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BL5372 Dataheets PDF



Part Number BL5372
Manufacturers SHANGHAI BELLING
Logo SHANGHAI BELLING
Description Low-power real-time clock chip
Datasheet BL5372 DatasheetBL5372 Datasheet (PDF)

SHANGHAI BELLING BL5372 Low Power Real-Time Clock (RTC) GENERAL DESCRIPTION The BL5372 is a CMOS type real-time clock, which is connected to the CPU via two wires and capable of serial transmission of clock to the CPU. The BL5372 can generate various periodic interrupt clock pulses lasting for long period (one month), and alarm interrupt can be made by two incorporated systems. Since an oscillation circuit is driven at a constant voltage, it undergoes fluctuations of few voltage and consequent.

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SHANGHAI BELLING BL5372 Low Power Real-Time Clock (RTC) GENERAL DESCRIPTION The BL5372 is a CMOS type real-time clock, which is connected to the CPU via two wires and capable of serial transmission of clock to the CPU. The BL5372 can generate various periodic interrupt clock pulses lasting for long period (one month), and alarm interrupt can be made by two incorporated systems. Since an oscillation circuit is driven at a constant voltage, it undergoes fluctuations of few voltage and consequently offers low current consumption (TYP. 400nA @ 5V) It also provides an oscillator halt sensing function applicable for data validation at power-on and other occasions. The product also incorporates a time trimming circuit that adjusts the clock with higher precision by adjusting any errors in crystal oscillator frequencies based on signals from the CPU. The crystal oscillator may be selected from 32KHz or 32.768KHz types. It adopts 8-pin SOP or TSSOP package. FEATURES ƒ Lowest supply current: 400nA TYP. @ 5V ƒ Connected to the CPU via only 2-wires (MAX. 100KHz) ƒ A clock counter (counting hours, minutes, and seconds) and a calendar counter (counting leap years, years, months, days, and days of the week) in BCD codes ƒ Two systems output providing interrupt to the CPU output (period of one month to one second, interrupt halt function) ƒ Two systems output of alarm functions ƒ Oscillation halt sensing to judge internal data validity ƒ Clock output of 32.768KHz (32KHz) (output controllable via a register) ƒ Second digit adjustment by ±30 seconds ƒ Automatic leap year recognition up to the year 2099 ƒ 12-hour or 24-hour time display selectable ƒ High precision time trimming circuit ƒ Oscillator of 32.768KHz or 32KHz may be used ƒ CMOS logic ƒ Package: 8pin SOP or TSSOP BL5372 Data Sheet 1 Shanghai Belling ORDERING INFORMATION Type number BL5372 BL5372T Name SOP8 TSSOP8 Package Description plastic small outline package;8 pins; body width 3.9mm plastic thin shrink small outline package; 8 pins; body width 4.3mm BLOCK DIAGRAM PIN CONFIGURATION 8pin SOP INTRB 1 SCL 2 SDA 3 GND 4 8 VDD 7 OSCIN 6 OSCOUT 5 INTRA BL5372 BL5372T 8pin TSSOP INTRB 1 SCL 2 SDA 3 GND 4 8 VDD IN 7 OSCOUT 6 OSCRA 5 INT PIN DEFINITION Pin No. Symbol 1 INTRB 2 SCL 3 SDA 4 GND 5 INTRA 6 OSCOUT 7 OSCIN 8 VDD Definition Interrupt Output B Serial Clock Line Serial Data Line Ground Power Interrupt Output A Oscillator Circuit Output Oscillator Circuit Input Supply Voltage Value 0~12V 0~5.5V 0~5.5V 0V 0~12V 0~1.5V 0~1.5V 1.8V~5.5V IN/OUT OUT IN IN/OUT POWER OUT OUT IN POWER 2 BL5372 Data Sheet Shanghai Belling VDD and GND BL5372 VDD C1 GND VDD 0.1u + C2 GND Bypass Capacitance The VDD pin is connected to the positive power supply and GND to the ground. To prevent the possibility of noise, when rapidly changing signal took place on BL5372 pin, we have to place a capacitance beside the BL5372. One possibility is to place a bypass capacitance as close as to the BL5372. T.


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