MCP795W21 Series

Enhanced Feature Battery-Backed SPI Real-Time Clock/Calendar with Pre-Programmed EUI-48™ MAC ID

Catalog

Enhanced Feature Battery-Backed SPI Real-Time Clock/Calendar with Pre-Programmed EUI-48™ MAC ID

Part	Voltage - Supply, Battery [Max]	Voltage - Supply, Battery [Min]	Features	Memory Size	Package / Case [custom]	Package / Case [custom]	Package / Case	Interface	Supplier Device Package	Type	Time Format	Voltage - Supply [Max]	Voltage - Supply [Min]	Mounting Type	Current - Timekeeping (Max)	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case [x]	Package / Case [y]
Microchip Technology MCP795W21-I/ST	3.6 V	1.3 V	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID Watchdog Timer	64 B	0.173 "	4.4 mm	14-TSSOP	SPI	14-TSSOP	Clock/Calendar	HH:MM:SS:hh (12/24 hr)	3.6 V	1.8 V	Surface Mount	1 µA	85 °C	-40 °C
Microchip Technology MCP795W21T-I/ST	3.6 V	1.3 V	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID Watchdog Timer	64 B	0.173 "	4.4 mm	14-TSSOP	SPI	14-TSSOP	Clock/Calendar	HH:MM:SS:hh (12/24 hr)	3.6 V	1.8 V	Surface Mount	1 µA	85 °C	-40 °C
Microchip Technology MCP795W21-I/SL	3.6 V	1.3 V	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID Watchdog Timer	64 B			14-SOIC	SPI		Clock/Calendar	HH:MM:SS:hh (12/24 hr)	3.6 V	1.8 V	Surface Mount	1 µA	85 °C	-40 °C	0.154 in	3.9 mm
Microchip Technology MCP795W21T-I/SL	3.6 V	1.3 V	Alarm EEPROM Leap Year Square Wave Output SRAM Unique ID Watchdog Timer	64 B			14-SOIC	SPI		Clock/Calendar	HH:MM:SS:hh (12/24 hr)	3.6 V	1.8 V	Surface Mount	1 µA	85 °C	-40 °C	0.154 in	3.9 mm

Catalog

Enhanced Feature Battery-Backed SPI Real-Time Clock/Calendar with Pre-Programmed EUI-48™ MAC ID

Key Features

• * VCC Min = 1.8V

• * Icc < 1 µA

• * Typical Standby Current

• * VBAT Min = 1.3V

• * Ibat < 700nA

• * Typical Timekeeping & SRAM Retention Current

• * VCC to VBAT (VCC Lost)

• * VBAT to VCC (VCC Restored)

• * IRQ (VCC or VBAT)

• * WDO (VCC)

• * Clock Out frequencies: 32.768, 8.192 & 4.096 KHz and 1 Hz

• * Adjusts up to 22 seconds/day

• * SPI Bus or EVHS digital input

• * High speed with programmable pulse count (EVHS)

• * Low speed with programmable debounce delay (EVLS)

• * Protect: None, 1/4, 1/2 or all of array

• * Factory standard MAC address programming or custom ID available

Description

The MCP795W21 SPI RTCC is highly integrated with memory and advanced features normally found in higher priced devices. By starting with a basic real-time clock, digital trimming was added for higher accuracy, a battery switchover for backup power, a timestamp to log power failures and three types of memory, which includes SRAM, EEPROM and a unique ID in a locked section of EEPROM. This ID is preprogrammed with a 48-bit MAC Address, but it can also be ordered blank for the end user to program. By adding a watchdog timer and two programmable event detect inputs, lower power and more system robustness can be achieved by performaing these functions in the RTCC and allowing the MCU to sleep for longer periods of time.