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8025

Page - 6

ETM10E-04

8.2. Description of Registers

8.2.1. Register table

Address

Function

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

note

Seconds

S40

S20

S10

∗

Minutes

M40

M20

M10

∗

Hours

H20

H10

∗

Weekdays

∗

Days

D20

D10

∗

Months

MO10

MO8

MO4

MO2

MO1

∗

Years

Y80

Y40

Y20

Y10

−

Digital Offset

TEST

∗

Alarm_W ; Minute

WM40 WM20 WM10

WM8

WM4

WM2

WM1

∗

Alarm_W ; Hour

WH20

WP,/A

WH10

WH8

WH4

WH2

WH1

∗

Alarm_W ; Weekday

WW6

WW5

WW4

WW3

WW2

WW1

WW0

∗

Alarm_D ; Minute

DM40

DM20

DM10

DM8

DM4

DM2

DM1

∗

Alarm_D ; Hour

DH20

DH10

DH8

DH4

DH2

DH1

∗

Reserved

∗

Control 1

WALE

DALE /12

24 /CLEN2

TEST

CT2

CT1

CT0

∗

Control 2

VDSL

VDET

/XST

PON /CLEN1 CTFG WAFG DAFG

∗

Caution points:

∗

1. The PON bit is a power-on reset flag bit.

The PON bit is set to "1" when a reset occurs, such as during the initial power-up or when recovering from a
supply voltage drop. At the same time, all bits in the Control 1 and Control 2 registers except for the PON and /
XST bits are reset to "0".

Note: At this point, all other register values are undefined, so be sure to perform a reset before using the module.

Also, be sure to avoid entering incorrect date and time data, as clock operations are not guaranteed when
the time data is incorrect.

∗

2. The TEST bit is used by the manufacturer for testing. Be sure to set "0" for this bit.

∗

3. Read data from address-D are always "00", and The write access to address-D are invalid.

∗

4. All bits marked with a "

" in the above table should be set as "0". Their value when read will be "0".

∗

5. All bits marked with "

are read-only bits. Their value when read is always "0".

∗

6. When PON bit became 1 because power-on reset function worked, /CLEN1 and /CLEN2 bit become 0.

When /CLEN1 and /CLEN2 bit become 1 even if FOE input is "H", FOUT output stops.

FOE

input

/CLEN1

bit

/CLEN2

bit

FOUT

output

OFF (

)

32.768 kHz

OFF (

)

' Don't care.

Содержание RX-8025NB

Страница 1: ...ETM10E 04 Preliminary Application Manual Real Time Clock Module RX 8025SA NB Model Product Number RX 8025SA Q41802551xxxx00 RX 8025NB Q41802591xxxx00 ...

Страница 2: ...nd any technical information furnished if any for the development and or manufacture of weapon of mass destruction or for other military purposes You are also requested that you would not make the products available to any third party who may use the products for such prohibited purposes These products are intended for general use in electronic equipment When using them in specific applications th...

Страница 3: ...l Characteristics 4 8 1 Functional descriptions 5 8 1 Overview of Functions 5 8 2 Description of Registers 6 8 3 Clock Precision Adjustment Function 13 8 4 Periodic Interrupt Function 15 8 5 Alarm W function 17 8 6 Alarm D function 19 8 7 The various detection Functions 20 8 8 Reading Writing Data via the I2C Bus Interface 23 8 9 External Connection Example 27 9 External Dimensions Marking Layout ...

Страница 4: ... 3 0 V Typ 1 Overview This module is an I 2 C bus interface compliant real time clock which includes a 32 768 kHz quartz oscillator that has been adjusted for high precision In addition to providing a function for generating six types of interrupts a dual alarm function an oscillation stop detection function used to determine presence of valid internal data at power on and a power supply voltage m...

Страница 5: ...l controlling the output of FOUT pin with CLEN1 and CLEN2 bit The output of FOUT terminal stops when CLEN1bit and CLEN2 bit both sets to 1 FOUT output stops when FOE is Low or OPEN Status of FOUT output stopped is L The logic table FOE input CLEN1 bit CLEN2 bit FOUT output L Χ Χ OFF L 0 0 32 768 kHz 0 1 32 768 kHz 1 0 32 768 kHz H 1 1 OFF L Χ Don t care FOE terminal had pull down resistor built in...

Страница 6: ...Max 10 6 V Frequency temperature characteristics Top Ta 20 C to 70 C VDD 3 0 V 25 C reference 10 120 10 6 Oscillation start time tSTA Ta 25 C VDD 2 0 V 1 Max s Aging fa Ta 25 C VDD 3 0 V first year 5 Max 10 6 year 1 AC rank Precision gap per month 13 seconds excluding offset value 7 Electrical Characteristics 7 1 DC Electrical Characteristics 7 1 1 DC electrical characteristics 1 Unless otherwise ...

Страница 7: ...tHD STA 0 6 µs Stop condition setup time tSU STO 0 6 µs Start condition setup time tSU STA 0 6 µs Recovery time from stop condition to start condition tRCV 62 µs Data setup time tSU DAT 200 ns Data hold time tHD DAT 0 ns SDA L stable time after falling of SCL tPL DAT 0 9 µs SDA off stable time after falling of SCL tPZ DAT 0 9 µs Rising time of SCL and SDA input tR 300 ns Falling time of SCL and SD...

Страница 8: ...INTA pin A polling function is also provided to enable checking of each alarm mode by the host For details on the Alarm W function see 8 5 Alarm W function and for the Alarm D function see 8 6 Alarm D Function 5 Oscillation stop detection function power drop detection function voltage monitoring function and power on reset detection function The oscillation stop detection function uses registers t...

Страница 9: ... a reset occurs such as during the initial power up or when recovering from a supply voltage drop At the same time all bits in the Control 1 and Control 2 registers except for the PON and XST bits are reset to 0 Note At this point all other register values are undefined so be sure to perform a reset before using the module Also be sure to avoid entering incorrect date and time data as clock operat...

Страница 10: ...er Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 1 Minutes M40 M20 M10 M8 M4 M2 M1 This minute counter counts from 00 to 01 02 and up to 59 minutes after which it starts again from 00 minutes 3 Hour counter Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 2 Hours H20 P A H10 H8 H4 H2 H1 The hour counter counts hours and its clock mode differs according to the val...

Страница 11: ...ter Address Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 4 Days D20 D10 D8 D4 D2 D1 The updating of dates by the date counter varies according to the month setting A leap year is set whenever the year value is a multiple of four such as 04 08 12 88 92 or 96 Days Month Date update pattern Write Read 1 3 5 7 8 10 or 12 01 02 03 to 30 31 01 4 6 9 or 11 01 02 03 to 30 01 02 February in lea...

Страница 12: ...in is set to L and the WALE bit is set to 1 Note If the current date time is used as the Alarm_W setting the alarm will not occur until the counter counts up to the current date time i e an alarm will occur next time not immediately During 24 hour clock operation the Alarm_W Hours register s bit 5 WH20 WP A functions as WH20 two digit hour display and during 12 hour clock operation it functions as...

Страница 13: ...hour clock Be sure to select between 12 hour and 24 hour clock operation before writing the time data See also 3 Hour counter in section 8 2 4 4 CLEN2 bit It combines CLEN1 bit and is bit controlling FOUT output When CLEN1 and CLEN2 bit become 1 even if FOE input is H FOUT output stops If FOUT output is unnecessary it functions as RAM bit and is FOE L When PON bit became 1 because power on reset f...

Страница 14: ...op was detected result is that bit value is held until cleared to zero For details see 8 7 Detection Functions 3 XST bit This bit indicates the oscillation stop detection function s detection results If a 1 has already been written to this bit it is cleared to zero when stopping of internal oscillation is detected XST Data Description Write 0 The writes 0 are invalid 1 Sets the oscillation stop de...

Страница 15: ...AFG bit This bit is valid only when the WALE bit value is 1 The WAFG bit value becomes 1 when Alarm W has occurred The INTB L status that is set at this time can be set to OFF by writing a 0 to this bit WAFG Data Description Write 0 INTB pin OFF Hi z Default 1 The writes 1 are invalid Read 0 Alarm_W time setting does not match current time This bit s value is always 0 when the WALE bit s setting i...

Страница 16: ...0 6 in the forward ahead or reverse behind direction in units of 3 05 10 6 1 When not using this function be sure to set 0 for bits F6 to F0 2 This function operates every twenty seconds at 00 seconds 20 seconds and 40 seconds within each minute which changes the cycle of the periodic interrupts that occur via this timing See 8 4 Periodic Interrupt Function 8 3 2 Adjustment capacity 1 Adjustment r...

Страница 17: ... while taking 7 bit binary encoding into account subtract the adjustment data decimal from 128 80h Setting adjustment data 128 3 125 decimal 80h 03h 7Dh hexadecimal Example 2 Setting time backward Objective To adjust set back the clock precision when FOUT clock output is 32768 3 Hz 1 Determine the current amount of variance 32768 3 Hz 32768 3 32768 32768 32768 reference values 9 16 10 6 2 Calculat...

Страница 18: ... pin s periodic interrupt output status This status can be set as OFF by writing a 0 to this bit when INTA L CTFG Data Description Write 0 A 0 can be written only when the periodic interrupt is in level mode at which time the INTA pin is set to OFF Hi z status Only when Alarm_D does not match After a 0 is written the value still becomes 1 again at the next cycle Default 1 The writes 1 are invalid ...

Страница 19: ...auses the INTA level to go low L again Note 3 When using the clock precision adjustment function the periodic interrupt s cycle changes once every 20 seconds During pulse mode The period during which the output pulse is low can be adjusted backward or forward up to 3 784 msec For example the duty for the 1 Hz setting can be adjusted 0 3784 from 50 2 Level mode Select among four interrupt cycles on...

Страница 20: ...on it functions as an AM PM indicator When the Alarm_W function s day values WW6 to WW0 are all 0 Alarm W does not occur 1 WALE bit This bit is used to set up the Alarm W function to generate alarms matching day hour or minute settings WALE Data Description Write Read 0 Alarm_W match comparison operation invalid Default 1 Alarm_W match comparison operation valid INTB L when match occurs When using...

Страница 21: ...al days at the same time in which case be sure to set a 1 for each day among WW6 to WW0 in which an alarm will occur Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 Alarm_W Day WW6 WW5 WW4 WW3 WW2 WW1 WW0 Target day s W4 W2 W1 Saturday 1 1 0 Friday 1 0 1 Thursday 1 0 0 Wednesday 0 1 1 Tuesday 0 1 0 Monday 0 0 1 Sunday 0 0 0 8 5 2 Alarm setting examples Examples of settings for alarm usage...

Страница 22: ... to generate alarms matching hour or minute settings DALE Data Description Write Read 0 Alarm_D match comparison operation invalid Default 1 Alarm_D match comparison operation valid INTA L when match occurs When using the Alarm D function first set this DALE bit value as 0 then stop the function Next set the hour minute and the DAFG bit Finally set 1 to the DALE bit to set the Alarm D function as ...

Страница 23: ...eset from 0 V occurred due to a supply voltage drop When this function operates the PON bit value becomes 1 The XST and VDET bits can be used in combination to determine the valid invalid status of the clock and calendar data PON Data Description Write 0 Clears PON bit to zero and sets up for next detection operation 1 The writes 1 are invalid Read 0 Power on reset was not detected 1 Power on rese...

Страница 24: ...Example of voltage fluctuation that makes oscillation stop hard to detect VDD 8 7 3 Voltage drop detection This function detects when a voltage drop occurs Detection of a voltage drop changes the VDET bit value to 1 The threshold voltage value for detection can be set via the VDSL bit as 2 1 V or 1 3 V 1 VDSL bit This bit is used to set the power drop detection function s threshold voltage value V...

Страница 25: ...ck is normal but an abnormality exists in the power supply Backup power supply may have dropped to a hazardous level 1 0 Χ Supply voltage has dropped to 0 V Initialization is required regardless of the clock status and whether or not a voltage drop has occurred Initialization is required due to bits that are reset when PON 1 1 1 Χ Power supply flickering is likely The example shown above is when a...

Страница 26: ...e slave address in the received data 8 8 2 System configuration All ports connected to the I 2 C bus must be either open drain or open collector ports in order to enable AND connections to multiple devices SCL and SDA are both connected to the VDD line via a pull up resistance Consequently SCL and SDA are both held at high level when the bus is released when communication is not being performed Ma...

Страница 27: ... data become false setting occurs Therefore update of a clock counter of RX8025 is stopped temporarily to prevent this error when RX8025 receives a start condition A update of clock counter is revised afterwards when RX8025 receives a stop condition And clock of RX8025 is started again immediately However for example a RX8025 time continues stopping when STOP is not transmitted by power supply tro...

Страница 28: ...it of data on the SCL line the transmitter releases the SDA line and the receiver sets the SDA line to low acknowledge level SCL from Master SDA from transmitter sending side ACK signal 1 2 8 9 SDA from receiver receiving side Release SDA Low active After transmitting the ACK signal if the Master remains the receiver for transfer of the next byte the SDA is released at the falling edge of the cloc...

Страница 29: ...etting 0 h F h Transfer mode Address and transfer mode settings 1 Specifies the read start address 2 Specifies the Standard Read mode 0h 2 Simplified read method This RTC module also provides a special read method that uses fewer read steps bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 S A Slave address write specification This write is the writing of the read start address which occurs during a...

Страница 30: ...als at battery backup connect these pins to backup power supply RX 8025 VDD GND 4 7 µF 0 1 µF Schottky Barrier Diode Note VDD D 1 SCL INTA INTB FOE FOUT SDA TEST OPEN Note Use a secondary cell or lithium cell A diode is not required when using a secondary cell When using a lithium cell be sure to use a diode Contact the battery manufacturer for details regarding applied resistance values ...

Страница 31: ...25 0 1 Unit mm 6 3 Max 5 0 0 2 4 8 0 5 0 2 1 22 14 11 14 0 3 11 1 22 0 8 P 0 5 10 5 0 1 4 0 5 5 25 0 25 0 7 0 75 0 25 0 8 0 7 4 0 0 7 0 7 1 11 22 14 1 The cylinder of the crystal oscillator can be seen in this area back and front but it has no affect on the performance of the device 2 In this area At a parts side of electronic base you must not do layout any signal line 9 2 Marking Layout RX 8025 ...

Страница 32: ...overall clock accuracy add the frequency precision and voltage characteristics f f f fo fT fV f f Clock accuracy stable frequency in any temperature and voltage f fo Frequency precision fT Frequency deviation in any temperature fV Frequency deviation in any voltage 3 How to find the date difference Date difference f f 86400 seconds For example f f 11 574 10 6 is an error of approximately 1 second ...

Страница 33: ...ould be provided for all unused input pins 2 Notes on packaging 1 Soldering heat resistance If the temperature within the package exceeds 260 C the characteristics of the crystal oscillator will be degraded and it may be damaged The reflow conditions within our reflow profile is recommended Therefore always check the mounting temperature and time before mounting this device Also check again if the...

Страница 34: ...hai Branch High Tech Building 900 Yishan Road Shanghai 200233 China Phone 86 21 5423 5577 Fax 86 21 5423 4677 Shenzhen Branch 12 F Dawning Mansion 12 Keji South Road Hi Tech Park Shenzhen China Phone 86 755 2699 3828 Fax 86 755 2699 3838 EPSON HONG KONG LTD Unit 715 723 7 F Trade Square 681 Cheung Sha Wan Road Kowloon Hong Kong Phone 86 755 2699 3828 Shenzhen Branch Fax 86 755 2699 3838 Shenzhen B...

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