S-35399A02

Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 The S-35399A02 is a CMOS 2-wire real-time clock IC which operates with the very low current consumption and in the wide range of operation voltage. The operation voltage is 1.3 V to 5.5 V so that this IC can be used for various power supplies from main supply to backup battery. Due to the 0.34 µA current consumption and wide range of power supply voltage at time keeping, this IC makes the battery life longer. In the system which operates with a backup battery, the included free registers can be used as the function for user’s backup memory. Users always can take back the information in the registers which is stored before power-off the main power supply, after the voltage is restored. This IC has the function to correct advance/delay of the clock data speed, in the wide range, which is caused by the oscillation circuit’s frequency deviation. Correcting according to the temperature change by combining this function and a temperature sensor, it is possible to make a high precise clock function which is not affected by the ambient temperature. This IC has the function for the external microcomputer’s sub clock to output the 32.768 kHz clock pulse. And for this output, users can select either of Nch open drain or CMOS. Moreover, this IC has a 24-bit binary up counter. This counter counts up every 60 sec from power-on so that users are able to grasp the elapsed time from power-on up to 30 years. Features • • • • • • • • • • • • • • • Low current consumption : 0.34 µA typ. (VDD = 3.0 V, Ta = 25°C) Wide range of operating voltage : 1.3 to 5.5 V Built-in clock-correction function Clock pulse output (CMOS output, function to select frequency) 32.768 kHz clock pulse output (Nch open-drain, output control pin) Built-in 24-bit binary up counter Built-in free user register 2-wire (I2C-bus) CPU interface Built-in alarm interrupter Built-in flag generator during detection of low power voltage or at power-on Auto calendar up to the year 2099, automatic leap year calculation function Built-in constant voltage circuit Built-in 32.768 kHz crystal oscillator (Cd built in, Cg external) Package : WLP-12A Lead-free product Applications • • • • • • • • • Mobile game devices Mobile AV devices Digital still cameras Digital video cameras Electronic power meters DVD recorders TVs, VCRs Mobile phones, PHS Car navigation Package Package Name WLP-12A Drawing Code Package HA012-A Tape HA012-A Reel HA012-A Seiko Instruments Inc. 1 2-WIRE REAL-TIME CLOCK S-35399A02 Pin Configuration WLP-12A Bottom View Rev.1.0_00 D3 F32K C3 VDD B3 SCL A3 INT2 A2 SDA A1 VSS D2 C2 B2 FOUT INT1 CTRL D1 C1 VDDL XOUT B1 XIN (1.84 × 1.97 × 0.6 max) Figure 1 Marking Specifications Top View 399A 0 2 (1) (2) Lot number Figure 2 List of Pin Table 1 Pin No. A1 B1 C1 D1 A2 Symbol VSS XIN XOUT VDDL SDA Description GND pin Connection pin for crystal oscillator Power supply pin for FOUT output I/O pin for serial data I/O − − − Configuration − − − B2 C2 CTRL INT 1 FOUT INT2 D2 A3 B3 C3 D3 SCL VDD F32K Nch open-drain output Bi-directional (no protective diode at VDD) CMOS input CMOS input Control pin for F32K output Input (built-in pull-down resistor. no protective diode at VDD) Nch open-drain output Output pin for interrupt signal Output (no protective diode at VDD) Output pin for clock pulse Output CMOS output signal Nch open-drain output Output pin for interrupt signal Output (built-in pull-down resistor. no protective diode at 2 VDD) CMOS input Input pin for serial clock Input (no protective diode at VDD) Pin for positive power supply − − Nch open-drain output Pin for 32.768 kHz output Output (no protective diode at VDD) 2 Seiko Instruments Inc. Rev.1.0_00 Pin Functions • 2-WIRE REAL-TIME CLOCK S-35399A02 SDA (I/O for serial data) pin This pin is to data input/output for I2C-bus interface. This pin inputs/outputs data by synchronizing with a clock pulse from the SCL pin. This pin has CMOS input and Nch open drain output. Generally in use, pull up this pin to the VDD potential via a resistor, and connect it to any other device having open drain or open collector output with wired-OR connection. • SCL (input for serial clock) pin This pin is to input a clock pulse for I2C-bus interface. The SDA pin inputs/outputs data by synchronizing with the clock pulse. • XIN, XOUT (crystal oscillator connect) pin Connect a crystal oscillator between XIN and XOUT. • INT1 (output for interrupt signal 1) pin This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm 1 interrupt, output of user-set frequency, per-minute edge interrupt, minute-periodical interrupt 1, minute-periodical interrupt 2, or 32.768 kHz output. This pin has Nch open drain output. • INT2 (output for interrupt signal 2) pin This pin outputs a signal of interrupt, or a clock pulse. By using the status register 2, users can select either of; alarm 2 interrupt, output of user-set frequency, per-minute edge interrupt or minute-periodical interrupt 1. This pin has Nch open drain output. • CTRL (F32K output control) pin This pin is to control output from the F32K pin, has a pull-down resistor. This pin outputs a clock pulse from the F32K pin when the CTRL pin is in “H”. It does not do so when the CTRL pin is in “L” or open. Set this CTRL pin to “L” or open at power-on. To output 32.768 kHz from the F32K pin, after power-on, set the CTRL pin to “H” more than one sec after. • F32K (32.768 kHz output) pin This pin has the function to output-control, outputs 32.768 kHz. When the CTRL pin is in “H”, this pin outputs the 32.768 kHz clock pulse, when the CTRL pin is in “L” or open, the status is in high impedance. This pin has Nch open drain output. • FOUT (output for clock pulse signal) pin This pin is to output the clock pulse selected by users. Users can select the frequency by using the FOUT setting register 1 and 2. This pin outputs “L” at power-on. This pin has CMOS output. • VDD (positive power supply) pin Connect this VDD pin with a positive power supply. Regarding the values of voltage to be applied, refer to “ Recommended Operation Conditions”. • VDDL (positive power supply for FOUT output) pin This pin is for positive power supply for the FOUT pin’s output. Set the value of voltage to be applied as VDDL ≤ VDD. • VSS pin Connect this VSS pin to GND. Seiko Instruments Inc. 3 2-WIRE REAL-TIME CLOCK S-35399A02 Equivalent Circuits of I/O Pin SDA Rev.1.0_00 SCL Figure 3 SDA Pin Figure 4 SCL Pin INT1, INT2, F32K CTRL Figure 5 INT1 Pin, INT2 Pin, F32K Pin Figure 6 CTRL Pin VDDL FOUT Figure 7 FOUT Pin and VDDL Pin 4 Seiko Instruments Inc. Rev.1.0_00 Block Diagram 2-WIRE REAL-TIME CLOCK S-35399A02 CTRL XIN XOUT Oscillator 32.768 kHz controller F32K Divider, timing generator INT1 controller VDDL FOUT INT1 register Clock correction register Alarm expansion register 1 INT1 Status register 1 Comparator 1 Status register 2 Second Minute Hour Day of Day Month Year week Real-time data register FOUT setting register 1 Comparator 2 INT2 FOUT setting register 2 INT2 register Free register Alarm expansion register 2 INT2 controller 24-bit binary up counter SDA SCL Shift register Serial interface VDD Low power supply voltage detector Constantvoltage circuit Power-on detector VSS Figure 8 Seiko Instruments Inc. 5 2-WIRE REAL-TIME CLOCK S-35399A02 Absolute Maximum Ratings Table 2 Parameter Power supply voltage 1 Power supply voltage 2 Input voltage Output voltage 1 Symbol VDD VDDL VIN VOUT1 Applicable Pin − − SCL, SDA, CTRL Rating VSS − 0.3 to VSS + 6.5 VSS − 0.3 to VDD VSS − 0.3 to VSS + 6.5 VSS − 0.3 to VSS + 6.5 Rev.1.0_00 SDA, INT 1 , INT2 , F32K Output voltage 2 VOUT2 FOUT VSS − 0.3 to VDDL V Operating ambient − −40 to +85 °C Topr temperature *1 Storage temperature Tstg − −55 to +125 °C *1. Conditions with no condensation or frost. Condensation and frost cause short circuiting between pins, resulting in a malfunction. Unit V V V V Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Recommended Operation Conditions Table 3 Parameter Symbol Conditions Min. Typ. Max. Power supply voltage 1*1 VDD Ta = −40 to +85°C 1.3 3.0 5.5 Power supply voltage 2 VDDL Ta = −40 to +85°C 1.3 − VDD Time keeping power VDDT Ta = −40 to +85°C VDET − 0.15 − 5.5 V supply voltage *2 Crystal oscillator CL value CL − − 6 7 pF *1. The power supply voltage that allows communication under the conditions shown in Table 8 of “ AC Electrical Characteristics”. *2. The power supply voltage that allows time keeping. For the relationship with VDET (low power supply voltage detection voltage), refer to “ Characteristics (Typical Data)”. (VSS = 0 V) Unit V V Oscillation Characteristics Table 4 (Ta = 25°C, VDD = 3.0 V, VSS = 0 V, SP-T2A crystal oscillator (CL = 6 pF, 32.768 kHz) manufactured by Seiko Instruments Inc.) Parameter Symbol Conditions Min. Typ. Max. Unit Oscillation start voltage VSTA Within 10 seconds 1.1 − 5.5 V Oscillation start time tSTA CTRL pin = “L” or open − − 1 s IC-to-IC frequency δIC − −10 − +10 ppm deviation *1 Frequency voltage δV VDD = 1.3 to 5.5 V −3 − +3 ppm/V deviation External capacitance Cg Applied to XIN pin − − 9.1 pF Internal oscillation Applied to XOUT pin − 8 − pF Cd capacitance Applied when 32.768 kHz is output − 60 % 40 Duty ratio Duty from either INT1 , F32K, or FOUT pin *1. Reference value 6 Seiko Instruments Inc. Rev.1.0_00 DC Electrical Characteristics 2-WIRE REAL-TIME CLOCK S-35399A02 Table 5 DC Characteristics (VDD = 3.0 V) (Ta = −40 to +85°C, VSS = 0 V, SP-T2A crystal oscillator (CL = 6 pF, 32.768 kHz, Cg = 9.1 pF) manufactured by Seiko Instruments Inc.) Parameter Symbol Applicable Pin Conditions Min. Typ. Max. Unit Current − Out of communication − 0.34 0.97 µA IDD1 consumption 1 Out of communication (when 32.768 kHz is Current − 0.60 1.47 µA − IDD2 output from F32K pin consumption 2 Current consumption 3 Input current leakage 1 Input current leakage 2 Input current 1 Input current 2 Input current 3 Output current leakage 1 IDD3 IIZH IIZL IIH1 IIH2 IIH3 IOZH − or INT 1 pin) During communication (SCL = 100 kHz) − −0.5 −0.5 9 − − 14 0.5 0.5 16 300 − µA µA µA µA µA µA SCL, SDA SCL, SDA CTRL CTRL CTRL SDA, INT 1 , INT2 , F32K VIN = VDD VIN = VSS VIN = VDD VIN = 0.4 V VIN = 1.0 V 2 40 − −0.5 6 100 215 − VOUT1 = VDD 0.5 µA Output current leakage 2 IOZL Input voltage 1 Input voltage 2 Output current 1 VIH VIL IOL1 SDA, INT 1 , VOUT1 = VSS INT2 , F32K SCL, SDA, CTRL − SCL, SDA, CTRL − −0.5 − − − 0.5 VSS + 5.5 0.2 × VDD − − −1 µA 0.8 × VDD VSS − 0.3 V V Output current 2 Output current 3 Power supply voltage detection voltage IOL2 IOH VDET INT 1 , INT2 , F32K SDA, FOUT FOUT − VOUT1 = 0.4 V VOUT1 = VOUT2 = 0.4 V VOUT2 = VDD − 0.4 V Ta = −40 to +85°C 3 5 − 0.65 5 10 −1.5 1 mA mA mA V 1.35 Seiko Instruments Inc. 7 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 Table 6 DC Characteristics (VDD = 5.0 V) (Ta = −40 to +85°C, VSS = 0 V, SP-T2A crystal oscillator (CL = 6 pF, 32.768 kHz, Cg = 9.1 pF) manufactured by Seiko Instruments Inc.) Parameter Symbol Applicable Pin Conditions Min. Typ. Max. Unit Current − Out of communication − 0.36 1.18 µA IDD1 consumption 1 Out of communication (when 32.768 kHz is Current − 0.82 2.17 µA − IDD2 output from F32K pin consumption 2 Current consumption 3 Input current leakage 1 Input current leakage 2 Input current 1 Input current 2 Input current 3 Output current leakage 1 IDD3 IIZH IIZL IIH1 IIH2 IIH3 IOZH − or INT 1 pin) During communication (SCL = 100 kHz) − −0.5 −0.5 20 − − 30 0.5 0.5 50 350 − µA µA µA µA µA µA SCL, SDA SCL, SDA CTRL CTRL CTRL SDA, INT 1 , INT2 , F32K VIN = VDD VIN = VSS VIN = VDD VIN = 0.4 V VIN = 2.0 V 8 40 − −0.5 16 150 610 − VOUT1 = VDD 0.5 µA Output current leakage 2 IOZL Input voltage 1 Input voltage 2 Output current 1 VIH VIL IOL1 SDA, INT 1 , VOUT1 = VSS INT2 , F32K SCL, SDA, CTRL − SCL, SDA, CTRL − −0.5 − − − 0.5 VSS + 5.5 0.2 × VDD − − −1.5 µA 0.8 × VDD VSS − 0.3 V V Output current 2 Output current 3 Power supply voltage detection voltage IOL2 IOH VDET INT 1 , INT2 , F32K SDA, FOUT FOUT − VOUT1 = 0.4 V VOUT1 = VOUT2 = 0.4 V VOUT2 = VDD − 0.4 V Ta = −40 to +85°C 5 6 − 0.65 8 13 −2.3 1 mA mA mA V 1.35 8 Seiko Instruments Inc. Rev.1.0_00 AC Electrical Characteristics Table 7 Measurement Conditions Input pulse voltage Input pulse rise/fall time Output determination voltage Output load VIH = 0.8 × VDD, VIL = 0.2 × VDD 20 ns VOH = 0.5 × VDD, VOL = 0.5 × VDD 100 pF + pull-up resistor 1 kΩ 2-WIRE REAL-TIME CLOCK S-35399A02 VDD R = 1 kΩ SDA C = 100 pF Remark The power supplies of the IC and load have the same electrical potential. Figure 9 Output Load Circuit Table 8 Parameter SCL clock frequency SCL clock low time SCL clock high time SDA output delay time*1 Start condition setup time Start condition hold time Data input setup time Data input hold time Stop condition setup time SCL, SDA rise time SCL, SDA fall time Bus release time Noise suppression time AC Electrical Characteristics Symbol fSCL tLOW tHIGH tPD tSU.STA tHD.STA tSU.DAT tHD.DAT tSU.STO tR tF tBUF tI VDD *2 ≥ 1.3 V Min. Typ. Max. 0 − 100 4.7 − − 4 − − 3.5 − − 4.7 − − 4 − − 250 − − 0 − − 4.7 − − 1 − − 0.3 − − 4.7 − − 100 − − (Ta = −40 to +85°C) VDD *2 ≥ 3.0 V Unit Min. Typ. Max. 0 − 400 kHz µs 1.3 − − µs 0.6 − − 0.9 µs − − 0.6 µs − − 0.6 µs − − 100 − − ns 0 µs − − µs 0.6 − − 0.3 µs − − 0.3 µs − − µs 1.3 − − 50 ns − − *1. Since the output format of the SDA pin is Nch open-drain output, SDA output delay time is determined by the values of the load resistance (RL) and load capacity (CL) outside the IC. Therefore, use this value only as a reference value. *2. Regarding the power supply voltage, refer to “ Recommended Operation Conditions”. tF tHIGH tLOW tR SCL tHD.DAT tSU.DAT tSU.STO tSU.STA tHD.STA SDA (Input from S-35399A02) tPD tBUF SDA (Output from S-35399A02) Figure 10 Bus Timing Seiko Instruments Inc. 9 2-WIRE REAL-TIME CLOCK S-35399A02 Configuration of Data Communication 1. Configuration of data Communication Rev.1.0_00 For data communication, the master device in the system generates a start condition for the S-35399A02. Next, the master device transmits 4-bit device code “0110” or “0111”, and 3-bit command and 1-bit Read/Write command to the SDA bus. After that, output or input is performed from B7 of data. If data I/O has been completed, finish communication by inputting a stop condition to the S-35399A02. The master device generates an acknowledgment signal for every 1-byte. Regarding details, refer to “ Serial Interface”. Device code “0110” is compatible with the SII S-35390A/392A as software. Regarding details, refer to “2. Configuration of command”. Start condition Device code STA 0 1 1 0/1 C2 Command C1 C0 Read/Write bit Acknowledgment bit R/W ACK Stop condition 1-byte data B7 B6 B5 B4 B3 B2 B1 B0 ACK STP Figure 11 Data Communication 10 Seiko Instruments Inc. Rev.1.0_00 2. Configuration of command 2-WIRE REAL-TIME CLOCK S-35399A02 13 types of command are available for the S-35399A02, The S-35399A02 does Read/Write the various registers by inputting these codes and commands. The S-35399A02 does not perform any operation with any codes and commands other than those below. Table 9 List of Command Code C2 C1 C0 0 0 0 0 0 1 Command Description Status register 1 access Status register 2 access Data B7 B6 B5 B4 SC1*2 32kE Y8 M8 D8 −*6 H8 m8 s8 B3 INT1*3 B2 INT2*3 B1 BLD*4 B0 POC*4 RESET*1 12 / 24 SC0*2 INT1FE INT1ME INT1AE 0 1 0 Real-time data 1 access (year data to) Y1 M1 D1 W1 H1 m1 s1 Y2 M2 D2 W2 H2 m2 s2 Y4 M4 D4 W4 H4 m4 s4 *5 INT2FE INT2ME INT2AE TEST Y40 Y80 Y10 Y20 −*6 −*6 −*6 M10 *6 − −*6 D20 D10 *6 *6 *6 *6 − − − − −*6 H10 H20 AM / PM −*6 m10 m20 m40 −*6 s10 s20 s40 0 1 1 Real-time data 2 access (hour data to) H1 m1 s1 H2 m2 s2 H4 m4 s4 H8 m8 s8 −*6 H8 m8 H10 m10 s10 −*6 H10 m10 H20 m20 s20 −*6 H20 m20 AM / PM m40 s40 − −*6 −*6 *6 0110 1 0 0 1 0 1 V0 V1 V2 V3 V4 V5 V6 V7 F0 F1 F2 F3 F4 F5 F6 F7 C64k C128k C256k C512k C1M C2M C4M C8M *7 0 0 0 Up counter access C256 C512 C1k C2k C4k C8k C16k C32k C1 C2 C4 C8 C16 C32 C64 C128 0 0 1 FOUT setting register 1 access 256 Hz 512 Hz 1 kHz 2 kHz 4 kHz 8 kHz 16 kHz 32 kHz 0 1 0 FOUT setting register 2 access 1 Hz 2 Hz 4 Hz 8 Hz 16 Hz 32 Hz 64 Hz 128 Hz 0111 Y80 Y1 Y40 Y2 Y4 Y8 Y10 Y20 Alarm expansion register 1 access *6 − 100 M1 A1YE A1ME M2 M4 M8 M10 (alarm time 1 : year/month/day) −*6 D20 A1DE D1 D2 D4 D8 D10 Y80 Y1 Y40 Y2 Y4 Y8 Y10 Y20 Alarm expansion register 2 access −*6 101 M1 A2YE A2ME M2 M4 M8 M10 (alarm time 2 : year/month/day) −*6 D20 A2DE D1 D2 D4 D8 D10 *1. Write-only flag. The S-35399A02 initializes by writing “1” in this register. *2. Scratch bit. A R/W-enabled, user-free register. *3. Read-only flag. Valid only when using the alarm function. When the alarm time matches, this flag is set to “1”, and it is cleared to “0” when Read. *4. Read-only flag. “POC” is set to “1” when power is applied. It is cleared to “0” when Read. Regarding “BLD”, refer to “ Low Power Supply Voltage Detection Circuit”. *5. Test bit for SII. Be sure to set “0” in use. *6. No effect by Write. It is “0” when Read. *7. The up counter is a Read-only register. 1 1 1 1 0 1 INT1 register access (alarm time 1: week/hour/minute) (INT1AE = 1, INT1ME = 0, INT1FE = 0) INT1 register access (output of user-set frequency) (INT1ME = 0, INT1FE = 1) INT2 register access (alarm time 2: week/hour/minute) (INT2AE = 1, INT2ME = 0, INT2FE = 0) INT2 register access (output of user-set frequency) (INT2ME = 0, INT2FE = 1) Clock correction register access Free register access W1 H1 m1 W2 H2 m2 W4 H4 m4 A1WE AM / PM A1HE A1mE m40 SC4 *2 −*6 1 Hz W1 H1 m1 2 Hz W2 H2 m2 4 Hz W4 H4 m4 8 Hz −*6 H8 m8 16 Hz −*6 H10 m10 SC2 *2 SC3 *2 −*6 H20 m20 −*6 A2WE AM / PM A2HE A2mE m40 SC6 *2 SC7 *2 1 Hz 2 Hz 4 Hz 8 Hz 16 Hz SC5 *2 Seiko Instruments Inc. 11 2-WIRE REAL-TIME CLOCK S-35399A02 Configuration of Register 1. Real-time data register Rev.1.0_00 The real-time data register is a 7-byte register that stores the data of year, month, day, day of the week, hour, minute, and second in the BCD code. To Write/Read real-time data 1 access, transmit/receive the data of year in B7, month, day, day of the week, hour, minute, second in B0, in 7-byte. When you skip the procedure to access the data of year, month, day, day of the week, Read/Write real-time data 2 access. In this case, transmit/receive the data of hour in B7, minute, second in B0, in 3-byte. Year data (00 to 99) Start bit of real-time data 1 data access Y1 B7 Month data (01 to 12) M1 B7 Day data (01 to 31) D1 B7 Day of week data (00 to 06) W1 B7 Hour data (00 to 23 or 00 to 11) Start bit of real-time data 2 data access H1 B7 H2 H4 H8 H10 H20 0 B0 W2 W4 0 0 0 0 0 B0 D2 D4 D8 D10 D20 0 0 B0 M2 M4 M8 M10 0 0 0 B0 Y2 Y4 Y8 Y10 Y20 Y40 Y80 B0 AM / PM Minute data (00 to 59) m1 B7 m2 m4 m8 m10 m20 m40 0 B0 Second data (00 to 59) s1 B7 s2 s4 s8 s10 s20 s40 0 B0 Figure 12 Real-Time Data Register 12 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 Year data (00 to 99): Y1, Y2, Y4, Y8, Y10, Y20, Y40, Y80 Sets the lower two digits in the Western calendar year (00 to 99) and links together with the auto calendar function until 2099. Example: 2053 (Y1, Y2, Y4, Y8, Y10, Y20, Y40, Y80) = (1, 1, 0, 0, 1, 0, 1, 0) Month data (01 to 12): M1, M2, M4, M8, M10 Example: December (M1, M2, M4, M8, M10, 0, 0, 0) = (0, 1, 0, 0, 1, 0 ,0 ,0) Day data (01 to 31): D1, D2, D4, D8, D10, D20 The count value is automatically changed by the auto calendar function. 1 to 31: Jan., Mar., May, July, Aug., Oct., Dec., 1 to 30: April, June, Sep., Nov. 1 to 29: Feb. (leap year), 1 to 28: Feb. (non-leap year) Example: 29 (D1, D2, D4, D8, D10, D20, 0, 0) = (1, 0, 0, 1, 0, 1, 0, 0) Day of the week data (00 to 06): W1, W2, W4 A septenary up counter. Day of the week is counted in the order of 00, 01, 02, …, 06, and 00. Set up day of the week and the count value. Hour data (00 to 23 or 00 to 11): H1, H2, H4, H8, H10, H20, AM / PM In a 12-hour expression, write 0; AM, 1; PM in the AM / PM bit. In a 24-hour expression, users can Write either 0 or 1. 0 is read when the hour data is from 00 to 11, and 1 is read when from 12 to 23. Example (12-hour expression): 12 p.m. (H1, H2, H4, H8, H10, H20, AM/PM, 0) = (0, 1, 0, 0, 1, 0, 1, 0) Example (24-hour expression): 22 (H1, H2, H4, H8, H10, H20, AM/PM, 0) = (0, 1, 0, 0, 0, 1, 1, 0) Minute data (00 to 59): m1, m2, m4, m8, m10, m20, m40 Example: 32 minutes (m1, m2, m4, m8, m10, m20, m40, 0) = (0, 1, 0, 0, 1, 1, 0, 0) Example: 55 minutes (m1, m2, m4, m8, m10, m20, m40, 0) = (1, 0, 1, 0, 1, 0, 1, 0) Second data (00 to 59): s1, s2, s4, s8, s10, s20, s40 Example: 19 seconds (s1, s2, s4, s8, s10, s20, s40, 0) = (1, 0, 0, 1, 1, 0, 0, 0) Seiko Instruments Inc. 13 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 2. Status register 1 Status register 1 is a 1-byte register that is used to display and set various modes. The bit configuration is shown below. B7 RESET W B6 B5 SC0 R/W B4 SC1 R/W B3 INT1 R R: W: R/W: B2 INT2 R B1 BLD R B0 POC R 12 / 24 R/W Read Write Read/Write Figure 13 Status Register 1 B0 : POC This flag is used to confirm whether the power is on. The power-on detector operates at power-on and B0 is set to “1”. This flag is Read-only. Once it is read, it is automatically set to “0”. When this flag is “1”, be sure to initialize. Regarding the operation after power-on, refer to “ Power-on Detection Circuit and Register Status”. B1 : BLD This flag is set to “1” when the power supply voltage decreases to the level of detection voltage (VDET) or less. Users can detect a drop in the power supply voltage. This flag is set to “1” once, is not set to “0” again even if the power supply increases to the level of detection voltage (VDET) or more. This flag is Read-only. When this flag is “1”, be sure to initialize. Regarding the operation of the power supply voltage detection circuit, refer to “ Low Power Supply Detection Circuit”. B2, B3 : INT2, INT1 This flag indicates the time set by alarm and when the time has reached it. This flag is set to “1” when the time that users set by using the alarm interrupt function has come. The INT1 flag in “1” at alarm 1 interrupt mode, the INT2 flag in “1” at alarm 2 interrupt mode. This flag is Read-only. This flag is read once, is set to “0” automatically. B4, B5 : SC1, SC0 These are 2-bit SRAM type registers that can be freely set by users. B6 : 12 / 24 This flag is used to set 12-hour or 24-hour expression. 0 : 12-hour expression 1 : 24-hour expression B7 : RESET The internal IC is initialized by setting this bit to “1”. This bit is Write-only. It is always “0” when Read. When applying the power supply voltage to the IC, be sure to write “1” to this bit to initialize the circuit. Regarding each status of data after initialization, refer to “ Register Status After Initialization”. 14 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 3. Status register 2 Status register 2 is a 1-byte register that is used to display and set various modes. The bit configuration is shown below. B7 I NT1FE R/W B6 B5 INT1AE R/W B4 32kE R/W B3 INT2FE B2 INT2ME R/W B1 INT2AE B0 TEST INT1ME R/W R/W R/W R/W R/W: Read/Write Figure 14 Status Register 2 B0 : TEST This is a test flag for SII. Be sure to set this flag to “0” in use. If this flag is set to “1”, be sure to initialize to set “0”. B1 : INT2AE, B2 : INT2ME, B3 : INT2FE These bits are used to select the output mode for the INT2 pin. Table 10 shows how to select the mode. To use an alarm 2 interrupt, set alarm interrupt mode, then access the INT2 register and the alarm expansion register 2. Table 10 Output Modes for INT2 Pin INT2AE INT2ME INT2FE INT2 Pin Output Mode No interrupt Output of user-set frequency Per-minute edge interrupt Minute-periodical interrupt 1 (50% duty) Alarm 2 interrupt *1. 0 0 0 *1 − 0 1 −*1 1 0 *1 − 1 1 1 0 0 Don’t care (Both of 0 and 1 are acceptable). B4 : 32kE, B5 : INT1AE, B6 : INT1ME, B7 : INT1FE These bits are used to select the output mode for the INT 1 pin. Table 11 shows how to select the mode. To use an alarm 1 interrupt, set alarm interrupt mode, then access the INT1 register and the alarm expansion register 1. Table 11 Output Modes for INT1 Pin 32kE INT1AE INT1ME INT1FE *1. 0 0 0 −*1 0 0 −*1 0 1 0 0 1 0 1 0 0 1 1 −*1 −*1 1 Don’t care (Both of 0 and 1 are acceptable). 0 1 0 1 0 1 −*1 INT 1 Pin Output Mode No interrupt Output of user-set frequency Per-minute edge interrupt Minute-periodical interrupt 1 (50% duty) Alarm 1 interrupt Minute-periodical interrupt 2 32.768 kHz output Seiko Instruments Inc. 15 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 4. INT1 register and INT2 register The INT1 and INT2 registers are to set up the output of user-set frequency, or to set up alarm interrupt. Users are able to switch the output mode by using the status register 2. If selecting to use the output mode for alarm interrupt by status register 2; this register works as the alarm-time data register. If selecting the output of user-set frequency by status register 2; this register works as the data register to set the frequency for clock output. From each INT1 and INT2 pin, a clock pulse and alarm interrupt are output. (1) Alarm interrupt Users can set the alarm time (the data of day of the week, hour, minute) by using the INT1 and INT2 registers which are 3-byte data registers. The configuration of register is as well as the data register of day of the week, hour, minute, in the real-time data register; is expressed by the BCD code. Do not set a nonexistent day. Users are necessary to set up the alarm-time data according to the 12/24 hour expression that they set by using the status register 1. INT1 register W1 B7 W2 W4 0 0 0 0 A1WE B0 M/ H10 H20 APM A1HE B0 INT2 register W1 B7 W2 W4 0 0 0 0 A2WE B0 M/ H10 H20 APM A2HE B0 H1 B7 H2 H4 H8 H1 B7 H2 H4 H8 m1 B7 m2 m4 m8 m10 m20 m40 A1mE B0 m1 B7 m2 m4 m8 m10 m20 m40 A2mE B0 Figure 15 INT1 Register and INT2 Register (Alarm Time-Data) The INT1 register has A1WE, A1HE, A1mE at B0 in each byte. It is possible to make data valid; the data of day of the week, hour, minute which are in the corresponded byte; by setting these bits to “1”. This is as well in A2WE, A2HE, A2mE in the INT2 register. Regarding set-up of year, month, day, refer to “9. Alarm expansion register 1 and alarm expansion register 2”. Setting example: alarm time “7:00 pm” in the INT1 register (a) 12-hour expression (status register 1 B6 = 0) set up 7:00 PM Data written to INT1 register −*1 −*1 −*1 −*1 −*1 Day of week Hour 1 1 1 0 0 Minute 0 0 0 0 0 B7 *1. Don’t care (Both of 0 and 1 are acceptable). (b) 24-hour expression (status register 1 B6 = 1) −*1 0 0 −*1 1 0 0 1 1 B0 set up 19:00 PM Data written to INT1 register −*1 −*1 −*1 −*1 −*1 −*1 Day of week Hour 1 0 0 1 1 0 Minute 0 0 0 0 0 0 B7 *1. Don’t care (Both of 0 and 1 are acceptable). *2. Set up the AM / PM flag along with the time setting. −*1 1*2 0 0 1 1 B0 16 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 (2) Output of user-set frequency The INT1 and INT2 registers are 1-byte data registers to set up the output frequency. Setting each bit B7 to B3 in the register to “1”, the frequency which corresponds to the bit is output in the AND-form. SC2 to SC4 in the INT1 register, and SC5 to SC7 in the INT2 register are 3-bit SRAM type registers that can be freely set by users. B7 1 Hz B6 2 Hz B5 4 Hz R/W B4 8 Hz R/W B3 16 Hz B2 SC2 R/W B1 SC3 B0 SC4 R/ W R/ W R/W R/ W R/W R/W: Read/Write Figure 16 INT1 Register (Data register for output frequency) B7 1 Hz B6 2 Hz B5 4 Hz R/W B4 8 Hz R/W B3 16 Hz B2 SC5 R/W B1 SC6 B0 SC7 R/W R/W R/W R/W R/W R /W: Read/Write Figure 17 INT2 Register (Data register for output frequency) Example: B7 to B3 = 50h 16 Hz 8 Hz 4 Hz 2 Hz 1 Hz INT1 pin or INT2 pin output Status register 2 • Set to INT1FE or INT2FE = 1 Figure 18 Example of output from INT1 register (Data register for output frequency) Seiko Instruments Inc. 17 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 5. Clock-correction register The clock-correction register is a 1-byte register that is used to correct advance/delay of the clock. When not using this function, set this register to “00h”. Regarding the register values, refer to “ Function to Clock-Correction”. B7 V0 R/W B6 V1 R/W B5 V2 R/W B4 V3 R/W B3 V4 R/W B2 V5 R/W B1 V6 R/W B0 V7 R/W R /W: Read/Write Figure 19 Clock-Correction Register 6. Free register The free register is a 1-byte SRAM type register that can be set freely by users. B7 F0 R/W B6 F1 R/W B5 F2 R/W B4 F3 R/W B3 F4 R/W B2 F5 R/W B1 F6 R/W B0 F7 R/W R/W: Read/Write Figure 20 Free Register 18 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 7. Up counter The up counter is a 24-bit Read-only register. It starts binary counting from “000000h” from power-on and continues counting as long as power is being applied. It continues counting when initialization, instead of returning to “000000h”. At power-on, registers are cleared by the power-on detector so that the up counter is cleared to “000000h”. If the power-on detector does not operate successfully, the counter may start from the indefinite status. For successful operation of the power-on detector, refer to “ Power-on Detection Circuit and Register Status”. Regarding the operation timing of the up counter, refer to “ Up-Count Operation”. C 6 4k C12 8k C256k C51 2k C1 M C2M C4M C8 M B7 B0 C 2 56 C51 2 C1k C 2k C4k C8 k C16k C3 2k B7 B0 C1 C2 C4 C8 C16 C32 C64 C 128 B7 Figure 21 Up Counter B0 Table 12 Example of Count Value and Read Data in Register Count Value 000001h 000002h • • • EFFFFFh • • • FFFFFFh Read data in register 000080h 000040h • • • F7FFFFh • • • FFFFFFh Seiko Instruments Inc. 19 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 8. FOUT setting register 1 and FOUT setting register 2 FOUT setting register 1 and 2 are 1-byte data registers to set up the output frequency for the FOUT pin. As well as the function output of user-set frequency, in the INT1 (INT2) register, by setting each bit in the register to “1”, the frequency, which corresponds to the bit, is output in the AND-form. Figure 24 shows the setting example. At power-on, the FOUT setting register 1 and 2 are set to “00h” so that no clock pulses are output. The value of output voltage is defined by VDDL. B7 256 Hz B6 512 Hz B5 1 kHz R/W B4 2 kHz R/W B3 4 k Hz B2 8 k Hz R/W B1 16 kHz B0 32 kHz R/W R/W R/W R/W R/W R/W: Read/Write Figure 22 FOUT Setting Register 1 B7 1 Hz B6 2 Hz B5 4 Hz R/W B4 8 Hz R/W B3 16 Hz B2 32 Hz R/W B1 64 Hz B0 128 Hz R/W R/W R/W R/W R/W R/W: Read/Write Figure 23 FOUT Setting Register 2 Setting example: FOUT setting register 1 : B7 to B0 = 80h, FOUT setting register 2 : B7 to B0 = 05h 256 Hz 128 Hz 64 Hz 32Hz *1 FOUT pin *1 *1 Set data in FOUT setting register 1 and FOUT setting register 2 *1. The value of output voltage is defined by VDDL. Set VDDL ≤ VDD. Figure 24 Example of output of clock pulse 20 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 9. Alarm expansion register 1 and alarm expansion register 2 The alarm expansion register 1 and 2 are 3-byte registers. They are expansion registers for the INT1 and INT2 registers which output alarm interrupt. Users are able to set the alarm time; the data of year, month, day. The configuration of register is expressed by BCD code as well as the data register of year, month, day in the real-time register. Alarm expansion register 1 Y1 B7 Y2 Y4 Y8 Y10 Y20 Y40 Y80 B0 Alarm expansion register 2 Y1 B7 Y2 Y4 Y8 Y10 Y20 Y40 Y80 B0 M1 B7 M2 M4 M8 M10 0 A1YE A1ME B0 M1 B7 M2 M4 M8 M10 0 A2YE A2ME B0 D1 B7 D2 D4 D8 D10 D20 0 A1DE B0 D1 B7 D2 D4 D8 D10 D20 0 A2DE B0 Figure 25 Alarm Expansion Register 1 and Alarm Expansion Register 2 To make the year data of alarm expansion register 1 valid, set A1YE to “1”. For the month data, set A1ME to “1”, for the day data, set A1DE to “1”. Set as well A2ME, A2YE, A2DE in the alarm expansion register 2. Regarding how to set the data of day of the week, hour, and minute, refer to “(1) Alarm interrupt” in “4. INT1 register and INT2 register”. Setting example: Setting alarm time “January 31, 2015” in the alarm expansion register 1 Data written to the alarm expansion register 1 Year 1 0 1 0 1 0 *1 − Month 1 0 0 0 0 Day 1 0 0 0 1 1 B7 *1. Don’t care (Both of 0 and 1 are acceptable.) 0 1 −*1 0 1 1 B0 Seiko Instruments Inc. 21 2-WIRE REAL-TIME CLOCK S-35399A02 Power-on Detector and Register Status Rev.1.0_00 The power-on detection circuit operates by power-on the S-35399A02, as a result each register is cleared; each register is set as follows. Real-time data register : Status register 1 : Status register 2 : INT1 register : INT2 register : Clock correction register : Free register : Up counter : FOUT setting register 1 : FOUT setting register 2 : Alarm expansion register 1 : Alarm expansion register 2 : 00 (Y), 01 (M), 01 (D), 0 (day of the week), 00 (H), 00 (M), 00 (S) “01h” “01h” “80h” “00h” “00h” “00h” “00 00 00h” “00h” “00h” “00h” “00h” “1” is set in the POC flag (B0 in the status register 1) to indicate that power has been applied. To correct the oscillation frequency, the status register 2 goes in the mode the output of user-set frequency, so that 1 Hz clock pulse is output from the INT1 pin. When “1” is set in the POC flag, be sure to initialize. The POC flag is set to “0” due to initialization so that the output of user-set frequency mode is cleared. (Refer to “ Register Status After Initialization”.) For the regular operation of power-on detection circuit, the period to power-up the S-35399A02 is that the voltage reaches 1.3 V within 10 ms after setting the IC’s power supply voltage at 0 V. When the power-on detection circuit is not working normally is; the POC flag (B0 in the status register) is not in “1”, or 1 Hz is not output from the INT1 pin. In this case, power-on the S-35399A02 once again because the internal data may be in the indefinite status. Do not transmit data immediately after power-on at least one sec because the power-on detection circuit is operating. Within 10 ms 1.3 V 0V *1 *1. 0 V indicates that there are no potential differences between the VDD pin and VSS pin of the S-35399A02. Figure 26 How to raise the power supply voltage 22 Seiko Instruments Inc. Rev.1.0_00 Register Statuses After Initialization The status of each register after initialization is as follows. Real-time data register : Status register 1 : 2-WIRE REAL-TIME CLOCK S-35399A02 Status register 2 : INT1 register : INT2 register : Clock correction register : Free register : Up counter : FOUT setting register 1 : FOUT setting register 2 : Alarm expansion register 1 : Alarm expansion register 2 : 00 (Y), 01 (M), 01 (D), 0 (day of the week), 00 (H), 00 (M), 00 (S) “0 B6 B5 B4 0 0 0 0 b” (In B6, B5, B4, the data of B6, B5, B6 in the status register 1 at initialization is set. Refer to Figure 27.) “00h” “00h” “00h” “00h” “00h” Is not initialized and continues counting. “00h” “00h” “00h” “00h” Write to status register 1 1 9 18 1 Read from status register 1 9 18 SCL R/W ACK START START STOP ACK R/W NO_ACK ACK STOP 0 0 110000 1 L LH LL L L L 0 SDA 0 11 0 0000 10100000 Code + command B7 B5 Write “1” to reset flag and SC0. : Output from S-35399A02 : Input from master device Code + command B7 B5 : Not reset Figure 27 Data of Status Register 1 at Initialization Seiko Instruments Inc. 23 2-WIRE REAL-TIME CLOCK S-35399A02 Low Power Supply Voltage Detection Circuit Rev.1.0_00 The S-35399A02 has a low power supply voltage detection circuit, so that users can monitor drops in the power supply voltage by reading the BLD flag (B1 in the status register 1). There is a hysteresis width of approx. 0.15 V (Typ.) between detection voltage and release voltage (refer to “ Characteristics (Typical Data)”). The low power supply voltage detection circuit does the sampling operation only once in one sec for 15.6 ms. If the power supply voltage decreases to the level of detection voltage (VDET) or less, “1” is set to the BLD flag so that sampling operation stops. Once “1” is detected in the BLD flag, no sampling operation is performed even if the power supply voltage increases to the level of release voltage or more, and “1” is held in the BLD flag. After initialization, or once the BLD flag is read, the BLD flag is automatically set to “0” to restart the sampling operation. If the BLD flag is “1” even after the power supply voltage is recovered, the internal circuit may be in the indefinite status. In this case, be sure to initialize the circuit. VDD Detection voltage BLD flag reading 1s 1s Hysteresis width 0.15 V approximately Release voltage Sampling pulse 15.6 ms Stop Stop Stop BLD flag Figure 28 Timing of Low Power Supply Voltage Detection Circuit Circuits Power-on and Low Power Supply Voltage Detection Figure 29 shows the changes of the POC flag and BLD flag due to VDD fluctuation. VDD Low power supply voltage detection voltage Low power supply voltage detection voltage VSS POC flag BLD flag Status register 1 reading Figure 29 POC Flag and BLD Flag 24 Seiko Instruments Inc. Rev.1.0_00 Correction of Nonexistent Data and End-of-Month 2-WIRE REAL-TIME CLOCK S-35399A02 When users write the real-time data, the S-35399A02 checks it. In case that the data is invalid, the S-35399A02 does the following procedures. 1. Processing of nonexistent data Table 13 Register Year data Month data Day data Day of week data 24-hour Hour data *1 12-hour Minute data Second data *2 Normal Data 00 to 99 01 to 12 01 to 31 0 to 6 0 to 23 0 to 11 00 to 59 00 to 59 Processing of Nonexistent Data Nonexistent Data XA to XF, AX to FX 00, 13 to 19, XA to XF 00, 32 to 39, XA to XF 7 24 to 29, 3X, XA to XF 12 to 19, 2X, 3X, XA to XF 60 to 79, XA to XF 60 to 79, XA to XF Result 00 01 01 0 00 00 00 00 *1. In a 12-hour expression, Write the AM / PM flag (B1 in hour data in the real-time data register). In 24-hour expression, the AM / PM flag in the real-time data register is omitted. However in the flag in Read, users are able to read 0; 0 to 11, 1; 12 to 23. *2. Processing of nonexistent data, regarding second data, is done by a carry pulse which is generated one sec after, after Write. At this point the carry pulse is sent to the minute-counter. 2. Correction of end-of-month A nonexistent day, such as February 30 and April 31, is set to the first day of the next month. Seiko Instruments Inc. 25 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 INT1 , INT2 Pin Output Modes These are selectable for the output mode for INT1 and INT2 pins; Alarm interrupt, the output of user-set frequency, per-minute edge interrupt output, minute-periodical interrupt output 1. In the INT1 pin output mode, in addition to the above modes, minute-periodical interrupt output 2 and 32.768 kHz output are also selectable. To swith the output mode, use the status register 2. Refer to “3. status register 2” in “ Configuration of Register”. When switching the output mode, be careful of the output status of the pin. Especially, when using alarm interrupt/output of frequency, switch the output mode after setting “00h” in the INT1/INT2 register. In 32.768 kHz output/per-minute edge interrupt output/minute-periodical interrupt output, it is unnecessary to set data in the INT1/INT2 register for users. Refer to the followings regarding each operation of output modes. 1. Alarm interrupt output Alarm interrupt output is the function to output “L” from the INT1 / INT2 pin, at the alarm time which is set by user has come. If setting the pin output to “H”, turn off the alarm function by setting “0” in INT1AE/INT2AE in the status register 2. To set the alarm time, set the data of day of the week, hour, minute in the INT1/INT2 register, set the data of year, month, day in the alarm expansion register 1 or 2. Refer to “4. INT1 register and INT2 register” and “9. Alarm expansion register 1 and alarm expansion register 2” in “ Configuration of Register”. Alarm setting of “Y (year), M (month), D (day), W (day of week), H (hour), m (minute)” Status register 2 setting • INT1 pin output mode 32kE = 0, INT1ME = INT1FE = 0 • INT2 pin output mode INT2ME = INT2FE = 0 INT1 register INT2 register mx Hx Wx INTx register alarm enable flag • AxHE = AxmE = AxWE = "1" Alarm expansion register x alarm enable flag • AxYE = AxME = AxDE = "1" Alarm expansion register 1 Alarm expansion register 2 Dx Mx Yx Comparator Alarm interrupt Second Minute Hour Real-time data Y (year), M (month), D (day), W (day of week) Real-time data H h (m − 1) m 59 s Change by program INT1AE/INT2AE Week Day Month Year H h 00m 00 s 01 s 59 s H h (m + 1) m 00 s Change by program Change by program *1 Alarm time matches INT1 pin/INT2 pin OFF Period when alarm time matches *1. If users clear INT1AE/INT2AE once; “L” is not output from the INT1 / INT2 pin by setting INT1AE/INT2AE enable again, within a period when the alarm time matches real-time data. Figure 30 Alarm Interrupt Output Timing (1/2) 26 Seiko Instruments Inc. Rev.1.0_00 Alarm setting of “H (hour)” Status register 2 setting • INT1 pin output mode 32kE = 0, INT1ME = INT1FE = 0 • INT2 pin output mode INT2ME = INT2FE = 0 INT1 register INT2 register mx Hx Wx 2-WIRE REAL-TIME CLOCK S-35399A02 INTx register alarm enable flag • AxHE = AxmE = AxWE = "1" Alarm expansion register x alarm enable flag • AxYE = AxME = AxDE = "1" Alarm expansion register 1 Alarm expansion register 2 Dx Mx Yx Comparator Alarm interrupt Second Minute Hour Real-time data Week Day Month Year Real-time data (H − 1) h 59 m 59 s Change by program H h 00 m 00 s 01 s 59 s H h 01 m 00 s H h 59 m 59 s Change by program (H + 1) h 00 m 00 s Change by program Change by program INT1AE/INT2AE *1 Alarm time matches INT1 pin/INT2 pin OFF Alarm time matches*2 OFF *1 Period when alarm time matches *1. If users clear INT1AE/INT2AE once; “L” is not output from the INT1 / INT2 pin by setting INT1AE/INT2AE enable again, within a period when the alarm time matches real-time data. *2. If turning the alarm output on by changing the program, within the period when the alarm time matches real-time data, “L” is output again from the INT1 / INT2 pin when the minute is counted up. Figure 31 Alarm Interrupt Output Timing (2/2) 2. Output of user-set frequency The output of user-set frequency is the function to output the frequency which is selected by using data, from the INT1 / INT 2 pin, in the AND-form. Set up the data of frequency in the INT1/INT2 register. Refer to “4. INT1 register and INT2 register” in “ Configuration of Register”. Status register 2 setting • INT1 pin output mode 32kE = 0, INT1AE = Don’t care (0 or 1), INT1ME = 0 • INT2 pin output mode INT2AE = Don’t care (0 or 1), INT2ME = 0 Change by program INT1FE/INT2FE Free-run output starts OFF INT1 pin/INT2 pin Figure 32 Output Timing of User-set Frequency Seiko Instruments Inc. 27 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 3. Per-minute edge interrupt output Per-minute edge interrupt output is the function to output “L” from the INT 1 / INT2 pin, when the first minute-carry processing is done, after selecting the output mode. To set the pin output to “H”, turn off the output mode of per-minute edge interrupt. In the INT 1 pin output mode, input “0” in INT1ME in the status register 2. In the INT2 pin output mode, input “0” in INT2ME. Status register 2 setting • INT1 pin output mode 32kE = 0, INT1AE = Don’t care (0 or 1), INT1FE = 0 • INT2 pin output mode INT2AE = Don’t care (0 or 1), INT2FE = 0 Change by program INT1ME/INT2ME Minute-carry processing OFF Minute-carry processing INT1 pin/INT2 pin "L" is output again if this period is within 7.9 ms*1. *1. Pin output is set to “H” by disabling the output mode within 7.9 ms, because the signal of this procedure is maintained for 7.9 ms. Note that pin output is set to “L” by setting enable the output mode again. Figure 33 Timing of Per-Minute Edge Interrupt Output 4. Minute-periodical interrupt output 1 The minute-periodical interrupt 1 is the function to output the one-minute clock pulse (Duty 50%) from the INT 1 / INT2 pin, when the first minute-carry processing is done, after selecting the output mode. Status register 2 setting • INT1 pin output mode 32kE = 0, INT1AE = 0 • INT2 pin output mode INT2AE = 0 INT1ME, INT1FE INT2ME, INT2FE Minute-carry processing INT1 pin/INT2 pin 30 s 30 s 30 s 30 s 30 s 30 s 30 s 30 s 30 s Minute-carry processing Minute-carry processing Minute-carry processing Minute-carry processing Change by program (OFF) "L" is output again if this period is within 7.9 ms*1. "H" is output again if this period is within 7.9 ms. "L" is output at the next minute-carry processing *1. Setting the output mode disable makes the pin output “H”, while the output from the INT 1 / INT2 pin is in “L”. Note that pin output is set to “L” by setting enable the output mode again. Figure 34 Timing of Minute-periodical Interrupt Output 1 28 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 5. Minute-periodical interrupt output 2 (only in the INT1 pin output mode) The output of minute-periodical interrupt 2 is the function to output “L”, for 7.9 ms, from the INT 1 pin, synchronizing with the first minute-carry processing after selecting the output mode. However, in Read in the real-time data register, the procedure delays at max. 0.5 sec thus output “L” from the INT 1 pin also delays at max. 0.5 sec. In Write in the real-time data register, some delay is made in the output period due to Write timing and the second-data during Write. (a) During normal operation Minute-carry processing Minute-carry processing Minute-carry processing INT1 pin 7.9 ms 60 s 7.9 ms 60 s 7.9 ms (b) During real-time data read (Normal minutecarry processing) Minute-carry processing Minute-carry processing Minute-carry processing INT1 pin 7.9 ms 0.5 s Max. 60 s 7.9 ms 60 s 7.9 ms Serial communication Real-time data read command Real-time Real-time data Real-time data reading read command data reading (c) During real-time data write Minute-carry processing Minute-carry processing Minute-carry processing INT1 pin 7.9 ms 55 s 45 s Real-time data write timing Second data of writing: "50" s The output period is shorter. Second data of writing: "10" s The output period is longer. 7.9 ms 10 s 30 s 7.9 ms 80 s 50 s Figure 35 Timing of Minute-periodical Interrupt Output 2 Seiko Instruments Inc. 29 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 6. Operation of power-on detection circuit (only in the INT1 pin output mode) When power is applied to the S-35399A02, the power-on detection operates to set “1” in the POC flag (B0 in the status register 1). A 1 Hz clock pulse is output from the INT 1 pin. Status register 2 setting • 32kE = 0, INT1AE = INT1ME = 0 INT1FE OFF INT1 pin Change by reset command 0.5 s 0.5 s Figure 36 Output Timing of INT 1 Pin during Operation of Power-on Detection Circuit Function to Clock-Correction The function to clock-correction is to correct advance/delay of the clock due to the deviation of oscillation frequency, in order to make a high precise clock. For correction, the S-35399A02 adjusts the clock pulse by using a certain part of the dividing circuit, not adjusting the frequency of the crystal oscillator. Correction is performed once every 20 seconds (or 60 seconds). The minimum resolution is approx. 3 ppm (or approx. 1 ppm) and the S-35399A02 corrects in the range of −195.3 to +192.2 ppm (or of −65.1 to +64.1 ppm). (Refer to Table 14.) Users can set up this function by using the clock-correction register. Regarding how to calculate the setting data, refer to “1. How to calculate”. When not using this function, be sure to set “00h”. Table 14 Function to Clock-Correction Correction Minimum resolution Correction range B0 = 0 Every 20 seconds 3.052 ppm −195.3 to +192.2 ppm B0 = 1 Every 60 seconds 1.017 ppm −65.1 to +64.1 ppm 30 Seiko Instruments Inc. Rev.1.0_00 1. How to calculate (1) 2-WIRE REAL-TIME CLOCK S-35399A02 If current oscillation frequency > target frequency (in case the clock is fast) (Current oscillation frequency *3 *2 actual measurement value ) − (Target oscillation frequency ) (Current oscillation frequency *2 actual measurement value ) × (Minimum resolution ) *4 Correction value = 128 − Integral value *1 Caution The figure range which can be corrected is that the calculated value is from 0 to 64. *1. Convert this value to be set in the clock correction register. example 1”. For how to convert, refer to “(a) Calculation *2. Measurement value when 1 Hz clock pulse is output from the INT 1 / INT2 pin. *3. Target value of average frequency when the clock correction function is used. *4. Refer to Table 14. (a) Calculation example 1 In case of current oscillation frequency actual measurement value = 1.000070 [Hz], target oscillation frequency = 1.000000 [Hz], B7 = 0 (Minimum resolution = 3.052 ppm) (1.000070) − (1.000000)  Correction value = 128 − Integral value   (1.000070) × (3.052 × 10−6)  = 128 − Integral value (22.93)= 128 − 22 = 106 Convert the correction value “106” to 7-bit binary and obtain “1101010b”. Reverse the correction value “1101010b” and set it to B6 to B0 of the clock correction register. Thus, set the clock correction register: (B7, B6, B5, B4, B3, B2, B1, B0) = (0, 1, 0, 1, 0, 1, 1, 0) (2) If current oscillation frequency < target frequency (in case the clock is slow) (Target oscillation frequency) − Correction value = Integral value (Current oscillation frequency actual measurement value) (Minimum resolution) (Current oscillation frequency × actual measurement value) +1 Caution The figure range which can be corrected is that the calculated value is from 0 to 62. (a) Calculation example 2 In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency = 1.000000 [Hz]. B7 = 0 (Minimum resolution = 3.052 ppm) (1.000000) − (0.999920)  +1 Correction value = Integral value  0.999920) × (3.052 × 10-6)  ( = Integral value (26.21) + 1 = 26 + 1 = 27 Thus, set the clock correction register: (B7, B6, B5, B4, B3, B2, B1, B0) = (1, 1, 0, 1, 1, 0, 0, 0) (b) Calculation example 3 In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency = 1.000000 [Hz], B7 = 1 (Minimum resolution = 1.017 ppm) (1.000000) − (0.999920)  +1 Correction value = Integral value   (0.999920) × (1.017 × 10-6)  = Integral value (78.66) + 1 Thus, this calculated value exceeds the correctable range 0 to 62, B7 = “1” (minimum resolution = 1.017 ppm) indicates the correction is impossible. Seiko Instruments Inc. 31 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 2. Setting value for register and correction value Table 15 Setting Value for Register and Correction Value (Minimum Resolution: 3.052 ppm (B0 = 0)) B7 1 0 1 B6 1 1 0 B5 1 1 1 B4 1 1 1 B3 1 1 1 • • • 0 0 0 1 1 1 • • • 0 0 0 B2 1 1 1 B1 0 0 0 B0 0 0 0 0 1 0 1 0 1 1 0 0 1 1 0 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 Correction Value [ppm] 192.3 189.2 186.2 • • • 6.1 3.1 0 −3.1 −6.1 −9.2 • • • −189.2 −192.3 −195.3 Rate [s/day] 16.61 16.35 16.09 • • • 0.53 0.26 0 −0.26 −0.53 −0.79 • • • −16.35 −16.61 −16.88 Table 16 Setting Value for Register and Correction Value (Minimum Resolution: 1.017 ppm (B0 = 1)) B7 1 0 1 B6 1 1 0 B5 1 1 1 B4 1 1 1 B3 1 1 1 • • • 0 0 0 1 1 1 • • • 0 0 0 B2 1 1 1 B1 0 0 0 B0 1 1 1 0 1 0 1 0 1 1 0 0 1 1 0 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 1 1 1 1 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 Correction Value [ppm] 64.1 63.1 62.0 • • • 2.0 1.0 0 −1.0 −2.0 −3.0 • • • −63.1 −64.1 −65.1 Rate [s/day] 5.54 5.45 5.36 • • • 0.18 0.09 0 −0.09 −0.18 −0.26 • • • −5.45 −5.54 −5.62 32 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 3. How to confirm setting value for register and result of correction The S-35399A02 does not adjust the frequency of the crystal oscillation by using the clock-correction function. Therefore users cannot confirm if it is corrected or not by measuring output 32.768 kHz. When the function to clock-correction is being used, the cycle of 1 Hz clock pulse output from the INT 1 pin changes once in 20 times or 60 times, as shown in Figure 37. INT1 pin (1 Hz output) a a 19 times or 59 times a b Once a B0 = 0, a : 19 times, b : Once B0 = 1, a : 59 times, b : Once Figure 37 Confirmation of Correction Result Measure a and b by using the frequency counter*1. Calculate the average frequency (Tave) based on the measurement results. B0 = 0, Tave = (a × 19 + b) ÷ 20 B0 = 1, Tave = (a × 59 + b) ÷ 60 Calculate the error of the clock based on the average frequency (Tave). The following shows an example for confirmation. Confirmation example: When B0 =0, 66h is set Measurement results: a = 1.000080 Hz, b = 0.998493 Hz Clock Correction Register Setting Value Average Frequency [Hz] Before correction 00 h (Tave = a) 1.000080 After correction 66 h (Tave = (a × 19 + b) ÷ 20) 1.00000065 Calculating the average frequency allows to confirm the result of correction. Per Day [s] 86393 86399.9 *1. Use a high-accuracy frequency counter of 7 digits or more. Caution 1. Clock pulse output from the FOUT pin is not corrected. 2. Measure the oscillation frequency under the usage conditions. Seiko Instruments Inc. 33 2-WIRE REAL-TIME CLOCK S-35399A02 32.768 kHz Output Pins Rev.1.0_00 The S-35399A02 outputs a 32.768 kHz clock pulse from the INT 1 , F32K, and FOUT pins. However, do not output 32.768 kHz from these three pins simultaneously because stability of the crystal oscillator is affected. When using the function to clock-correction or adjusting the oscillation frequency, measure the oscillation frequency under the usage conditions. For example, when using 32.768 kHz clock pulse which is output from the FOUT pin, measure this IC while the pulse is being output from the pin. Timing of Clock Output from F32K Pin The 32.768 kHz clock pulse of the oscillation frequency is output from the F32K pin. The F32K pin has an Nch open-drain output. When the CTRL pin is in “H”, the clock pulse is output, and when the CTRL pin is in “L” or open, the F32K pin is in high impedance. To output 32.768 kHz from the F32K pin, set the CTRL pin to “H” when one sec or more has elapsed after power-on. CTRL pin ON F32K pin OFF Figure 38 Timing of Clock Output from F32K Pin Up-Count Operation The up counter is a 24-bit read-only binary counter. This counter starts counting from “000000h” from power-on and returns to “000000h” at the next clock after it has reached “FFFFFFh”. A clock pulse is a pulse that is output when the second-data in the real-time data is “00h”. Therefore, some delay is made in the period that a clock pulse is being output due to Write timing and Write data. The registers are not initialized unless power-on again, so that users are able to grasp the elapsed time from power-on up to 30 years. Figure 39 shows the example of timing chart of up counter’s operation. ON Power supply OFF Write real-time second data: 20 seconds Write real-time second data: 50 seconds OFF Clock pulse of real-time second data "00h" 24-bit binary up counter 40 s 40 s 60 s 20 s 10 s 60 s FFFFFF h 60 s 000000 h 000001 h 000000 h 000001 h 000010 h A clock pulse is 60 seconds or more. A clock pulse is 60 seconds or less. Figure 39 Timing Chart of 24-Bit Binary Up Counter 34 Seiko Instruments Inc. Rev.1.0_00 Serial Interface 2-WIRE REAL-TIME CLOCK S-35399A02 The S-35399A02 receives various commands via I2C-bus serial interface to Read/Write data. Regarding transmission is as follows. 1. Start condition A start condition is when the SDA line changes “H” to “L” when the SCL line is in “H”, so that the access starts. 2. Stop condition A stop condition is when the SDA line changes “L” to “H” when the SCL line is in “H”, and the access stops, so that the S-35399A02 gets standby. tSU.STA tHD.STA tSU.STO SCL SDA Start condition Figure 40 Start/Stop Conditions Stop condition 3. Data transmission and acknowledgment signal Data transmission is performed for every 1-byte, after detecting a start condition. Transmit data while the SCL line is in “L”, and be careful of spec of tSU.DAT and tHD. DAT when changing the SDA line. If the SDA line changes while the SCL line is in “H”, the data will be recognized as start/stop condition in spite of data transmission. Note that by this case, the access will be interrupted. During data transmission, every moment receiving 1-byte data, the devices which work for receiving data send an acknowledgment signal back. For example, as seen in Figure 41, in case that the S-35399A02 is the device working for receiving data and the master device is the one working for sending data; when the 8-bit clock pulse falls, the master device releases the SDA line. After that, the S-35399A02 sends an acknowledgment signal back, and set the SDA line to “L” at the 9-bit clock pulse. The S-35399A02 does not output an acknowledgment signal is that the access is not being done regularly. SCL (Input from S-35399A02) tSU.DAT SDA (Output from master device) SDA (Output from S-35399A02) 1 tHD.DAT 8 9 SDA is released High-Z Output acknowledgment (“L” active) Start condition High-Z tPD Figure 41 Output Timing of Acknowledgment Signal Seiko Instruments Inc. 35 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 The followings are Read/Write in the S-35399A02. (1) Data Read in S-35399A02 After detecting a start condition, the S-35399A02 receives device code and command. The S-35399A02 enters the Read-data mode by the Read/Write bit “1”. The data is output from B7 in 1-byte. Input an acknowledgment signal from the master device every moment that the S-35399A02 outputs 1-byte data. However, do not input an acknowledgment signal (input NO_ACK) for the last data-byte output from the master device. This procedure notifies the completion of Read. Next, input a stop condition to the S-35399A02 to finish access. 1-byte data 1 9 18 SCL R/W NO_ACK START STOP ACK SDA 0 110 000 1 B7 B0 Code + command : Output from S-35399A02 : Input from master device Input NO_ACK after the 1st byte of data has been output. Figure 42 Example of Data Read 1 (1-Byte Data Register) 3-byte data 1 9 18 27 36 SCL R/W START STOP NO_ACK ACK ACK SDA 0 1100 1 11 ACK Code + command B7 B0 B7 B0 B7 B0 : Output from S-35399A02 : Input from master device Input NO_ACK after the 3rd byte of data has been output. Figure 43 Example of Data Read 2 (3-Byte Data Register) 36 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 (2) Data Write in S-35399A02 After detecting a start condition, S-35399A02 receives device code and command. The S-35399A02 enters the Write-data mode by the Read/Write bit “0”. Input data from B7 to B0 in 1-byte. The S-35399A02 outputs an acknowledgment signal (“L”) every moment that 1-byte data is input. After receiving the acknowledgment signal which is for the last byte-data, input a stop condition to the S-35399A02 to finish access. 1-byte data 1 9 18 SCL R/W START STOP ACK ACK SDA 0 110 000 0 B7 B0 Code + command : Output from S-35399A02 : Input from master device Figure 44 Example of Data Write 1 (1-Byte Data Register) 3-byte data 1 9 18 27 36 SCL R/W STOP ACK START ACK ACK ACK SDA 0 110 011 0 B7 B0 B7 B0 B7 B0 Code + command : Output from S-35399A02 : Input from master device Figure 45 Example of Data Read 2 (3-Byte Data Register) Seiko Instruments Inc. 37 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 4. Data access (1) Real-time data 1 access 1 9 18 63 72 SCL R/W STOP START ACK ACK ACK SDA 0 11 00 1 0 ACK*1 *2 *2 Code + command I/O mode switching B7 Year data B0 B7 B0 Second data I/O mode switching *1. Set NO_ACK = 1 in Read. *2. Transmit ACK = 0 from the master device to the S-35399A02 in Read. Figure 46 (2) Real-time data 2 access 1 9 18 27 36 Real-Time Data 1 Access SCL R/W START STOP ACK*2 ACK ACK*2 SDA 0 1100 11 ACK*1 Code + command I/O mode switching B7 Hour data B0 B7 B0 B7 B0 Minute data I/O mode switching Second data *1. *2. Set NO_ACK = 1 in Read. Transmit ACK = 0 from the master device to the S-35399A02 in Read. Figure 47 Real-Time Data 2 Access (3) Status register 1 access and status register 2 access 1 9 18 SCL *1 START R/W STOP ACK ACK*2 SDA 0 11000 Code + command I/O mode switching B7 B0 Status data I/O mode switching *1. *2. 0 : Status register 1 selected, 1 : Status register 2 selected Set NO_ACK = 1 in Read. Figure 48 Status Register 1 Access and Status Register 2 Access 38 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 (4) INT1 register access and INT2 register access In Read/Write the INT1 and INT2 registers, data varies depending on the setting of the status register 2. Be sure to Read/Write after setting the status register 2. When setting the alarm by using the status register 2, these registers work as 3-byte alarm time data registers, in other statuses, they work as 1-byte registers. When outputting the user-set frequency, they are the data registers to set up the frequency. Regarding details of each data, refer to “4. INT1 register and INT2 register” in “ Caution Configuration of Register”. Users cannot use both functions of alarm 1 interrupt for the INT1 pin and INT 2 pin and the output of user-set frequency simultaneously. 1 9 18 27 36 SCL *1 START R/W STOP ACK*3 ACK*2 ACK ACK*3 SDA 0 11010 Code + command I/O mode switching B7 B0 B7 Hour data B0 B7 B0 Day of week data Minute data I/O mode switching *1. *2. *3. 0 : INT1 register selected, 1 : INT2 register selected Set NO_ACK = 1 in Read. Transmit ACK = 0 from the master device to the S-35399A02 in Read. Figure 49 INT1 Register Access and INT2 Register Access 1 9 18 SCL *1 START R/W STOP ACK*2 ACK SDA 0 11010 Code + command I/O mode switching B7 B0 Frequency setting data I/O mode switching *1. *2. 0 : INT1 register selected, 1 : INT2 register selected Set NO_ACK = 1 in Read. Figure 50 INT1 Register and INT2 Register (Data Register for output frequency) Access Seiko Instruments Inc. 39 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 (5) Clock-correction register access 1 9 18 SCL R/W START STOP ACK*1 ACK SDA 0 110110 Code + command I/O mode switching B7 B0 Clock correction data I/O mode switching *1. Set NO_ACK = 1 in Read. Figure 51 Clock-Correction Register Access (6) Free register access 1 9 18 SCL R/W START STOP ACK*1 ACK SDA 0 110111 B7 B0 Code + command I/O mode switching Free register data I/O mode switching *1. Set NO_ACK = 1 in Read. Figure 52 Free Register Access (7) Up counter access Access to the up counter is Read-only. Users cannot Write in this counter with Write operation. 1 9 18 27 36 SCL Read only NO_ACK STOP ACK C8M C4M C2M C1M C512k C256k C128k C64k ACK C128 C64 C32 C16 C8 C4 C2 C1 ACK C32k C16k START SD A 0 11 1 0 00 1 Code + command B7 B0 B7 B0 Count data Count data I/O mode switching I/O mode switching Figure 53 Up Counter Access 40 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 (8) FOUT setting register 1 access and FOUT setting register 2 access 1 9 18 SCL *1 START R/W STOP ACK*2 ACK SDA 0 1110ab Code + command I/O mode switching B7 B0 FOUT setting data I/O mode switching *1 To select register, use the following settings. a 0 1 *2. Figure 54 (9) b 1 0 Register to select FOUT setting register 1 FOUT setting register 2 Set NO_ACK = 1 in Read. FOUT Setting Register 1 Access and FOUT Setting Register 2 Access Alarm expansion register 1 access and alarm expansion register 2 access Write in the alarm expansion register 1 (alarm expansion register 2) after setting the status register 2. 1 9 18 27 36 SCL *1 START R/W STOP ACK*3 ACK*2 ACK ACK*2 SDA 0 1111 0 Code + command I/O mode switching B7 Year data B0 B7 B0 B7 B0 Month data Second data I/O mode switching *1. 0 : Alarm expansion register 1 access, 1 : Alarm expansion register 2 access *2. Transmit ACK = 0 from the master device to the S-35399A02 in Read. *3. Set NO_ACK = 1 in Read. Figure 55 Alarm Expansion Register 1 Access and Alarm Expansion Register 2 Access Seiko Instruments Inc. 41 2-WIRE REAL-TIME CLOCK S-35399A02 Reset After Communication Interruption Rev.1.0_00 In case of communication interruption in the S-35399A02, for example, during communication the power supply voltage drops so that only the master device is reset; the S-35399A02 does not operate the next procedure because the internal circuit keeps the state prior to interruption. The S-35399A02 does not have a reset pin so that users usually reset its internal circuit by inputting a stop condition. However, if the SDA line is outputting “L” (during output of acknowledgment signal or Read), the S-35399A02 does not accept a stop condition from the master device. In this case, users are necessary to finish acknowledgment output or Read the SDA line. Figure 56 shows how to reset. First, input a start condition from the master device (The S-35399A02 cannot detect a start condition because the SDA line in the S-35399A02 is outputting “L”). Next, input a clock pulse equivalent to 1-byte data access (9-clock) from the SCL line. During this, release the SDA line for the master device. By this procedure, SDA I/O before interruption is finished, so that the SDA line in the S-35399A02 is released. After that, inputting a stop condition resets the internal circuit so that restore the regular communication. This reset procedure is recommended to perform at initialization of the system after rising the master device’s power supply voltage. Start condition SCL SDA (Output from master device) High-Z Stop condition Clock equivalent to 1-byte data access 1 2 8 9 SDA (Output from S-35399A02) “L” “L” or High-Z High-Z SDA “L” “L” or High-Z High-Z Figure 56 How to Reset 42 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 Flowchart of Initialization at Power-on and Example of Real-time Data Set-up Figure 57 shows the flowchart of initialization at power-on and an example of real-time data set-up. Regarding how to apply power, refer to “ Power-on Detection Circuit and Register Status”. It is unnecessary for users to comply with this flowchart of real-time data strictly. And if using the default data at initializing, it is also unnecessary to set up again. START Power-on Wait for 1 s Read status register 1 NO POC = 1 YES Initialize (status register 1 B7 = 1) Initialization after power-on Read status register 1 NO POC = 0 YES NO BLD = 0 YES Set 24-hour/12-hour display to status register 1 Read status register 1 NG Confirm data in status register 1 OK Set real-time data 1 Example of real-time data setting Read real-time data 1 Read status register 2 NO TEST = 0 YES END Figure 57 Example of Initialization Flowchart Seiko Instruments Inc. 43 2-WIRE REAL-TIME CLOCK S-35399A02 Examples of Application Circuits 10 kΩ VDDL V DD S-35399A02 VSS S DA SCL CTRL FOUT XIN X OUT F32K VSS INT1 INT2 1 kΩ 1 kΩ 10 kΩ CPU VC C Rev.1.0_00 VCC 10 kΩ System power supply Cg Caution 1. 2. Because the I/O pin has no protective diode on the VDD side, the relation of VCC ≥ VDD is possible. But pay careful attention to the specifications. Start communication under stable condition after power-on the power supply in the system. Figure 58 Application Circuit 1 10 k Ω VDDL V DD S-35399A02 VSS INT1 INT2 1 kΩ 1 kΩ CPU 10 k Ω VCC System power supply SDA SCL CTRL FOUT XIN X OUT F32K VSS Cg Caution Start communication under stable condition after power-on the power supply in the system. Figure 59 Caution Application Circuit 2 The above connection diagrams do not guarantee operation. Set the constants after performing sufficient evaluation using the actual application. 44 Seiko Instruments Inc. Rev.1.0_00 Adjustment of Oscillation Frequency 1. Configuration of oscillator 2-WIRE REAL-TIME CLOCK S-35399A02 Since crystal oscillation is sensitive to external noise (the clock accuracy is affected), the following measures are essential for optimizing the oscillation configuration. (1) (2) (3) (4) (5) Place the S-35399A02, crystal oscillator, and external capacitor (Cg) as close to each other as possible. Increase the insulation resistance between pins and the substrate wiring patterns of XIN and XOUT. Do not place any signal or power lines close to the oscillator. Locating the GND layer immediately below the oscillator is recommended. Locate the bypass capacitor adjacent to the power supply pin of the S-35399A02. Parasitic capacitance Cpi XIN Rf Cg Crystal oscillator: 32.768 kHz CL = 6 pF*1 Cg = 0 to 9.1 pF Parasitic capacitance Cpo Cpi, Cpo < 5 pF Rd Oscillator internal constant standard values: Rf = 100 MΩ Rd = 100 kΩ Cd = 8 pF XOUT Cd S-35399A02 *1. When using a crystal oscillator with a CL value of 7 pF, externally connect Cd if necessary. Figure 60 Connection Diagram 1 Cg Locate the GND layer in the layer immediately below VSS XIN XOUT D1 Crystal oscillator A2 B2 C2 D2 Make all the wiring reverse from the crystal oscillator A3 B3 VDD D3 S-35399A02 Top View Surface wiring Rear surface wiring Figure 61 Caution Connection Diagram 2 1. When using the crystal oscillator with a CL exceeding the rated value (7 pF) (e.g : CL = 12.5 pF), oscillation operation may become unstable. Use a crystal oscillator with a CL value of 6 pF or 7 pF. 2. Oscillation characteristics is subject to the variation of each component such as substrate parasitic capacitance, parasitic resistance, crystal oscillator, and Cg. When configuring an oscillator, pay sufficient attention for them. Seiko Instruments Inc. 45 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 2. Measurement of oscillation frequency When the S-35399A02 is turned on, the internal power-on detector operates and a signal of 1 Hz is output from the INT 1 pin to select the crystal oscillator and optimize the Cg value. Turn the power on and measure the signal with a frequency counter following the circuit configuration shown in Figure 62. If 1 Hz signal is not output, the power-on detector does not operate normally. Turn off the power and then turn it on again. For how to apply power, refer to “ Power-on Detector and Register Status”. Remark If the error range is ±1 ppm in relation to 1 Hz, the time is shifted by approximately 2.6 seconds per month (calculated using the following expression). 10–6 (1 ppm) × 60 seconds × 60 minutes × 24 hours × 30 days = 2.592 seconds 1 kΩ 1 kΩ SDA SCL S-35399A02 VDD VDDL XIN Cg XOUT 10 kΩ Open Open Open Open or pull-up CTRL F32K FOUT INT2 INT1 Frequency counter VSS Figure 62 Configuration of Oscillation Frequency Measurement Circuit Caution 1. Use a high-accuracy frequency counter of 7 digits or more. 2. Measure the oscillation frequency under the use operation conditions. 3. Since the 1 Hz signal continues to be output, initialization must be executed during normal operation. 46 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 3. (1) Adjustment of oscillation frequency Adjustment by setting Cg Matching of the crystal oscillator with the nominal frequency must be performed with the stray capacitance on the board included. Select a crystal oscillator and optimize the Cg value in accordance with the flowchart below. START Select a crystal oscillator*1 Variable capacitance Fixed capacitor NO Set Cg YES Trimmer capacitor Set to center of variable capacitance*3 NO Cg in specification YES Optimal value*2 YES END NO Change Cg Frequency YES NO Make fine adjustment of frequency using variable capacitance *1. Request a crystal manufacturer for matching evaluation between the IC and a crystal. The recommended crystal characteristic values are, CL value (load capacitance) = 6 pF, R1 value (equivalent serial resistance) = 50 kΩ max. *2. The Cg value must be selected on the actual PCB since it is affected by stray capacitance. Select the external Cg value in a range of 0 pF to 9.1 pF. *3. Adjust the rotation angle of the variable capacitance so that the capacitance value is slightly smaller than the center, and confirm the oscillation frequency and the center value of the variable capacitance. This is done in order to make the capacitance of the center value smaller than one half of the actual capacitance value because a smaller capacitance value increases the frequency variation. Figure 63 Crystal Oscillator Setting Flow Caution 1. The oscillation frequency varies depending on the ambient temperature and power supply voltage. Refer to “ Characteristics (Typical Data)”. 2. The 32.768 kHz crystal oscillator operates more slowly at an operating temperature than higher or lower 20 to 25°C. Therefore, it is recommended to set the oscillator to operate slightly faster at normal temperature. Seiko Instruments Inc. 47 2-WIRE REAL-TIME CLOCK S-35399A02 Product Name Structure S-35399A02 - HRT1 Rev.1.0_00 Package name (abbreviation) and IC packing specification HRT1 : WLP-12A, Tape Product name Precautions • Although the IC contains a static electricity protection circuit, static electricity or voltage that exceeds the limit of the protection circuit should not be applied. • Seiko Instruments Inc. assumes no responsibility for the way in which this IC is used in products created using this IC or for the specifications of that product, nor does Seiko Instruments Inc. assume any responsibility for any infringement of patents or copyrights by products that include this IC either in Japan or in other countries. Cautions on Using WLP Package • The silicon surface of the device is exposed on the marking side of the package. This portion is less strong against the mechanical stress compared with normal plastic packages, handle packages with extreme care to avoid any cracking and defects. The PCB potential of the device is exposed on the silicon surface, so be careful not to touch the external potential. • Translucent resin is coated over the device side of this package. Note that using the package with the device exposed to a strong light source may affect the device characteristics. 48 Seiko Instruments Inc. Rev.1.0_00 Characteristics (Typical Data) (1) Current consumption 1 (current consumption out of communication) vs. VDD characteristics 2-WIRE REAL-TIME CLOCK S-35399A02 (2) Current consumption 2 (current consumption when 32.768 kHz is output) vs. VDD characteristics Ta = 25°C, CL = 6 pF, Cg = 5.1 pF 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 VDD [V] 4 5 6 1.0 0.8 0.6 0.4 0.2 0 0 Ta = 25°C, CL = 6 pF, Cg = 5.1 pF IDD1 [µA] IDD2 [µA] 1 2 3 VDD [V] 4 5 6 (3) Current consumption 3 (current consumption during communication) vs. Input clock characteristics (4) Current consumption 1 (current consumption out of communication) vs. Temperature characteristics Ta = 25°C, CL = 6 pF, Cg = 5.1 pF 90 80 70 60 IDD3 [µA] 50 40 30 20 10 0 0 100 200 300 SCL [kHz] 400 500 VDD = 3.0 V VDD = 5.0 V IDD1 [µA] 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 −40 −25 0 CL = 6 pF, Cg = 5.1 pF VDD = 5.0 V VDD = 3.0 V 25 Ta [°C] 50 75 85 (5) Current consumption 1 (current consumption out of communication) vs. Cg characteristics (6) Oscillation frequency vs. Cg characteristics Ta = 25°C, CL = 6 pF 1.0 0.9 0.8 0.7 IDD1 [µA] 0.6 0.5 0.4 0.3 0.2 0.1 0 0 2 4 6 Cg [pF] 8 10 VDD = 3.0 V VDD = 5.0 V Ta = 25°C, CL = 6 pF, Cg = 5.1 pF (reference) 60 40 20 ∆f/f [ppm] VDD = 5.0 V 0 VDD = 3.0 V −20 −40 −60 0 2 4 6 Cg [pF] 8 10 Seiko Instruments Inc. 49 2-WIRE REAL-TIME CLOCK S-35399A02 Rev.1.0_00 (7) Oscillation frequency vs. VDD characteristics (8) Oscillation frequency vs. Temperature characteristics Ta = 25°C, CL = 6 pF, Cg = 5.1 pF (reference) 50 40 30 20 ∆f/f [ppm] 10 0 −10 −20 −30 −40 −50 0 1 2 3 VDD [V] 4 5 6 CL = 6 pF, Cg = 5.1 pF (reference) 20 0 −20 −40 ∆f/f −60 [ppm] −80 −100 −120 −140 −40 −25 0 25 Ta [°C] 50 75 85 VDD = 5.0 V VDD = 3.0 V (9) Oscillation start time vs. Temperature characteristics (XOUT PIN MONITORED) (10) Output current characteristics 1 (VOUT vs. IOL1) Ta = 25°C, CL = 6 pF 500 450 400 350 300 tSTA 250 [ms] 200 150 100 50 0 0 2 4 6 Cg [pF] 8 10 VDD = 3.0 V INT 1 pin, INT2 pin, F32K pin, Ta = 25°C 40 35 30 25 IOL1 [mA] 20 15 10 5 0 0 1 2 4 3 VOUT [V] 5 6 VDD = 3.0 V VDD = 5.0 V VDD = 5.0 V (11) Output current characteristics 2 (VOUT vs. IOL2) (12) Output current characteristics 3 (VDD vs. IOH) SDA pin, FOUT pin, Ta = 25°C 70 60 50 IOL2 [mA] 40 30 20 10 0 0 1 2 3 VOUT [V] 4 5 6 VDD = 3.0 V VDD = 5.0 V 0 −0.5 −1.0 IOH −1.5 [mA] −2.0 −2.5 −3.0 −3.5 0 0.1 VDD = 5.0 V FOUT pin, Ta = 25°C VDD = 3.0 V 0.2 0.3 0.4 VDD−VOUT [V] 0.5 0.6 50 Seiko Instruments Inc. Rev.1.0_00 2-WIRE REAL-TIME CLOCK S-35399A02 (13) Input current characteristics (VIN vs. IIH) (14) Low power supply voltage detection voltage and release voltage, time keeping power supply voltage (Min) vs. Temperature characteristics CTRL pin, Ta = 25°C 700 VDD = 5.0 V 600 500 IIH 400 [µA] 300 200 100 0 0 1 2 4 3 VIN [V] 5 6 VDD = 3.0 V VDD [V] 1.2 1.0 0.8 0.6 0.4 0.2 0 −40 −25 0 1.4 CL =6 pF, Cg = 5.1 pF Release voltage Detection voltage VDDT (Min) 25 Ta [°C] 50 75 85 Seiko Instruments Inc. 51 1.84±0.02 0.6max. S ø0.25±0.02 0.15±0.03 0.06 S 12-(ø0.25) 1 D B 2 3 AC B A 0.5 No. HA012-A-P-SD-2.1 WLP-12A-A-PKG Dimensions HA012-A-P-SD-2.1 TITLE No. SCALE UNIT Seiko Instruments Inc. ø1.5 -0 +0.1 2.0±0.05 4.0±0.1 0.18±0.05 ø0.5±0.05 4.0±0.1 0.75±0.05 2.23 0.8 0.22 0.6 1.93±0.05 D3 D2 D1 A3 A2 A1 Feed direction No. HA012-A-C-SD-2.0 TITLE No. SCALE UNIT WLP-12A- A - C a r r i e r T a p e HA012-A-C-SD-2.0 mm Seiko Instruments Inc. 12.5max. 9.0±0.3 Enlarged drawing in the central part ø13±0.2 No. HA012-A-R-SD-1.0 TITLE No. SCALE UNIT WLP-12A- A - R e e l HA012-A-R-SD-1.0 QTY. mm 3,000 Seiko Instruments Inc. • • • • • • The information described herein is subject to change without notice. Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. When the products described herein are regulated products subject to the Wassenaar Arrangement or other agreements, they may not be exported without authorization from the appropriate governmental authority. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Seiko Instruments Inc. is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc. Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.