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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 4. D0 5. D1 6. D2 7. D3 8. GND * Connect power supply positive side to pin 16. 14 to 16. VDD 13. CS1 12. TEST 11. STOP 10 BUSY 9. ADDRESS WRITE
1 to 4. NC 5. CS2 6. WRITE 7. READ 8. D0 9. D1 10. D2 11. D3
18 to 24. VDD 17. CS1 16. TEST 15. STOP 14. BUSY 13. ADDRESS WRITE 12. GND
NC: Pins are fixed low. * Connect power supply positive side to pin 24.
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RTC-58321/58323
n Block diagram
1024Hz 32.768 kHz quarts oscillator OSC 1/2 15 R BUSY R DATA BUS TEST 1Hz 1/10|1/6 Seconds
S10
1/10|1/6 Minutes
or 1/12|1/24 Hours
1/7
Day-of week
1/10|1/3 Day
1/12 Month
1/10|1/10 Year
BUSY
N
D 1Hz 1024H z
S1 1/60Hz
M11 1/3600Hz
M110
H1
H10
W
D1
D10
MO1 MO10
Y1
Y10
STOP R1' TEST R1' WRITE R1' READ R1' CS1 CS2 ADDRESS WRITE D0 D1 D2 D3 R1' R1' R1'
SWITCH
E, F
ADDRESS LATCH D10' D11' D12' D13'
A1' A1 A2
A3
TRI-STATE CONTROL
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
u Rp = 200K TYP
n Pin functions
Pin numbers RTC-58321 1 2 3 4 to 7 8 9 10 11 12 13 RTC-58323 5 6 7 8 to 11 12 13 14 15 16 17 CS2 WRITE READ D0 to D3 GND ADDRESS WRITE BUSY STOP TEST CS1 Input Output Input Input Input Input Input Input Both Chip select. When high, device can be accessed. Set high to write. Set high to read. Address/data bus. Negative power supply. Address latch. Set high to latch address from D0 to D3. 1 Hz output pin. 1 Hz on/off control pin. When high, the 1 Hz signal is disabled, and the counter stopped. Increment pin for the counter. Normally this pin should be fixed low. 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. Fix low. Positive power supply (normally +5 V). Pin symbol Input/output Function
* 14 to 16
1 to 4 18 to 24
NC VDD
* A bypass capacitor (minimum 0.01 F) must be connected between VDD and VSS, as close as possible.
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EPSON
n Characteristics
1. Absolute maximum ratings
Item Power supply voltage Input voltages Output voltages Storage temperature Symbol VDD VI VO TSTG Conditions (Pins) Ta = 25C, VDD-VSS Ta = 25C input pins D0 to D3 Temperature stored as separate item. Rated Value -0.3 to +7.0 -0.3 to VDD +0.3 -0.3 to VDD +0.3 RTC-58321 RTC-58323 Soldering temperature TSOL RTC-58321 RTC-58323 -55 to +85 -55 to +125 Unit V V V C C
Maximum 260C for up to 10 seconds (pins); package maximum 150C. Maximum 260C for up to 10 seconds (twice maximum), or maximum 230C for up to three minutes.
2. Operating Conditions
Item Power supply Data hold voltage *1 Operating temperature RTC-58321 RTC-58323 Symbol VDD VDH TOP Min. 4.5 2.2 -10 -30 Typ. 5.0 - - - Max. 5.5 5.5 70 85 C Unit V Notes VDD-VSS
*1 Data hold voltage:
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 RTC-58321 A Frequency tolerance RTC-58321 B RTC-58323 Aging Temperature characteristics *2 Voltage characteristics *2 Deviation from the frequency at 25C. Notes 1. Frequency tolerance based on VDD = 5.0 V. 2. Frequency tolerance is value guaranteed on factory shipment. fa tOP fV Ta = 25C :VDD = 5.0V ; first year VDD = 5.0V ; Ta = -10 to 70C VDD = 2.2 to 5.5V Ta fixed, 5V reference f/fO Symbol Conditions Ta = 25C VDD = 5.0V Max. 10 50 5 20 5 + 10/-120 2 ppm/y ppm ppm ppm Unit
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RTC-58321/58323
4. DC characteristics
Item High input voltage Symbol VIH1 *1 VIH2 *2 Low input voltage Low output voltage Low output current High input current Low input current Input leakage current Input off-state leakage current Input capacity Current consumption VIL VOL IOL IIH *3 IIL *3 ILIH ILIL CI IOP IOL = 1.6mA VOL = 0.4V VIH = 5V VIL = 0V VIH = 5V VIL = 0V f = 1MHz VDD = 5V *4 *5 VDD = 3V *4 *5 Oscillation start time *6 tOSC VDD = 5V Ta = 25C *1 *2 *3 *4 *5 *6 Pins CS2, WRITE, READ, ADDRESS WRITE, STOP, TEST and D0 to D3 CS1 Pins CS1, CS2, WRITE, READ, ADDRESS WRITE, STOP and TEST CS1 and CS2 high, BUSY Open-circuit CS1, CS2 and BUSY Open-circuit Confirmed by BUSY 5 100 20 15 7 1.5 500 40 30 20 3.0 sec. 1.6 10 30 80 -1 1 -1 pF A Conditions Min. 3.6 VDD - 0.5 0.8 0.4 RTC-58321 (VDD = 5V 0.5V, Ta = -10 to 70C) RTC-58323 (VDD = 5V 0.5V, Ta = -30 to 85C) Typ. Max. Unit V V V V mA A A A
5. AC characteristics
Item Chip select set-up time Address set-up time Address write pulse width Address hold time Data set-up time Write pulse width Data hold time Read inhibit time Read access time Read delay time Chip select hold time Q tRA = 1S + CxRxln C R VHmin ln
V DD V DD - V H min
RTC-58321 (VDD = 5V 0.5V, Ta = -10 to 70C) RTC-58323 (VDD = 5V 0.5V, Ta = -30 to 85C) Symbol tCS tAS tAW tAH tDS tWW tDH tRI tRA tDD tCH Conditions - - - - - - - - - - - Min. 0 0 0.5 0.1 0 2 0 0 - - 0 Typ. - - - - - - - - - - - Max. - - - - - - - - Q 1 - Unit S S S S S S S S S S S
: capacitance of data line : pull-up resistance : high voltage level of IC connected to data line : natural logarithm
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EPSON
6. Timing chart
CS1
CS2 tCS tAS tAW tAH tDS tWW tDH tRI
Data invalid tRA tDD tCH
D0 to D3
Data valid
High impedance Address write
Write
Read Address bus in IC
Data bus in IC Address Data-write Data-read
7. Data hold timing
VDD
4.5V 2.2 to 4.5V
4.5V
CS1 VIH2
tCDR CS1 0.8V Data hold mode CS2 or WR must not be activated.
tR VIH2
VIL IC can interact with external circuit
VIL IC can interact with external circuit
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RTC-58321/58323
n Registers
1. Register table
Address (hexadecimal) 0 1 2 3 4 5 6 7 8 9 A B C D E F D3 (A3) 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D2 (A2) 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D1 (A1) 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 D0 (A0) 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Register name S1 S0 MI1 MI10 H1 H10 W D1 D10 MO1 MO10 Y1 Y10 D3 s8 * mi8 * h8 24/12 * d8 D2 s4 s40 mi4 mi40 h4 pm/am w4 d4 DATA D1 s2 s20 mi2 mi20 h2 h20 w2 d2 d20 mo2 * y2 y20 * D0 s1 s10 mi1 mi10 h1 h10 w1 d1 d10 mo1 mo10 y1 y10 * 1024Hz 0 to 9 0 to 5 0 to 9 0 to 5 0 to 9 0 to 1 or 0 to 2 0 to 6 0 to 9 0 to 3 0 to 9 0 to 1 0 to 9 0 to 9 Count value Notes
Seconds units register Seconds tens register Minutes units register Minutes tens register Hours units register Hours tens register Day-of-week register Day units register Day tens register Month units register Month tens register Year units register Year tens register Reset register Reference signal registers
Leap year select mo8 * y8 y80 * 1hour mo4 * y4 y40 *
1minute 1second
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 Sun. 1 Mon. 2 Tue. 3 Wed. 4 Thu. 5 Fri. 6 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 12-hour clock 24-hour clock Value range 12:00 to 11:59 am and pm * 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 Standard calendar D3 0 0 1 1 D2 0 1 0 1 Value module 4 for leap year 0 3 2 1
(5) Do not set the clock to impossible dates (17:34 pm on February 30th, for example). The results are unpredictable.
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EPSON
2. Reset register (Control register D)
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.
15
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
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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 F (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.
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