MCP79410 Datasheet, PDF (1/38 Pages) Microchip Technology – I2C™ Real-Time Clock/Calendar with EEPROM, SRAM, Unique ID and Battery Switchover

MCP79410/MCP79411/MCP79412
I²C™ Real-Time Clock/Calendar with EEPROM, SRAM,
Unique ID and Battery Switchover
Device Selection Table
Part
Number
EEPROM
(Kbits)
SRAM
(Bytes)
Unique ID
MCP79410
1K
MCP79411
1K
MCP79412
1K
64
Blank
64
EUI-48^™
64
EUI-64^™
Features:
• Real-Time Clock/Calendar (RTCC), Battery
Backed:
- Hours, Minutes, Seconds, Day of Week, Day,
Month and Year
- Dual alarm with single output
• On-Chip Digital Trimming/Calibration:
- Range -127 to +127 ppm
- Resolution 1 ppm
• Programmable Open-Drain Output Control:
- CLKOUT with 4 selectable frequencies
- Alarm output
• 64 Bytes SRAM, Battery Backed
• 1 Kbits EEPROM (128x8):
- 8 bytes/page
- Block/sector write protection
- Protect none, 1/4, 1/2 or all of array
• Separate 64-Bit Unique ID:
- User or factory programmable
- Protected area
- EUI-48^™ or EUI-64^™ MAC address
- Custom ID programming
• Automatic VCC Switchover to VBAT Backup
Supply
• Power-Fail Time-Stamp for Battery Switchover
• Low-Power CMOS Technology:
- Dynamic Current: 400 A max read
- Dynamic Current: 3mA max EEPROM write
- Battery Backup Current: <700nA @ 1.8V
• 100 kHz and 400 kHz Compatibility
• ESD Protection >4,000V
• More than 1 Million Erase/Write Cycles
• Packages include 8-Lead SOIC, TSSOP, 2x3
TDFN, MSOP
• Pb-Free and RoHS Compliant
• Temperature Ranges:
- Industrial (I): -40°C to +85°C.
Description:
The MCP7941X series of low-power Real-Time Clocks
(RTC) uses digital timing compensation for an accurate
clock/calendar, a programmable output control for
versatility, a power sense circuit that automatically
switches to the backup supply, and nonvolatile memory
for data storage. Using a low-cost 32.768 kHz crystal,
it tracks time using several internal registers. For
communication, the MCP7941X uses the I²C™ bus.
The clock/calendar automatically adjusts for months
with fewer than 31 days, including corrections for
leap years. The clock operates in either the 24-hour
or 12-hour format with an AM/PM indicator and
settable alarm(s) to the second, minute, hour, day of
the week, date or month. Using the programmable
CLKOUT, frequencies of 32.768, 8.192 and 4.096
kHz and 1 Hz can be generated from the external
crystal.
Along with the on-board Serial EEPROM and battery-
backed SRAM memory, a 64-bit protected space is
available for a unique ID or MAC address to be
programmed at the factory or by the end user.
The device is fully accessible through the serial
interface while VCC is between 1.8V and 5.5V, but can
operate down to 1.3V for timekeeping and SRAM
retention only.
The RTC series of devices are available in the standard
8-lead SOIC, TSSOP, MSOP and 2x3 TDFN packages.
Package Types
MSOP
X1 1
8 VCC
X2 2
7
V_BAT 3
6
VSS 4
5
SOIC, TSSOP
X1 1
8
X2 2
7
V_BAT
3
6
VSS 4
5
MFP
SCL
X1 1
SDA
X2 2
VBAT ₃
VSS 4
TDFN
8 VCC
7 MFP
6 SCL
5 SDA
VCC
MFP
SCL
SDA
 2011 Microchip Technology Inc.
Preliminary
DS22266B-page 1