins GND-0.3 to V +0.3 Output Voltage / TIRQ,/ AIRQ -0.3 to +8.0 OUT1 FOUT,DATA GND-0.3 to V +0.3 OUT2 °C Temperature... - Page 4 5. AC Characteristics °C ( CL=50pF,Ta=-40 to 85 =3.0V±10% =5.0V±10% Description Symbol MIN. TYP. MAX. MIN. TYP. MAX. Unit CLK clock cycle 1200 CLK H Pulse Width CLK L Pulse Width CE setup time CE hold time CE recovery time CLK hold time Write DATA in setup time Write DATA in hold time...
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Page 5: Register Table
Register Table Address Function bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 Hour Week Month Year Minutes Alarm Hours Alarm Week Alarm Day Alarm FOUT control Timer interrupt control Count Down Timer Control 1 TI/TP Control 2 TEST STOP RESET HOLD 1.1 Timekeeping/calendar registers (register 0 to register 6) ·... - Page 6 1.2 Alarm registers (register 7 to register A) Alarms can be set for days of the week, hours, and minutes. Bit 7 of each alarm register is an AE bit that can be used to set an hourly alarm or a daily alarm. An alarm can also be set for multiple days of the week.However, when using the day of the week alarm, also set either or both the hour and minute alarms.
- Page 7 RESET HOLD · TEST bit : This is a test bit for Seiko-Epson?s use. Always set this bit to "0". When writing to the other bits in the CF register, be careful not to accidentally write a "1" to this bit. This bit is cleared by setting CE low.
- Page 8 n Usage Functional Overview The basic sequence for reads and writes is the same: after the CE input goes high, the 4-bit mode is set, the 4-bit address is specified, and then the data is read or written in 8-bit units.If the input of an 8-bit unit of data is not yet complete when the CE input is set low, the 8-bit data that was being written when the CE input went low is ignored.
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Page 9: Package Outline
Examples of External Connections Note 4.7uF SCI7701 Schottky or SCI7721 Barrier Diode RTC4573 Voltage Detector DATA 0.1uF / TIRQ / AIRQ FOUT D 1 : 1SS108 or Equivalent Vf = 0.1V Package Outline 11.4 0.15 1.8 2.0 MAX. 1.27 MIN. 0 - 10 0.12 Page-9... -
Page 10: Reference Data
Reference data ( 1 ) Frequency temperature characteristics Finding the frequency stability (clock error) ( typical ) 1. The frequency temperature characteristics can be = 25°C TYP. approximated by using the following expression: a = -0.035ppm/°C² TYP. (ppm)=a(q (ppm) : Frequency deviation at target temperature °C a (ppm/ : Secondary temperature coefficient... -
Page 11: Notes On Use
Notes on Use ( 1 ) Notes on handling In order to attain low power consumption, this module incorporates a CMOS IC. Therefore, the following points should be kept in mind when using this module. 1. Static electricity While this module does have built-in circuitry designed to protect it against damage from electrostatic discharge, the module could still be damaged by an extremely large electrostatic discharge. - Page 12 Under certain conditions, ultrasonic cleaning can damage the crystal resonator. Because we cannot specify the conditions under which you perform ultrasonic cleaning (including the type of cleaner, the power level, the duration, the condition of the inside of the chamber, etc.), Seiko-Epson does not warrant this product against ultrasonic cleaning.