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MCP795W21 数据表(PDF) 2 Page - Micro Analog systems |
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MCP795W21 数据表(HTML) 2 Page - Micro Analog systems |
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2 / 54 page  MCP795WXX/MCP795BXX DS22280A-page 2 Preliminary 2011 Microchip Technology Inc. Description: The MCP795XXX is a low-power Real-Time Clock/ Calendar (RTCC) that uses digital trimming compen- sation for an accurate clock/calendar, an interrupt out- put to support alarms and events, a power sense circuit that automatically switches to the backup sup- ply, non-volatile 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 10 MHz SPI bus that is fast enough to support a programmable millisecond alarm. The device is fully accessible through the serial inter- face, while VCC is between 1.8V and 5.5V, but can operate down to 1.3V through the backup supply con- nected 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 onboard 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. In addition, the MCP795BXX devices support a 32 kHz clock output at power-up on the CLKOUT/BOOT pin by using the same crystal driving the RTCC device. 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 imple- mented 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 /WDO /IRQ /CS Vss Vcc CLKOUT/ BOOT EVHS EVLS SCK SI SO OSC CLKOUT Divider WDT SPI EEPROM SRAM TIME-STAMP ID |
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