EM3027 UL1642 TSSOP14 3027-DS TSSOP-08/14 MIL-STD-883C 95VCC 05VCC O-100 S12/24 - Datasheet Archive

 

- MARIN SA EM3027 Real Time Clock with I2C or SPI, Crystal Temperature Compensation, Battery Switchover and Trickle Charger

 

EM MICROELECTRONIC - MARIN SA EM3027 EM3027 Real Time Clock with I2C or SPI, Crystal Temperature Compensation, Battery Switchover and Trickle Charger Description Features The EM3027 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 (see §12). The basic clock is obtained from the 32.768 kHz crystal oscillator. A thermal compensation of the frequency is based on the temperature measurement and calculation of the correction value. The temperature can be measured internally or be input by an external application to the register. The chip provides clock and calendar information in BCD format with alarm possibility. The actual contents are latched at the beginning of a read transmission and afterwards data are read without clock counter data corruption. An integrated 16-bit timer can run in Zero-Stop or AutoReload mode. An interrupt request signal can be provided through INT/IRQ pin generated from alarm, timer, voltage detector and Self-Recovery system. An integrated trickle charger allows recharging backup supply VBack from the main supply voltage VCC through internal resistor(s). The internal device supply will switchover to VCC when VCC is higher than VBack and vice versa. The device operates over a wide 1.4 to 5.5V supply range and requires only 900 nA at 5V. It can detect internally two supply voltage levels. Applications Utility meters Battery operated and portable equipment Consumer electronics White/brown goods Pay phones Cash registers Personal computers Programmable controller systems Data loggers Fully operational from 2.1 to 5.5V Supply current typically 600 nA at 1.4V Thermal compensated crystal frequency Oscillator stability 0.5 ppm / Volt Counter for seconds, minutes, hours, day of week, date months, years in BCD format and alarm Leap year compensation 16-bits timer with 2 working modes Two low voltage detection levels VLow1, VLow2 Automatic supply switchover 2 Serial communication via I2C (I C-bus specification Rev. 03 compatible ­ see §10.2) or SPI (3-line SPIbus with separate combinable data input and output) Thermometer readable by the host Trickle charger to maintain battery charge Integrated oscillator capacitors Two EEPROM and 8 RAM data bytes for application Digital Self-Recovery system No busy states and no risk of corrupted data while accessing One hour periodical configuration registers refresh Support for standard UL1642 UL1642 for Lithium batteries Standard temperature range: -40°C to +85°C Extended temperature range: -40°C to +125°C Packages: TSSOP8, TSSOP14 TSSOP14, SO8. Block Diagram EM3027 EM3027 Temperature Sensor X1 Watch & Alarm Oscillator X2 VCC VREG VBack SCL/SCK SDA/SO SI Power Management I2C or SPI Timer CS CLKOUT INT or IRQ CLKOE - Seconds - Minutes - Hours - Days - Weekdays - Months - Years Output Control EEPROM Copyright 2010, EM Microelectronic-Marin SA 3027-DS 3027-DS.doc, Version 4.0, 2-Jun-10 1 www.emmicroelectronic.com EM3027 EM3027 Table of contents Table of contents . 2 1 Packages / Pin Out Configuration . 3 2 Absolute Maximum Ratings . 4 2.1 Handling Procedures . 4 2.2 Operating Conditions . 4 2.3 Crystal characteristics . 4 2.4 EEPROM Characteristics . 4 3 Electrical Characteristics . 4 4 EM3027 EM3027 Block Diagram and Application Schematic. 6 4.1 Block Diagram . 6 4.2 Application Schematic . 6 4.3 Crystal Thermal Behaviour . 7 4.4 Crystal Calibration . 8 5 Memory Mapping. 9 6 Definitions of terms in the memory mapping . 10 7 Serial communication . 12 7.1 How to perform data transmission through I2C . 12 7.2 How to perform data transmission through SPI . 13 8 Functional Description . 15 8.1 Start after power-up . 15 8.2 Normal Mode function . 15 8.3 Watch and Alarm function . 15 8.4 Timer function . 16 8.5 Temperature measurement . 16 8.6 Frequency compensation . 16 8.7 EEPROM memory. 17 8.8 RAM User Memory . 18 8.9 Status Register. 18 8.10 Interrupts . 18 8.11 Self-Recovery System (SRS) . 19 8.12 Register Map . 19 8.13 Crystal Oscillator and Prescaler . 19 9 Power Management . 20 9.1 Power Supplies, Switchover and Trickle Charger . 20 9.2 Low Supply Detection . 21 10 AC Characteristics . 22 10.1 AC characteristics ­ I2C . 22 10.2 I2C Specification compliance . 23 10.3 AC characteristics ­ SPI . 24 11 Package Information . 26 11.1 TSSOP-08/14 TSSOP-08/14 . 26 11.2 SO-8 . 27 12 Ordering Information . 28 Copyright 2010, EM Microelectronic-Marin SA 3027-DS 3027-DS.doc, Version 4.0, 2-Jun-10 2 www.emmicroelectronic.com EM3027 EM3027 1 Packages / Pin Out Configuration SO8-TSSOP8 Vcc X1 X2 IRQ/CLKOUT EM3027 EM3027 VBack SCL Vss SDA I2C TSSOP14 TSSOP14 X1 NC X2 CLKOE SI VCC VReg EM3027 EM3027 VBack IRQ/CLKOUT Pin 1 2 3 4 5 6 7 8 Table 1 Name X1 X2 VBack VSS SDA SCL IRQ/CLKOUT VCC Pin 1 2 3 Name X1 X2 SI 4 VReg 5 VBack INT 6 INT SCK Vss SO 7 8 9 10 11 12 VSS SO SCK CS IRQ/CLKOUT VCC 13 CS CLKOE SPI 14 NC Table 2 Copyright 2010, EM Microelectronic-Marin SA 3027-DS 3027-DS.doc, Version 4.0, 2-Jun-10 3 Function 32.768 kHz crystal input 32.768 kHz crystal output Backup Supply Ground Supply Serial Data Serial Clock Interrupt Request/Clock output Positive Supply Function 32.768 kHz crystal input 32.768 kHz crystal output Serial Data input Regulated Voltage ­ Reserved for test purpose (This output must be left unconnected) Backup Supply Interrupt Request output (Open Drain active low) Ground Supply Serial Data output Serial Clock input Chip Select input Interrupt Request/Clock output Positive Supply Clock Output Enable CLKOE = ,0 CLKOUT is low CLKOE = ,1 CLKOUT is output Not Connected www.emmicroelectronic.com EM3027 EM3027 2 2.2 Absolute Maximum Ratings Parameter Maximum voltage at VCC Minimum voltage at VCC Maximum voltage at any signal pin Minimum voltage at any signal pin Maximum storage temperature Minimum storage temperature Electrostatic discharge maximum to MIL-STD-883C MIL-STD-883C method 3015.7 with ref. to VSS Table 3 Symbol VCCmax VCCmin VSS ­ 0.3V TSTOmax +150°C TSTOmin -65°C VSmax Typ Max Unit TA Operating Temp. -40 Supply voltage VCC, 1.4 5.0 VBack (Note 1) Capacitor at VCC, CD 100 VBack Table 4 Note 1: Refer to paragraphs 9.1 and 9.2 VCC + 0.3V Vmin Parameter Conditions VSS + 6.0V VSS ­ 0.3V Vmax Operating Conditions +125 °C 5.5 V 2.3 Symbol Symbol Frequency Load capacitance Series resistance Table 5 Stresses above these listed maximum ratings may cause permanent damages to the device. Exposure beyond specified operating conditions may affect device reliability or cause malfunction. 7 Typ Max Unit 32.768 kHz 8.2 12.5 pF 70 110 k EEPROM Characteristics Parameter Handling Procedures Symbol Read voltage Programming Voltage This device has built-in protection against high static voltages or electric fields; however, anti-static precautions must be taken as for any other CMOS component. Unless otherwise specified, proper operation can only occur when all terminal voltages are kept within the voltage range. Unused inputs must always be tied to a defined logic voltage level. 3 Min f CL RS Crystal Reference : Micro Crystal CC5V-T1A web: www.microcrystal.com 2.4 2.1 nF Crystal characteristics Parameter 2000V Min Min Typ Max Unit VRead V VProg EEPROM Programming Time Write/Erase Cycling Table 6 1.4 2.2 V TProg 30 5000 ms cycles Electrical Characteristics Parameter Total supply current with Crystal Total supply current with Crystal Symbol ICC IBack Test Conditions All outputs open, Rs < 70 k, VBack = 0V I2C: SDA, SCL at VCC, Clk/Int=0 SPI: All inputs at VSS VCC 1.4 3.3 5.0 All outputs open, Rs < 70 k, VCC = 0V I2C: SDA, SCL at VBack, Clk/Int=0 SPI: All inputs at VSS VBack 1.4 3.3 0 5.0 Dynamic current I2C IDD SCL = 100kHz (See Note 1) SCL = 400kHz (See Note 1) SCL = 400kHz (See note 1) Copyright 2010, EM Microelectronic-Marin SA 3027-DS 3027-DS.doc, Version 4.0, 2-Jun-10 1.4 3.3 5.0 4 Temp. °C -40 to 85 -40 to 125 -40 to 85 -40 to 125 -40 to 85 -40 to 125 -40 to 85 -40 to 125 -40 to 85 -40 to 125 -40 to 85 -40 to 125 -40 to 85 -40 to 125 -40 to 85 -40 to 125 -40 to 85 -40 to 125 Min Typ 0.6 0.8 0.9 0.6 0.8 0.9 Max 1.5 4.6 2.0 5.2 2.2 5.5 1.5 4.6 2.0 5.2 2.2 5.5 12 15 35 40 50 60 Unit µA µA µA www.emmicroelectronic.com EM3027 EM3027 Parameter Dynamic current SPI Interface Low supply detection level1 Low supply detection level2 Switchover hysteresis Symbol IDD Vlow1 Vlow2 Test Conditions SCK = 200 kHz (See Note 2) SCK = 1 MHz (See Note 2) SCK = 1 MHz (See Note 2) Relative to VCC VCC -40 to 125 3.3 5.0 Relative to VCC Min -40 to 125 1.4 Temp. °C -40 to 85 -40 to 125 -40 to 85 -40 to 125 -40 to 85 -40 to 125 Max 14 18 50 55 65 75 Unit 1.8 2.1 V 1.0 1.4 V Vhyst VCC with respect to VBack = 3.0V 1.4 to 5.0 Input Parameters Low level input voltage High level input voltage VIL VIH CS, CLKOE, SI, SCL/SCK, SDA 1.4 to 5.0 Input Leakage IIN 0.0 < VIN < VCC 1.4 to 5.0 -40 to 85 -40 to 125 1.4 -40 to 125 3.3 -40 to 125 5.0 -40 to 125 1.4 to 5.0 -40 to 85 -40 to 125 -1 -1.5 -40 to 125 -40 to 85 -40 to 125 Typ 1.2 Output Parameters Low level output voltage High level output voltage Low level output voltage High level output voltage Low level output voltage High level output voltage Output HiZ leakage on INT Oscillator Start-up voltage Start-up time Frequency stability over voltage Input capacitance on X1 Output capacitance on X2 Trickle Charger Current limiting Resistors VOL -40 to 125 20 0.2VCC 1 1.5 IOL = 0.4 mA VOH 1.0 0.25 IOH = 1.5 mA VOL V IOL = 5.0 mA VOH INT not active VSTA TSTA TSTA < 10s f/(f V) 1.8V VCC 5.5V, TA = +25°C CIN COUT R80k R20k R5k R1.5k 2.7 0.8 IOH = 2.0 mA ILEAK_OUT µA V IOL = 1.5 mA VOH V 0.2 IOH = 0.1 mA VOL mV 0.8VCC -1 -1.5 µA V 4.5 1 1.5 µA V s s 0.5 2 ppm/ V 25 13.5 25 13.5 25 25 25 25 80 20 5.0 1.5 -40 to 85 -40 to 125 TA = +25°C, f = 32.768kHz, Vmeas = 0.3V (Note 3) TA = +25°C, f = 32.768kHz, Vmeas = 0.3V (Note 3) 3 3 25 5.0 0.5 1 +/- 1 +/- 1 pF VCC =5.0V, VBack=3.0V VCC =5.0V, VBack=3.0V VCC =5.0V, VBack=3.0V VCC =5.0V, VBack=3.0V k Thermometer Precision TE Vlow1 < VCC 5.5V +/- 3 +/- 6 °C Table 7 The following parameters are tested during production test: IDD, Vlow1, Vlow2, VIL, VIH, VOL, VOH, IIN, ILEAK_OUT The parameters ICC, Vhyst, VSTA, TSTA, CIN, COUT, f/(f* V), TE are characterised during the qualification of the IC. Notes: 1. SDA = VSS, continuous clock applied at SCL (VIL_SCL < 0.05V, VIH_SCL > 0.95VCC 95VCC) 2. CS, SI = VCC, continuous clock applied at SCK, SO not connected. (VIL_SCK < 0.05VCC 05VCC, VIH_SCK > 0.95VCC 95VCC) Note that there is a 100k pull-down resistor on CS. 3. Vmeas : Peak to peak amplitude during capacitance measurement Copyright 2010, EM Microelectronic-Marin SA 3027-DS 3027-DS.doc, Version 4.0, 2-Jun-10 5 www.emmicroelectronic.com EM3027 EM3027 4 EM3027 EM3027 Block Diagram and Application Schematic 4.1 Block Diagram Switchover VBack VHigh Voltage Regulator Voltage Monitoring Vcc Vss VREG X1 Xtal Oscillator Prescaler RTC X2 RAM 32.768 kHz EEPROM Control SCL/SCK SI I2C SPI Inputs Stages CS SDA/SO Thermometer Output Buffers CLKOE SDA/SO INT 4.2 CLKOUT Application Schematic Crystal Layout Example VCC Supply CD X1 VCC X1 for application use CLKOUT Crystal X2 X2 EM3027 EM3027 VCC CLKOE INT µController VBack Protection Resistor * CS, SCL/SCK SDA/SO SI CD Lithium Battery or Super Cap VSS Serial Interface VSS VSS = 0V * optional for Lithium batteries (