|
|
PDF MCP79412 Data sheet ( Hoja de datos )
| Número de pieza | MCP79412 | |
| Descripción | (MCP79410 - MCP79412) Real-Time Clock/Calendar | |
| Fabricantes | Microchip | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MCP79412 (archivo pdf) en la parte inferior de esta página. Total 64 Páginas | ||
|
No Preview Available !
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
1 page  
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
5 Page 
MCP79410/MCP79411/MCP79412
5.0 FUNCTIONAL DESCRIPTION
The MCP7941X is a highly-integrated Real-Time
Clock/Calendar (RTCC). Using an on-board, low-
power oscillator, the current time is maintained in sec-
onds, minutes, hours, day of week, date, month, and
year. The MCP7941X also features 64 bytes of general
purpose SRAM, 1 Kbit of EEPROM and eight bytes of
protected EEPROM. Two alarm modules allow inter-
rupts to be generated at specific times with flexible
comparison options. Digital trimming can be used to
compensate for inaccuracies inherent with crystals.
Using the backup supply input and an integrated power
switch, the MCP7941X will automatically switch to
backup power when primary power is unavailable,
allowing the current time and the SRAM contents to be
maintained. The time-stamp module captures the time
when primary power is lost and when it is restored.
The RTCC configuration and STATUS registers are
used to access all of the modules featured on the
MCP7941X.
5.1 Memory Organization
The MCP7941X features four different blocks of mem-
ory: the RTCC registers, general purpose SRAM, 1 Kbit
EEPROM with software write-protect, and protected
EEPROM. The RTCC registers and SRAM share the
same address space, accessed through the
‘1101111X’ control byte. The EEPROM regions are in
a separate address space and are accessed using the
‘1010111X’ control byte (Figure 5-1). Unused loca-
tions are not accessible. The MCP7941X will not
acknowledge if the address is out of range, as shown
in the shaded region of the memory map in Figure 5-1.
The RTCC registers are contained in addresses 0x00-
0x1F. Table 5-1 shows the detailed RTCC register map.
There are 64 bytes of user-accessible SRAM, located
in the address range 0x20-0x5F. The SRAM is a sepa-
rate block from the RTCC registers. All RTCC registers
and SRAM locations are maintained while operating
from backup power.
The EEPROM space is located in addresses 0x00-
0x7F while the protected EEPROM section is located in
addresses 0xF0-0xF7. A STATUS register, used to pro-
tect regions of the EEPROM section, is located at
address 0xFF.
2010-2014 Microchip Technology Inc.
DS20002266F-page 11
Free Datasheet http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 64 Páginas | |
| PDF Descargar | [ Datasheet MCP79412.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MCP79410 | (MCP79410 - MCP79412) Real-Time Clock/Calendar | Microchip |
| MCP79411 | (MCP79410 - MCP79412) Real-Time Clock/Calendar | Microchip |
| MCP79412 | (MCP79410 - MCP79412) Real-Time Clock/Calendar | Microchip |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |