SM8580AM_06 Nippon_Precision_Circuits America, SM8580AM_06 Datasheet
SM8580AM_06
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SM8580AM_06 Summary of contents
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OVERVIEW The SM8580AM is a real-time clock IC based on a 32.768kHz crystal oscillator, which features a 4-bit parallel interface for communication with an external microcontroller. It comprises second-counter to year-counter clock and calendar circuits that feature automatic leap-year adjustment ...
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BLOCK DIAGRAM XT XTN AIRQN TIRQN FOUT FCON WRN RDN CE0N CE1 SM8580AM C G Digital Trimming C OSC Divider D Controller Clock and Calendar Counter Alarm Register Interrupt Control Timer Register FOUT FOUT ...
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PIN DESCRIPTION Number Name I/O 1 CE0N I 2 FCON I 3 FOUT O 4 VTEMP O 5 AIRQN O 6 TIRQN RDN I 12 VSS ...
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FOUT Output and SM8580AM Access Relationship CE0N CE1 HIGH LOW LOW LOW HIGH HIGH LOW HIGH SPECIFICATIONS Absolute Maximum Ratings Parameter Supply voltage range Input voltage range Output voltage range Storage temperature range Recommended Operating Conditions ...
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DC Electrical Characteristics = 1.6 to 5.5V − ° C unless otherwise noted 0V Parameter Symbol Current consumption DD1 DD Current consumption DD2 DD ...
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Terminal Capacitance Characteristics Ta = 25° 1MHz Parameter Address input capacitance Data output capacitance Oscillator Characteristics Ta = 25°C, NPC’s standard crystal (C Parameter Oscillator start time Oscillator stop voltage Frequency voltage characteristic Frequency accuracy Input capacitance Output ...
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AC Characteristics ( −40 to 85°C, inputs 2.4 to 3.6V output load capacitance C = 100pF (t L Parameter Read cycle time Address access time CE access time RD access ...
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Data read CE0N CE1 RDN Data write CE control CE0N* CE1 WRN control CE0N CE1 WRN When writing data, CE0N ...
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Temperature Sensor = 0V −40 to 85°C unless otherwise noted Parameter Symbol Temperature sensor output voltage V OUT Output accuracy T ACR 1 Temperature sensitivity V 2 ∆NL Linearity Temperature detection range T OPR 3 Output ...
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Backup Transfer and Return 1 Parameter Supply voltage falling edge CE setup time Supply voltage fall time Supply voltage rise time Supply voltage rising edge CE hold time 1. Before switching the supply, confirm that the chip enable CE1 is ...
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FUNCTIONAL DESCRIPTION Register Tables Bank 0 (clock, calendar registers) Address Register Bit 3 Bit Second registers 1 FOS Minute registers Hour registers Day ...
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Control Registers (All Banks, Register E (bits 2, 3) and F) Bank Address TEST bit I Factory test bit. This bit should be set to 0. Take care when writing to other E register bits ...
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Function operation table I Bit STOP ADJ ±30 seconds adjust function 2. The clock stops, and the ±30 seconds adjust function operates the timer source clock frequency is ≤ ...
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Clock and Calendar Registers (Bank 0, Registers Clock counters (registers Bank Address Data in these registers is interpreted in BCD format. For example, if the seconds registers ...
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Alarm Registers (Bank 1, Registers Alarm control register (register E) Bank Address bit (alarm flag) I The AF bit is set to 1 when an alarm event is occurred, when the settings in ...
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Timer Registers (Bank 2, Registers Timer control registers (registers 8, E) Bank Address bit (timer enable) I Timer countdown stop/start control bit. When set to 1, the timer starts counting down. When ...
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Timer counter set registers (registers Bank Address 4 Timer counter set registers Timer counter output registers 7 Registers 4 and 5 set an 8-bit presettable binary down-counter value for the timer interrupt function. I ...
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CE1 Control Register (Bank 1, Register B) Bank Address 1 B This register determines whether the temperature sensor function and digital correction function in combina- I tion with the CE1 input pin. CTEMP determines the temperature sensor operation, and CDT_ON ...
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Frequency Set Registers (Bank 1, Registers C, D) Bank Address C FOUT divider set register 1 D FOUT frequency set register FD3, FD4 bit I FOUT source clock frequency set bits. FD4 FD3 ...
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Digital Correction Registers (Bank 2, Registers 0, 1) Bank Address 0 2 Digital correction registers 1 These registers enable and set the level of digital correction applied to oscillator clock. DT_ON enables the I correction function, and bits DT0 to ...
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INTERRUPT OPERATION Alarm Interrupt When AIE is 1 and an alarm event occurs (AF bit is set to 1), AIRQN output goes LOW. If AIE is 0, however, AIRQN high-impedance state. The alarm interrupt is output when ...
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Periodic interrupt mode (TI/ When TIE is 1 and a timer interrupt event occurs (TF bit is set to 1), TIRQN goes LOW. If TIE is 0, however, TIRQN high-impedance state, and the TF bit ...
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APPLICATION NOTES Setting the Alarm Alarms can be set for day, weekday, hour, minute, and second. However not possible to set an alarm for more than one weekday. Note that it is recommended that AF and AIE be ...
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Monitoring Digital Correction Using the test mode allows the 64Hz digital correction clock to be output on pin FOUT. The test mode works as follows. 1. Apply a HIGH-level on FCON. 2. Set the FOUT frequency set register FE bit ...
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Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on ...