http://www.spezial.cz - - - [email protected] - - - Hotlines: Tel (02) 2434 2200 - - - Fax (02) 2434 3200 CONTENTS n Overview .............................................................................................................................................. 1 n Features............................................................................................................................................... 1 n Pin connections .................................................................................................................................. 1 n Block diagram ..................................................................................................................................... 1 n Pin functions ....................................................................................................................................... 1 n Characteristics .................................................................................................................................... 1 1. Absolute maximum ratings ........................................................................................................................ 1 2. Operating Conditions................................................................................................................................. 1 3. Frequency characteristics .......................................................................................................................... 1 4. DC characteristics ..................................................................................................................................... 1 5. AC characteristics ..................................................................................................................................... 1 6. Timing chart .............................................................................................................................................. 1 7. Data hold timing ........................................................................................................................................ 1 n Registers.............................................................................................................................................. 1 1. Register table ............................................................................................................................................ 1 2. Notes ........................................................................................................................................................ 1 n Register functions............................................................................................................................... 1 1. Date and time registers.............................................................................................................................. 1 2. Reset register (Control register D).............................................................................................................. 1 3. Reference signal (Control registers E and F) .............................................................................................. 1 n Package dimensions........................................................................................................................... 1 (1)RTC-58321 ............................................................................................................................................... 7 (2)RTC-58323 ............................................................................................................................................... 7 n Marking layout..................................................................................................................................... 1 n Application notes ................................................................................................................................ 1 EPSON 4BIT REAL TIME CLOCK MODULE with I/O CONNECTIONS RTC-58321/58323 n Overview The RTC-58321/58323 is a CMOS real time clock modules with perpetual calendar function developed for microcomputer applications. It has a built-in 32.768 kHz quartz resonator, and provides clock and calendar registers for year, month, day, day-of-week, hours, minutes and seconds, with 12-hour/24-hour selection, plus automatic leap-year correction with software selection for local calendars, and an additional periodic reference signal output. Being a CMOS device, it has a very low power consumption for battery back-up purposes. n Features l l l l l l l l l Adjustment-free built-in quartz resonator keeps component count low. Built-in clock and calendar registers for year, month, day, day-of-week, hours, minutes and seconds. 12-hour/24-hour selection. Automatic leap-year correction, with software selection for local calendars. Counter start, stop and reset functions. Periodic reference signal output selectable: 1024 Hz, or 1 second, 1 minute or 1 hour intervals. Data bus is 4-bit bidirectional, with memory-type reads and writes. CMOS device, for very low power consumption, and long battery back-up period. Compatible at pin and function levels with the MSM58321 RS. n Pin connections 1. CS2 2. WRITE 3. READ 14 to 16. VDD 13. CS1 12. TEST 4. D0 11. STOP 5. D1 10 BUSY 9. ADDRESS WRITE 6. D2 7. D3 8. GND * Connect power supply positive side to pin 16. 1 to 4. NC 18 to 24. VDD 5. CS2 17. CS1 6. WRITE 16. TEST 7. READ 15. STOP 8. D0 14. BUSY 9. D1 10. D2 11. D3 13. ADDRESS WRITE 12. GND NC: Pins are fixed low. * Connect power supply positive side to pin 24. Page - 1 RTC-58321/58323 n Block diagram 1024Hz 32.768 kHz quarts oscillator DATA BUS TEST 1/2 15 OSC R BUSY R 1Hz 1/10|1/6 Seconds BUSY or 1/12|1/24 Hours 1/10|1/6 Minutes 1/7 Day-of week 1/10|1/3 Day 1/12 Month 1/10|1/10 Year S10 N D 1Hz S1 1/60Hz M11 M110 H1 H10 W D1 D10 MO1 MO10 Y1 Y10 1/3600Hz 1024H z STOP R1’ TEST E, F SWITCH ADDRESS LATCH R1’ D10’ D11’ D12’ D13’ WRITE R1’ READ CS1 ADDRESS WRITE D0 D1 D2 D3 A1 A2 A3 R1’ CS2 A1' TRI-STATE CONTROL R1’ R1’ 0 1 2 3 4 5 6 7 8 9 A B C D E-F S1 S10 M11 M110 H1 H10 W D1 D10 M01 M010 Y1 Y10 D E-F R1’ u Rp = 200KΩ TYP n Pin functions Pin numbers Pin symbol Input/output Function RTC-58321 RTC-58323 1 5 CS2 Input Chip select. When high, device can be accessed. 2 6 WRITE Input Set high to write. 3 7 READ Input Set high to read. 4 to 7 8 to 11 D0 to D3 Both Address/data bus. 8 12 GND 9 13 ADDRESS WRITE Input 10 14 BUSY Output 11 15 STOP Input 1 Hz on/off control pin. When high, the 1 Hz signal is disabled, and the counter stopped. 12 16 TEST Input Increment pin for the counter. Normally this pin should be fixed low. 13 17 CS1 Input Connect to power down detection circuit. (Fix high if there is no power down detection circuit.) When CS1 is low, chip cannot be accessed, regardless of state of CS2. Negative power supply. Address latch. Set high to latch address from D0 to D3. 1 Hz output pin. * 1 to 4 NC Fix low. 14 to 16 18 to 24 VDD Positive power supply (normally +5 V). * A bypass capacitor (minimum 0.01 µF) must be connected between VDD and VSS, as close as possible. Page - 2 EPSON n Characteristics 1. Absolute maximum ratings Item Symbol Conditions (Pins) Rated Value Unit Power supply voltage VDD Ta = 25°C, VDD-VSS -0.3 to +7.0 V Input voltages VI Ta = 25°C input pins -0.3 to VDD +0.3 V Output voltages VO D0 to D3 Storage temperature TSTG Temperature stored as separate item. -0.3 to VDD +0.3 V Soldering temperature TSOL RTC-58321 Maximum 260°C for up to 10 seconds (pins); package maximum 150°C. RTC-58323 Maximum 260°C for up to 10 seconds (twice maximum), or maximum 230°C for up to three minutes. RTC-58321 -55 to +85 °C RTC-58323 -55 to +125 °C 2. Operating Conditions Item Symbol Min. Typ. Max. Unit Notes Power supply VDD 4.5 5.0 5.5 V VDD-VSS Data hold voltage *1 VDH 2.2 − 5.5 TOP -10 − 70 -30 − 85 Operating RTC-58321 temperature RTC-58323 *1 Data hold voltage: °C This is the range of power supply voltage for which the internal operation of the clock is guaranteed. I/O operations are not guaranteed. 3. Frequency characteristics Item Symbol RTC-58321 A Frequency tolerance RTC-58321 B ∆f/fO Conditions Max. Ta = 25°C ± 10 VDD = 5.0V fa Ta = 25°C :VDD = 5.0V ; first year ±5 ppm/y ppm ppm Temperature characteristics *2 tOP VDD = 5.0V ; Ta = -10 to 70°C + 10/-120 Voltage characteristics fV VDD = 2.2 to 5.5V Ta fixed, 5V reference ±2 *2 Deviation from the frequency at 25°C. Notes ppm 5 ± 20 RTC-58323 Aging ± 50 Unit 1. Frequency tolerance based on VDD = 5.0 V. 2. Frequency tolerance is value guaranteed on factory shipment. Page - 3 RTC-58321/58323 4. DC characteristics RTC-58321 (VDD = 5V ± 0.5V, Ta = -10 to 70°C) RTC-58323 (VDD = 5V ± 0.5V, Ta = -30 to 85°C) Item Symbol Conditions Min. High input voltage VIH1 *1 3.6 V VIH2 *2 VDD - 0.5 V Low input voltage VIL Low output voltage VOL IOL = 1.6mA Low output current IOL VOL = 0.4V 1.6 High input current IIH *3 VIH = 5V 10 Typ. Max. Unit 0.8 V 0.4 V mA 30 80 µA Low input current IIL *3 VIL = 0V -1 µA Input leakage current ILIH VIH = 5V 1 µA Input off-state leakage current ILIL VIL = 0V Input capacity CI f = 1MHz Current consumption IOP VDD = 5V VDD = 3V Oscillation start time *6 tOSC -1 5 pF *4 100 500 *5 20 40 *4 15 30 *5 7 20 1.5 3.0 VDD = 5V µA sec. Ta = 25°C *1 *2 *3 Pins CS2, WRITE, READ, ADDRESS WRITE, STOP, TEST and D0 to D3 CS1 Pins CS1, CS2, WRITE, READ, ADDRESS WRITE, STOP and TEST *4 CS1 and CS2 high, BUSY Open-circuit *5 CS1, CS2 and BUSY Open-circuit *6 Confirmed by BUSY 5. AC characteristics Q RTC-58321 (VDD = 5V ± 0.5V, Ta = -10 to 70°C) RTC-58323 (VDD = 5V ± 0.5V, Ta = -30 to 85°C) Item Symbol Conditions Min. Typ. Max. Unit Chip select set-up time tCS − 0 − − µS Address set-up time tAS − 0 − − µS Address write pulse width tAW − 0.5 − − µS Address hold time tAH − 0.1 − − µS Data set-up time tDS − 0 − − µS Write pulse width tWW − 2 − − µS Data hold time tDH − 0 − − µS Read inhibit time tRI − 0 − − µS Read access time tRA − − − Q µS Read delay time tDD − − − 1 µS Chip select hold time tCH − 0 − − µS tRA = 1µS + C×R×ln C R VHmin ln V DD V DD − V H min : capacitance of data line : pull-up resistance : high voltage level of IC connected to data line : natural logarithm Page - 4 EPSON 6. Timing chart CS1 CS2 Data invalid tCS tAS tAW tAH tDS tWW tDH tRI tRA D0 to D3 tDD tCH Data valid High impedance Address write Write Read Address bus in IC Data bus in IC Address Data-read Data-write 7. Data hold timing VDD 4.5V 4.5V 2.2 to 4.5V tCDR CS1 tR VIH2 VIH2 VIL IC can interact with external circuit CS1 ≤ 0.8V Data hold mode CS2 or WR must not be activated. Page - 5 VIL IC can interact with external circuit RTC-58321/58323 n Registers 1. Register table Address D3 D2 D1 D0 Register (hexadecimal) (A3) (A2) (A1) (A0) name D3 DATA 0 0 0 0 0 S1 s8 s4 s2 s1 0 to 9 Seconds units register 1 0 0 0 1 S0 * s40 s20 s10 0 to 5 Seconds tens register 2 0 0 1 0 MI1 mi8 mi4 mi2 mi1 0 to 9 Minutes units register 3 0 0 1 1 MI10 * mi40 mi20 mi10 0 to 5 Minutes tens register 4 0 1 0 0 H1 h8 h4 h2 h1 0 to 9 Hours units register 5 0 1 0 1 H10 24/12 pm/am h20 h10 0 to 1 or 0 to 2 Hours tens register 6 0 1 1 0 W * w4 w2 w1 0 to 6 Day-of-week register 7 0 1 1 1 D1 d8 d4 d2 d1 0 to 9 Day units register 8 1 0 0 0 D10 9 1 0 0 1 MO1 A 1 0 1 0 MO10 * B 1 0 1 1 Y1 y8 C 1 1 0 0 Y10 y80 D 1 1 0 1 * E 1 1 1 0 1hour F 1 1 1 1 D2 Leap year select mo8 Count value D1 Notes D0 d20 d10 0 to 3 Day tens register mo2 mo1 0 to 9 Month units register * * mo10 0 to 1 Month tens register y4 y2 y1 0 to 9 Year units register y40 y20 y10 0 to 9 Year tens register * * * mo4 1minute 1second 1024Hz Reset register Reference signal registers 2. Notes (1) The device uses positive logic, and a logic high voltage corresponds to a 1 in a register bit. (2) Do not set the clock to impossible dates (17:34 pm on February 30th, for example). The results are unpredictable. (3) When the device is powered on, the initial settings of all bits are undefined. n Register functions 1. Date and time registers (1) The register values are in BCD, and used positive logic. E.g.(S8, S4, S2, S1) = (1, 0, 0, 1) = 9 seconds (2) Day-of-week register The value is coded as 0 to 6, with Sunday = 0. Code Day 0 1 2 3 4 5 6 Sun. Mon. Tue. Wed. Thu. Fri. Sat. (3) pm/am, h20 and h10 registers The range of these values depends on whether the 12-hour or 24-hour clock is being used. The pm/am bit is used only when the 12-hour clock is selected. Set D3 to 1 for the 24-hour, and to 0 for the 12-hour clock. Set D2 to 1 for pm and to 0 for am. Writing a 1 to bit D3 automatically resets bit D2 to 0. Selection Value range 12-hour clock 12:00 to 11:59 am and pm * 24-hour clock 00:00 to 23:59 * Note: 12:00 am represents 12:00 midnight, and 12:00 pm represents 12:00 noon. (4) Y1 and Y10 Leap year selection Bits D3 and D2 of the day tens register select the year value module 4 to be used for leap years. Calendar D3 D2 Value module 4 for leap year Standard calendar 0 0 0 0 1 3 1 0 2 1 1 1 (5) Do not set the clock to impossible dates (17:34 pm on February 30th, for example). The results are unpredictable. Page - 6 EPSON 2. Reset register (Control register D) 15 Select this register to reset the last five stages of the 1/2 divider, and the busy circuit. Latch the hexadecimal value D using the ADDRESS LATCH pin, and set WRITE high to carry out the reset. 3. Reference signal (Control registers E and F) Latch the hexadecimal value E or F using the ADDRESS LATCH pin, and set WRITE high to obtain the reference signal values on D0 to D3. n Package dimensions (1) RTC-58321 (Unit:mm) (2) RTC-58323 Page - 7 RTC-58321/58323 n Marking layout Frequency tolerance RTC58321 B EPSON 4162 C Logo Note: The illustration is a general representation of the content and the location of information on the label, and is not a detailed specification of the typeface, size or positioning of printing used on the label. n Application notes (1) In order to realize low-power operation, the device has a high impedance; the shaded portion in the figure below is highly susceptible to inductance effects, and should be kept clear of signal lines. 16 15 14 13 12 11 10 9 RTC-58321 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 16 15 14 13 RTC-58323 1 2 3 4 5 6 7 8 9 10 11 12 (2) Power supply filter capacitor To ensure stable operation against transients and noise, connect a bypass capacitor of at least 0.01 µF (ceramic) across the power supply, close to the device. (3) This device passes a drop test (from 75 cm onto a hard board), but it is possible for the crystal resonator to be damaged by the shocks produced by some mounting equipment. It is important to confirm that the mounting conditions for the equipment being used do not adversely affect performance. Re-check if any of the mounting conditions change. (4) There is a possibility of damage to the crystal resonator during ultrasonic cleaning. Because of the wide variation of conditions in ultrasonic cleaning equipment, the performance of this device is not guaranteed if it is subject to ultrasonic cleaning. (5) This is a CMOS device, and the standard precautions against static electricity should be taken. Page - 8