em3027 EM Microelectronic, em3027 Datasheet
em3027
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em3027 Summary of contents
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... Real Time Clock with I2C or SPI, Crystal Temperature Compensation, Battery Switchover and Trickle Charger Description The EM3027 is an Ultra Low Power CMOS real-time clock IC with two serial interface modes: I2C or SPI. The interface mode is selected by the chip version. The basic clock is obtained from the 32.768 kHz crystal oscillator ...
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... Power Management ....................................................................................................................................................... 19 9.1 Power Supplies, Switchover and Trickle Charge..................................................................................................... 19 9.2 Low Supply Detection ............................................................................................................................................. Characteristics .................................................................................................................................................. 21 10.1 AC characteristics – I2C ..................................................................................................................................... 21 10.2 AC characteristics – SPI..................................................................................................................................... 23 11 Using EM3027 with disturbed Supply Voltage Package Information ............................................................................................................................................... 26 12.1 TSSOP-08/14 ..................................................................................................................................................... 26 12.2 SO-8................................................................................................................................................................... 26 13 Ordering Information ............................................................................................................................................... 27 Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B ............................................................................................. 25 ...
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... CLKOE EM3027 V CLKOUT Reg V Back CS INT SCK Vss SO SPI Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B EM3027 Pin Name Function 1 X1 32.768 kHz crystal input 2 X2 32.768 kHz crystal output 3 V Backup Supply Voltage Back 4 V Ground Supply SS 5 SDA ...
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... I2C: SDA, SCL Back Clk/Int=’0’ SPI: All inputs Back 1.3 3.3 0 5.0 SCL = 100kHz 1.3 (See Note 1) SCL = 400kHz 3.3 (See Note 1) SCL = 400kHz 5.0 (See note 1) 4 EM3027 Symbol Min Typ T - 1.3 5.0 V Back , CC C 100 D V Back Symbol Min ...
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... CC Back V =5.0V, V =3.0V CC Back V =5.0V, V =3.0V CC Back , LEAK_OUT , Δf/(f*ΔV) are characterised during the qualification of the IC STA IN OUT 5 EM3027 - -40 to 125 18 - -40 to 125 55 - -40 to 125 75 -40 to 125 1.70 1.87 -40 to 125 1.25 1.40 -40 to 125 20 0.2V CC 0. ...
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... SCL/SCK SI Inputs CS Stages SDA/SO CLKOE 4.2 Application Schematic Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B V High Voltage Regulator Prescaler Control I2C SPI Output Buffers INT CLKOUT SDA/SO 6 EM3027 Voltage Monitoring V REG RTC RAM EEPROM Thermometer Crystal Layout Example www.emmicroelectronic.com ...
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... application. T [°C] A principle of the frequency compensation is based on the adding/removing of pulses. Example 2: Qcoef=0.035; T Temperature -50 100 150 7 EM3027 2 = × − − Qcoef (T To) XtalOffset – Thermal quadratic coefficient [ppm/°C – Actual temperature in [°C] – Turnover temperature in [°C] – Crystal offset at T ...
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... Values to be stored in EEPROM Control Page have to be corrected in the following way: Qcoef = 4096*(1.05*Qcoef 0_real XtalOffset = 1.05*XtalOffset Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B pin. at different temperatures (at least five measurements in equidistant points in the O 2 /(4a). ), real . real 8 EM3027 – www.emmicroelectronic.com O ...
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... R 5 Memory Mapping Table 8 Unused bit Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B EM3027 9 www.emmicroelectronic.com ...
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... Alarm information (BCD format) PM/2 S12/24 = ‘0’ PM/2 represents 2 tens, S12/24 = ’1’ PM/2 = ‘1’ represents PM (afternoon), PM/2 =’0’ represents AM (morning) Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev below Vlow2 (clear by ‘0’ writing) CC Back or V below Vlow1 (clear by ‘0’ writing) CC Back 10 EM3027 www.emmicroelectronic.com ...
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... Turn over temperature of the used crystal in °C. 0_real RAM Page - Register RAMdata RAMdata RAM data used for application general purposes Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B and V High Back real real – EM3027 in ppm. Example: value 63d is related O www.emmicroelectronic.com ...
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... At the end of each transmission a stop bit is send (transmission STOP). Data Byte Data Byte ACKs ACKs (1) Slave R/W Address ACKs P S 1010110 1 ACKs 12 EM3027 Data Byte ACKs ACKs (n-1) (n) Data Data byte ACKm byte ACKm (1) (n) www.emmicroelectronic.com P P ...
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... R As the EM3027 has an integrated pull up resistor (100kΩ SCL, the supply V transmission, also if other IC's are addressed (due to EM3027 internal protection diode on SCL and SDA pins) 7.2 How to perform READ/WRITE through SPI The SPI protocol is used to connect master and slaves. 4 wires are used: CS (Chip Select), SCK (serial clock), SI (input data) and SO (output data) ...
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... R Transmission START CS SCK R Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev Figure 4 – SPI Read Transmission 14 EM3027 ... ... Transmission STOP ... ... ... ... www.emmicroelectronic.com ...
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... Vlow2 is detected, the fast detection mode is stopped and the EEPROM read is enabled. D The configuration registers are loaded with the configuration data read from the EEPROM (Addresses 0x29 to 0x33). The EM3027 starts its normal function, depending on the supply voltage level applied. 8.2 Normal Mode function The chip has following functions in Normal Mode: 1 ...
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... EEPROM write prog Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B TD1 TD0 Timer frequency 0.5 Hz Table 10 – Timer Frequency Selection ThPer Period in Seconds Table 11 – Thermometer Period 16 EM3027 www.emmicroelectronic.com ...
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... Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev Yes Select Clocks Out Description 32768 Hz Crystal Oscillator without correction 1024 Table 12 – Output Clock frequency selector 17 EM3027 Clear EERefOn EEBusy = 0 ? Yes Write EEPROM EEBusy = 0 ? Yes Next Write ? No Set EERefOn Compensated frequency www.emmicroelectronic.com ...
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... Register Map The address range of the EM3027 is divided into pages. The page is addressed by the five most significant bits of the address. The three low significant bits of the address provide selection of registers inside the page. During address incrementing only three low significant bits are changed. The page address part is fixed during whole data transmission. ...
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... V pin. The switchover block implemented inside the chip CC Back > this condition the input and output pins are enabled. CC Back, Figure 7 – Operating voltage functions 19 EM3027 V REG Vlow1 Vlow2 level that supplies the chip. High pin only. For that reason (i. ...
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... When bit VLOW2 is set, it can only be reset by increasing the supply above the level Vlow2 and then writing ‘0’ into the VLOW2 status bit. Below the Vlow2 level the EEPROM read out is disabled and the device functionality is not guaranteed. Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B and V ...
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... Setup Time (Repeated) STOP Condition Length of spikes suppressed by the input filter on SCL ans SDA Capacitive Load For Each Bus Line I/O Capacitance (SDA, SCL) Internal SCL pull-up resistor Table 13 Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B SYMBOL CONDITIONS Vcc ≥ 3.0V f Vcc >1.8V SCL Vcc>1.3V Vcc ≥ ...
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... Verified by design. Not tested in production Notes: 1) Falling time on SDA driven by EM3027 can be shorter than There are parasitic diodes between SCL, SDA pads and 3) Device does not internally provide a hold time of 300ns as required by I2C standard. Calculation of external-pull up All of the following conditions have to be met: - Rise time is equal to 0 ...
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... Verified by design. Not tested in production 1) Max. bus capacitance on SO line shall be lower than 100pF and 50pF when 2) Spikes on SCK signal shorter than 50ns are suppressed SCK SI SO Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B SYMBOL CONDITIONS f Vcc ≥ 3.0V SCK Vcc >1.8V Vcc >1.3V t Vcc ≥ ...
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... SCK SI SO Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev CDH R Figure 10 : Timing - SPI write 24 t CCH t CWL D0 t CDZ www.emmicroelectronic.com ...
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... Using EM3027 with disturbed Supply Voltage the power supply of the EM3027 (V oscillator has a very low power consumption, the clock generation is sensitive to fast supply changes and clock pulses could be lost the application, positive or negative V EM3027 must be used, according to the following figure : Figure 9 : Typical Schematic + C XI ...
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... D SEE VARIATIONS 4.30 4. 0.65 BSC E 6.40 BSC 0.50 0. SEE VARIATIONS P SEE VARIATIONS P1 SEE VARIATIONS 0° ALL DIMENSIONS IN MILLIMETERS 12.2 SO-8 Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B 1.00 DIA E SEE D DETAIL "A" EVEN LEAD SIDES END VIEW TOPVIEW 0.05 C ...
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... No licenses to patents or other intellectual property of EM are granted in connection with the sale of EM products, expressly or by implications. EM's products are not authorized for use as components in life support devices or systems. Copyright © 2008, EM Microelectronic-Marin SA 07/08 – rev B EM3027 SO8B Package SO8B= ...