MCP795W21 _ BDTIC a Leading Distributor in China

MCP795W21

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.

Features

Low Power Operation VCC Min = 1.8V Icc < 1 µA Typical Standby Current
VCC Min = 1.8V
Icc < 1 µA
Typical Standby Current
Low Backup Power VBAT Min = 1.3V Ibat < 700nA Typical Timekeeping & SRAM Retention Current
VBAT Min = 1.3V
Ibat < 700nA
Typical Timekeeping & SRAM Retention Current
Automatic Battery Switchover with Timestamp VCC to VBAT (VCC Lost) VBAT to VCC (VCC Restored)
VCC to VBAT (VCC Lost)
VBAT to VCC (VCC Restored)
Dual configurable alarms with a 0.01 sec count on one alarm IRQ (VCC or VBAT) WDO (VCC)
IRQ (VCC or VBAT)
WDO (VCC)
Clock Out frequencies: 32.768, 8.192 & 4.096 KHz and 1 Hz
Digital Trimming Range from -255 to + 255 ppm in 1 ppm steps Adjusts up to 22 seconds/day
Adjusts up to 22 seconds/day
Watchdog Timer - Dual Retriggers SPI Bus or EVHS digital input
SPI Bus or EVHS digital input
Dual Configurable Event Detects High speed with programmable pulse count (EVHS) Low speed with programmable debounce delay (EVLS)
High speed with programmable pulse count (EVHS)
Low speed with programmable debounce delay (EVLS)
EEPROM has 8 Bytes/Page with Block Sector write protection Protect: None, 1/4, 1/2 or all of array
Protect: None, 1/4, 1/2 or all of array
Factory standard MAC address programming or custom ID available

Parameter

Parameter Name Value	Value
Max Communications Speed 10 MHz	10 MHz
Pin Count 14	14
Minimum Clock Count (seconds) 0.01 sec	0.01 sec
Battery-backed SRAM (Bytes) 64	64
EEPROM (Kbits) 2	2
Unique ID (bits) 128	128
Unique ID Programming EUI-48	EUI-48
Temperature Range (C) -40 to +85	-40 to +85

Documents

MCP795W1X/MCP795W2X SPI RTCC with Enhanced Features and Battery Switchover	Data Sheets	06/21/2016	854KB
MCP795WXX Family Silicon Errata and Data Sheet Clarification	Errata	12/15/2015	70KB
AN1365 - Recommended Usage of Microchip Serial RTCC Devices	AppNote	03/28/2013	267KB
AN1412 - How to Calculate UNIX Time Using a PIC18 Microcontroller and the MCP795W20 SPI RTCC	AppNote	01/31/2012	318KB
AN1413 - Temperature Compensation of a Tuning Fork Crystal Based on MCP79410	AppNote	11/07/2011	479KB
AN1519 - Recommended Crystals for Microchip Stand-Alone Real-Time Clock/Calendar Devices	AppNote	09/16/2013	397KB
AN1564 - Configuring and Using the Event Detection Module of MCP795WXX RTCCs	AppNote	09/16/2013	305KB
AN1565 - Configuring and Using the WDT Module of MCP795WXX Real-Time Clock/Calendars	AppNote	09/16/2013	290KB
AN1950 - Configuring and Using the MCP795WXX SPI RTCC for Basic Timekeeping, Based on a PIC18	AppNote	06/08/2015	146KB
AN2027 - Backup Power Sources for Microchip's RTCCs and SRAMs	AppNote	12/01/2015	161KB
AN2140 - Configuring and Using the Alarm Module of the MCP795WXX Real-Time Clock/Calendars	AppNote	05/11/2016	154KB
TB3116 - Questions and Answers Concerning MCP79XXX Serial RTCCs	AppNote	08/11/2014	75KB
I2C & SPI Real-Time Clock/Calendar Sell Sheet	Brochures	07/21/2014	703KB

Ordering Information

Part Number	Leads	Package Type	Temp Range	Packing	1+	26+	100+	1000+	5000+
MCP795W21-I/SL	14	SOIC	-40C to +85C	TUBE	1.68	1.55	1.47	1.39	1.34
MCP795W21-I/ST	14	TSSOP	-40C to +85C	TUBE	1.72	1.59	1.51	1.42	1.38
MCP795W21T-I/SL	14	SOIC	-40C to +85C	T/R	1.68	1.55	1.47	1.39	1.34
MCP795W21T-I/ST	14	TSSOP	-40C to +85C	T/R	1.72	1.59	1.51	1.42	1.38

Similar Devices

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MCP7940M	$0.46
MCP7940N	$0.59
MCP79410	$0.72
MCP79411	$0.78
MCP79412	$0.78
MCP79510	$0.90
MCP79511	$0.96
MCP79512	$0.96
MCP79520	$0.96
MCP79521	$1.02
MCP79522	$1.02
MCP795W10	$1.22
MCP795W11	$1.28
MCP795W12	$1.28
MCP795W20	$1.28
MCP795W21	$1.34
MCP795W22	$1.34

RoHS Information

PartNumber	DeviceWeight	ShippingWeight	LeadCount	PackageType	PackageWidth	SolderComposition	JEDECIndicator
MCP795W21-I/ST	0.060000	0.125000	14	TSSOP	4.4mm	Matte Tin	e3
MCP795W21T-I/ST	0.060000	0.246800	14	TSSOP	4.4mm	Matte Tin	e3
MCP795W21-I/SL	0.143200	0.280702	14	SOIC	.150In(3.90mm)	Matte Tin	e3
MCP795W21T-I/SL	0.143200	0.325000	14	SOIC	.150In(3.90mm)	Matte Tin	e3