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PT7C4372CLE Datasheet(PDF) 6 Page - Pericom Semiconductor Corporation |
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PT7C4372CLE Datasheet(HTML) 6 Page - Pericom Semiconductor Corporation |
6 / 30 page |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 12-07-0001 PT0150-8 07/04/12 6 PT7C4372A/4372C Real-time Clock Module (I 2C Bus) Function Description Overview of Functions Clock function CPU can read or write data including the year (last two digits), month, date, day, hour, minute, and second. Any (two-digit) year that is a multiple of 4 is treated as a leap year and calculated automatically as such until the year 2099. Clock precision adjustment function They have two internal oscillation circuit capacitors, so that an oscillation circuit may be configured simply by externally connecting a crystal. Either 32.768kHz or 32.000kHz crystal may be selected to setting the internal register appropriately. The clock precision can be adjusted forward or back in units of ±3.051 ppm (32.768kHz crystal) or ±3.125 ppm (32.000kHz crystal) and oscillation frequency can be adjusted in ±189 ppm (32.768kHz crystal) or ±194 ppm (32.000kHz crystal). This function can be used to implement a higher-precision clock function, such as by: Enabling higher clock precision throughout the year by taking seasonal clock precision adjustments into account in advance, or Enabling correction of temperature-related clock precision variation in systems that include a temperature detecting function. Periodic interrupt PT7C4372A/C Periodic interrupts can be output via the /INTA and /INTB pins. Select among five Periodic frequency settings: 2 Hz (every 0.5 seconds), 1 Hz (every second), 1/60 Hz (every minute), 1/3600Hz (every hour), or monthly. Select among two output waveforms for periodic interrupts: ordinary pulse waveform (2 Hz or 1 Hz) or waveforms (every second, minute, hour, or month) for CPU-level interrupts that can support CPU interrupts. A polling function is also provided to enable monitoring of pin states via registers. Alarm function PT7C4372A/C This module is has two alarm system (Alarm_A and Alarm_B) that outputs interrupt signals from /INTA or /INTB to CPU when the day of the week, hour or minute corresponds to the setting. Each of them may output interrupt signal separately at a specified time. The alarm may be selectable between on and off for each day of the week, thus allowing outputting alarm everyday or on a specific day of the week. The Alarm_A is output from the /INTA pin while the Alarm_B is output from either the /INTA or the /INTB pins. Polling is possible separately for each alarm function. Oscillation stop detection function, power drop detection function (voltage monitoring function), and power-on reset detection function PT7C4372A/ C have only oscillation stop detection function. The oscillation stop detection function uses registers to record if clock data is valid or invalid. This function may be used to determine if the PT7C4372A/C supply power has been booted from 0V and if it has been backed up. Interface with CPU Data is read and written via the I 2C bus interface using two signal lines: SCL (clock) and SDA (data). Since the output of the I/O pin of SDA is open drain, a pull- up resistor should be used on the circuit board if the CPU output I/O is also open drain. The SCL's maximum clock frequency is 400 kHz, which supports the I 2C bus's high-speed mode. 32-kHz clock output The 32.768 kHz clock (32.768kHz crystal) or 32.000kHz clock (32.000kHz crystal) can be output via the /INTB by setting corresponding register. Note: The precision of this 32.768 kHz clock output via the FOUT pin can not be adjusted (even when using the clock precision adjustment function). |
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