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PT7C4337ACZSAE Datasheet(PDF) 7 Page - Pericom Semiconductor Corporation |
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PT7C4337ACZSAE Datasheet(HTML) 7 Page - Pericom Semiconductor Corporation |
7 / 25 page ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 2014-10-0002 PT0480-2 11/03/14 7 PT7C4337A/4337AC Real-time Clock Module (I 2C Bus) Function Block Oscillator Circuit PT7C4337A The PT7C4337A uses an external 32.768 kHz crystal. Table2 specifies several crystal parameters for the external crystal. The Block Diagram shows a functional schematic of the oscillator circuit. The startup time is usually less than 1 second when using a crystal with the specified characteristics. Table2 Crystal Specifications Parameter Symbol Min Typ Max Unit Nominal Frequency fO - 32.768 - kHz Series Resistance ESR - - 70 k Load Capacitance CL - 6/12.5 - pF Note: The crystal, traces, and crystal input pins should be isolated from RF generating signals. Clock Accuracy The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Crystal frequency drift caused by temperature shifts creates additional error. External circuit noise coupled into the oscillator circuit can result in the clock running fast. Figure 1 shows a typical PC board layout for isolating the crystal and oscillator from noise. PT7C4337AC The PT7C4337AC integrates a standard 32,768Hz crystal in the package. Typical accuracy at nominal VCC and +25°C is approximately 10ppm. Time Counter (Sec,Min,Hour,Day,Date,Month,Year) Interrupt Control Square Wave Output Control Comparator 1 Alarm 2 Register (Min, Hour, Day/Date) Comparator 2 Alarm 1 Register (Sec, Min, Hour, Day/Date) Shift Register Address Decoder Address Register INTA SQW/INTB SCL SDA PT7C4337 OSC X1 X2 C G C D 32.768 kHz Control Register Counter Chain I /O Interface (I2C) PT7C4337A |
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