Epson RTC-4573 Manual
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Epson RTC-4573, Page-1 Aug. 1998 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 ye
Epson RTC-4573, Page-2 Aug.1998 n nn n Pin Connection 2. 3 4 5 6 1. 7. 9 8. GND DD V N.C N.C N.C #1 #9 #10 #18 17 16 15 14 13 18 12 10 11. CLK DATA N.C / AIRQ CE1 N.C N.C N.C N.C / TIRQ N.C FOUT CE0 Symbol Pin-No. I / O Function CE1 5 Input Chip enable 1 input pin. This terminal has pull-down resistor built-in. Access to this RTC is possible in "H" level both CE0,CE1 terminal. FOUT terminal can output frequency when inputs "H" level into this terminal re
Epson RTC-4573, Page-3 Aug.1998 n Electrical Characteristics 1. Absolute Maximum Ratings Description Symbol Conditions Rated values Unit Power supply Voltage V DD - -0.3 to +7.0 V Input Voltage V IN1 input pins GND-0.3 to V DD +0.3 V Output Voltage V OUT1 / TIRQ,/ AIRQ -0.3 to +8.0 V V OUT2 FOUT,DATA GND-0.3 to V DD +0.3 Temperature T STG - -55 to +125 °C 2. Operating Condition Item Symbol Conditions MIN. MAX. Unit Supply Voltage V DD -1.65.5V Data Holding Voltage V CLK -1.65.5V Operating Temperature Range T OPR ° C 3. Frequency Characteristics Item Symbol Conditions Specifications Unit Frequency accuracy f / fo Ta=25 °C,V D
Epson RTC-4573, Page-4 Aug.1998 5. AC Characteristics ( CL=50pF,Ta=-40 to 85 ) V DD =3.0V±10% V DD =5.0V±10% Description Symbol MIN. TYP. MAX. MIN. TYP. MAX. Unit CLK clock cycle t CLK 1200 600 ns CLK H Pulse Width t WH 600 - - 300 - - ns CLK L Pulse Width t WL 600 - - 300 - - ns CE setup time t CS 300 - - 150 - - ns CE hold time t CH 400 - - 200 - - ns CE recovery time t CR 600 - - 300 - - ns CLK hold time t CKH 100 - - 50 - - ns Write DATA in setup time t DS 50 - - 50 - - ns Write DATA in hold time t DH 50 - - 50 - - ns Read DATA in delay time t RD 0 - 400 0 - 200 ns Output disable delay time t RZ - - 200 - - 1
Epson RTC-4573, Page-5 Aug.1998 n Register Table Address Function bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 0Secfos4020108421 1 Min fr 40 20 10 8 4 2 1 2 Hour fr * 20 10 8 4 2 1 3 Week fr 6 5 4 3 2 1 0 4Dayfr*20108421 5 Month fr * * 10 8 4 2 1 6 Year 80 40 20 10 8 4 2 1 7 Minutes Alarm AE 40 20 10 8 4 2 1 8 Hours Alarm AE * 20 10 8 4 2 1 9 Week Alarm AE 6 5 4 3 2 1 0 A Day Alarm AE * 20 10 8 4 2 1 B FOUT control FE * FD4 FD3 * FD2 FD1 FD0 C Timer interrupt control TE * TD1 TD0 * * * * D Count Down Timer 128 64 32 16 8 4 2 1 E Control 1 * * * TI/TP AF TF
Epson RTC-4573, 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. If the day of the week alarm is set by itself, the alarm may not be output properly.When the AE bit is "0", the register in question and the timekeeping r
Epson RTC-4573, Page-7 Aug.1998 1.5. Control register1 ( Reg-E ) Address bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 E * * * TI/TP AF TF AIE TIE TI / TPbits : ( Interrupt Signal Output Mode Select. Timer-Interrupt / Timer-Periodic ) output mode of timer signaling. bit 0 1 TI / TP TIRQ terminal is maintained by "L" till it is written in "0" at TF bit when turn into interrupt mode, and timer interrupt occurs, and, but, timer interrupt signal does it with TIE=1 Timer interrupt signaling is set in a mo
Page-8 Aug.1998 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
Epson RTC-4573, Page-9 Aug.1998 n Examples of External Connections RTC4573 VDD CE1 GND + Voltage Detector 4.7uF 0.1uF Schottky Barrier Diode Note VDD D 1 D 1 : 1SS108 or Equivalent Vf = 0.1V VO VDD VSS SCI7701 or SCI7721 CE0 DATA CLK / TIRQ / AIRQ FOUT n Package Outline 7.8 0.2 5.4 11.4 0.2 1.270.4 1.8 2.0 0.12 0.1 MAX. 0 0.15 0.6 0 - 10 0.2 MIN.
Epson RTC-4573, Page-10 Aug.1998 n Reference data ( 1 ) Frequency temperature characteristics ( typical ) q T = 25°C TYP. a = -0.035ppm/°C² TYP. Temperature [°C] Frequency dft[ppm] -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 -40-30-20-10 0 1020304050607080 Finding the frequency stability (clock error) 1. The frequency temperature characteristics can be approximated by using the following expression: D f T (ppm)= a ( q T - q X ) 2 D f T (ppm) : Frequency deviation at target temperature a (ppm/ 2 :
Epson RTC-4573, Page-11 Aug.1998 n 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. Therefore, packing materials and shipping containers should be made of conductive materials.Furthermore, use soldering equipment, t
Page-12 Aug.1998 ( 2 ) Notes on mounting 1. Soldering temperature conditions If the internal temperature of the package exceeds 260°C, the characteristics of the crystal resonator may deteriorate and the package may be damaged. Therefore, before using this module, be sure to confirm what temperatures it will be exposed to during the mounting pro
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