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MCP795W1X Datasheet(PDF) 2 Page - Microchip Technology |
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MCP795W1X Datasheet(HTML) 2 Page - Microchip Technology |
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2 / 54 page  MCP795W1X/MCP795W2X DS22280C-page 2 Preliminary 2011-2012 Microchip Technology Inc. Description: The MCP795WXX is a low-power Real-Time Clock/ Calendar (RTCC) that uses digital trimming compen- sation for an accurate clock/calendar, an interrupt output to support alarms and events, a power sense circuit that automatically switches to the backup supply, nonvolatile memory for safe data storage and several enhanced features that support system requirements. Along with a low-cost 32,768 kHz crystal, this RTCC tracks time using several internal registers and then communicates the data over a 5 MHz SPI bus that is fast enough to support a programmable millisecond alarm. The device is fully accessible through the serial interface, while VCC is between 1.8V and 3.6V, but can operate down to 1.3V through the backup supply connected to the VBAT input for timekeeping and SRAM retention only. As part of the power sense circuit, a time saver function is implemented to store the time when main power is lost and again, when power is restored to log the duration of a power failure. Along with the on-board serial EEPROM and battery- backed SRAM, a 128-bit protected space is available for a unique ID. This space can be ordered preprogrammed with a MAC address, or blank for the user to program. This clock/calendar automatically adjusts for months with fewer than 31 days including corrections for leap years. The clock operates in either 24-hour or 12-hour format with AM/PM indicator and settable alarm(s). Using the external crystal, the CLKOUT pin can be set to generate a number of output frequencies. For versatility, a digital event detect with a programmable pulse count can identify the 1st, 4th, 16th or 32nd pulse before sending an interrupt. A second event detect with built-in debounce input filter was also implemented to support noisy mechanical switches. Since many microcontrollers do not have an integrated Watchdog Timer, this peripheral has been implemented in the RTCC. For many applications, this function must be performed outside the microcontroller for increased robustness. FIGURE 1-1: BLOCK DIAGRAM X1 X2 VBAT WD IRQ CS VSS VCC CLKOUT/ BOOT EVHS EVLS SCK SDI SDO OSC CLKOUT Divider WDT SPI EEPROM SRAM TIME-STAMP ID |
Similar Part No. - MCP795W1X_12 |
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Similar Description - MCP795W1X_12 |
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