MCP79411 Datasheet PDF - Microchip
| Part Number | MCP79411 | |
| Description | (MCP79410 - MCP79412) Real-Time Clock/Calendar | |
| Manufacturers | Microchip | |
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MCP79410/MCP79411/MCP79412
Battery-Backed I2C™ Real-Time Clock/Calendar with
SRAM, EEPROM and Protected EEPROM
Device Selection Table
Part Number
Protected EEPROM
MCP79410
MCP79411
MCP79412
Unprogrammed
EUI-48™
EUI-64™
Timekeeping Features:
• Real-Time Clock/Calendar (RTCC):
- Hours, minutes, seconds, day of week, day,
month, year
- Leap year compensated to 2399
- 12/24 hour modes
• Oscillator for 32.768 kHz Crystals:
- Optimized for 6-9 pF crystals
• On-Chip Digital Trimming/Calibration:
- ±1 PPM resolution
- ±129 PPM range
• Dual Programmable Alarms
• Versatile Output Pin:
- Clock output with selectable frequency
- Alarm output
- General purpose output
• Power-Fail Time-Stamp:
- Time logged on switchover to and from
Battery mode
Low-Power Features:
• Wide Voltage Range:
- Operating voltage range of 1.8V to 5.5V
- Backup voltage range of 1.3V to 5.5V
• Low Typical Timekeeping Current:
- Operating from VCC: 1.2 µA at 3.3V
- Operating from VBAT: 925 nA at 3.0V
• Automatic Switchover to Battery Backup
User Memory:
• 64-byte Battery-Backed SRAM
• 1 Kbit EEPROM Memory:
- Software write-protect
- Page write up to 8 bytes
- Endurance: 1M Erase/Write cycles
• 64-bit Protected EEPROM Area:
- Robust write unlock sequence
- EUI-48™ MAC address (MCP79411)
- EUI-64™ MAC address (MCP79412)
Operating Ranges:
• 2-Wire Serial Interface, I2C™ Compatible
- I2C clock rate up to 400 kHz
• Temperature Range:
- Industrial (I): -40°C to +85°C
Packages:
• 8-Lead SOIC, MSOP, TSSOP and 2x3 TDFN
General Description:
The MCP7941X Real-Time Clock/Calendar (RTCC)
tracks time using internal counters for hours, minutes,
seconds, days, months, years, and day of week.
Alarms can be configured on all counters up to and
including months. For usage and configuration, the
MCP7941X supports I2C communications up to 400
kHz.
The open-drain, multi-functional output can be
configured to assert on an alarm match, to output a
selectable frequency square wave, or as a general
purpose output.
The MCP7941X is designed to operate using a 32.768
kHz tuning fork crystal with external crystal load
capacitors. On-chip digital trimming can be used to
adjust for frequency variance caused by crystal
tolerance and temperature.
SRAM and timekeeping circuitry are powered from the
backup supply when main power is lost, allowing the
device to maintain accurate time and the SRAM
contents. The times when the device switches over to
the back-up supply and when primary power returns
are both logged by the power-fail time-stamp.
The MCP7941X features 1 Kbit of internal nonvolatile
EEPROM with software write-protectable regions.
There is an additional 64 bits of protected nonvolatile
memory which is only writable after an unlock
sequence, making it ideal for storing a unique ID or
other critical information. The MCP79411 and
MCP79412 are pre-programmed with EUI-48 and EUI-
64 addresses, respectively. Custom programming is
also available.
Package Types
SOIC, TSSOP, MSOP
X1
X2
VBAT
VSS
1
2
3
4
8 VCC
7 MFP
6 SCL
5 SDA
TDFN
X1
X2
VBAT
VSS
1
2
3
4
8 VCC
7 MFP
6 SCL
5 SDA
2010-2014 Microchip Technology Inc.
DS20002266F-page 1
Free Datasheet http://www.Datasheet4U.com
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MCP79410/MCP79411/MCP79412
TABLE 1-2: AC CHARACTERISTICS
AC CHARACTERISTICS
Electrical Characteristics:
Industrial (I):
VCC = +1.8V to 5.5V
TA = -40°C to +85°C
Param.
No.
Symbol
Characteristic
Min.
Typ. Max. Units
Conditions
1
FCLK
Clock frequency
— — 100 kHz 1.8V VCC < 2.5V
— — 400
2.5V VCC 5.5V
2 THIGH Clock high time
4000
600
— — ns 1.8V VCC < 2.5V
——
2.5V VCC 5.5V
3 TLOW Clock low time
4700
1300
— — ns 1.8V VCC < 2.5V
——
2.5V VCC 5.5V
4 TR SDA and SCL rise time
(Note 1)
— — 1000 ns 1.8V VCC < 2.5V
— — 300
2.5V VCC 5.5V
5 TF SDA and SCL fall time
(Note 1)
— — 1000 ns 1.8V VCC < 2.5V
— — 300
2.5V VCC 5.5V
6 THD:STA Start condition hold time
4000
600
— — ns 1.8V VCC < 2.5V
——
2.5V VCC 5.5V
7 TSU:STA Start condition setup time
4700
600
— — ns 1.8V VCC < 2.5V
——
2.5V VCC 5.5V
8 THD:DAT Data input hold time
0 — — ns (Note 3)
9 TSU:DAT Data input setup time
250 — — ns 1.8V VCC < 2.5V
100 — —
2.5V VCC 5.5V
10 TSU:STO Stop condition setup time
4000
600
— — ns 1.8V VCC < 2.5V
——
2.5V VCC 5.5V
11 TAA Output valid from clock
— — 3500 ns 1.8V VCC < 2.5V
— — 900
2.5V VCC 5.5V
12 TBUF Bus free time: Time the bus 4700
must be free before a new
1300
transmission can start
— — ns 1.8V VCC < 2.5V
——
2.5V VCC 5.5V
13 TSP
Input filter spike suppression
(SDA and SCL pins)
—
— 50 ns (Note 1)
14 TWC Write cycle time (byte or
page)
— — 5 ms —
15 TFVCC VCC fall time
300 — — s (Note 1)
16 TRVCC VCC rise time
0 — — s (Note 1)
17 FOSC Oscillator frequency
—
32.768 —
kHz —
18
TOSF
Oscillator timeout period
1 — — ms (Note 1)
19 —
Endurance
1M — — cycles Page Mode, 25°C,
VCC = 5.5V (Note 2)
Note 1: Not 100% tested.
2: This parameter is not tested but ensured by characterization.
3: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
2010-2014 Microchip Technology Inc.
DS20002266F-page 5
Free Datasheet http://www.Datasheet4U.com
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for MCP79411 electronic component. |
| Information | Total 30 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ MCP79411.PDF Datasheet ] | |
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