|
|
PDF MCP79400 Data sheet ( Hoja de datos )
| Número de pieza | MCP79400 | |
| Descripción | I2C Real-Time Clock Calendar | |
| Fabricantes | MICROCHIP | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MCP79400 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
MCP79400/MCP79401/MCP79402
Battery-Backed I2C Real-Time Clock/Calendar with
SRAM and Protected EEPROM
Device Selection Table
Part Number
MCP79400
MCP79401
MCP79402
Protected EEPROM
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
• 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 battery backup: 925 nA at
3.0V
• Automatic Switchover to Battery Backup
User Memory
• 64-Byte Battery-Backed SRAM
• 64-Bit Protected EEPROM Area:
- Robust write unlock sequence
- EUI-48™ MAC address (MCP79401)
- EUI-64™ MAC address (MCP79402)
- Custom programming available
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 MCP7940X 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
MCP7940X 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 MCP7940X 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
back-up 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 MCP7940X features 64 bits of EEPROM which is
only writable after an unlock sequence, making it ideal
for storing a unique ID or other critical information. The
MCP79401 and MCP79402 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 1
X2 2
VBAT 3
VSS 4
8 VCC
7 MFP
6 SCL
5 SDA
2011-2016 Microchip Technology Inc.
DS20005009F-page 1
1 page  
MCP79400/MCP79401/MCP79402
TABLE 1-1: 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
2 THIGH Clock High Time
3 TLOW Clock Low Time
4 TR SDA and SCL Rise Time
(Note 1)
5 TF SDA and SCL Fall Time
(Note 1)
6 THD:STA Start Condition Hold Time
7 TSU:STA Start Condition Setup Time
8 THD:DAT Data Input Hold Time
9 TSU:DAT Data Input Setup Time
10 TSU:STO Stop Condition Setup Time
11 TAA Output Valid from Clock
12 TBUF Bus Free Time: Bus time
must be free before a new
transmission can start
—
—
4000
600
4700
1300
—
—
—
—
4000
600
4700
600
0
250
100
4000
600
—
—
4700
1300
— 100 kHz 1.8V ≤ VCC < 2.5V
— 400 kHz 2.5V ≤ VCC ≤ 5.5V
— — ns 1.8V ≤ VCC < 2.5V
— — ns 2.5V ≤ VCC ≤ 5.5V
— — ns 1.8V ≤ VCC < 2.5V
— — ns 2.5V ≤ VCC ≤ 5.5V
— 1000 ns 1.8V ≤ VCC < 2.5V
— 300 ns 2.5V ≤ VCC ≤ 5.5V
— 1000 ns 1.8V ≤ VCC < 2.5V
— 300 ns 2.5V ≤ VCC ≤ 5.5V
— — ns 1.8V ≤ VCC < 2.5V
— — ns 2.5V ≤ VCC ≤ 5.5V
— — ns 1.8V ≤ VCC < 2.5V
— — ns 2.5V ≤ VCC ≤ 5.5V
— — ns Note 2
— — ns 1.8V ≤ VCC < 2.5V
— — ns 2.5V ≤ VCC ≤ 5.5V
— — ns 1.8V ≤ VCC < 2.5V
— — ns 2.5V ≤ VCC ≤ 5.5V
— 3500 ns 1.8V ≤ VCC < 2.5V
— 900 ns 2.5V ≤ VCC ≤ 5.5V
— — ns 1.8V ≤ VCC < 2.5V
— — ns 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
16
17
18
19
Note 1:
2:
3:
TFVCC VCC Fall Time
300 — — µs Note 1
TRVCC VCC Rise Time
0 — — µs Note 1
FOSC Oscillator Frequency
—
32.768 —
kHz
TOSF Oscillator Timeout Period
1 — — ms Note 1
Endurance
1M — — cycles Page Mode,
25°C,VCC = 5.5V
(Note 3)
Not 100% tested.
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.
This parameter is not tested but ensured by characterization.
2011-2016 Microchip Technology Inc.
DS20005009F-page 5
5 Page 
MCP79400/MCP79401/MCP79402
5.0 FUNCTIONAL DESCRIPTION
The MCP7940X is a highly-integrated Real-Time
Clock/Calendar (RTCC). Using an on-board, low-power
oscillator, the current time is maintained in seconds,
minutes, hours, day of week, date, month, and year. The
MCP7940X also features 64 bytes of general purpose
SRAM and eight bytes of protected EEPROM. Two
alarm modules allow interrupts 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 MCP7940X 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 MCP7940X.
FIGURE 5-1:
MEMORY MAP
0x00
0x06
0x07
0x09
0x0A
0x10
0x11
0x17
0x18
0x1F
0x20
RTCC Registers/SRAM
Time and Date
Configuration and Trimming
Alarm 0
Alarm 1
Power-Fail Time-Stamp
SRAM (64 Bytes)
0x5F
0x60
Unimplemented; device does not ACK
0xFF
I2C Address: 1101111x
5.1 Memory Organization
The MCP7940X features three different blocks of
memory: the RTCC registers, general purpose SRAM,
and protected EEPROM. The RTCC registers and
SRAM share the same address space, accessed
through the ‘1101111X’ control byte. The protected
EEPROM is in a separate address space and is
accessed using the ‘1010111X’ control byte
(Figure 5-1). Unused locations are not accessible. The
MCP7940X 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
separate block from the RTCC registers. All RTCC
registers and SRAM locations are maintained while
operating from backup power.
The protected EEPROM section is located in addresses
0xF0-0xF7.
0x00
EEPROM
Unimplemented; device does not ACK
0xEF
0xF0
0xF7
0xF8
0xFF
Protected EEPROM (8 Bytes)
EUI-48/EUI-64 Node Address
Unimplemented; device does not ACK
I2C Address: 1010111x
2011-2016 Microchip Technology Inc.
DS20005009F-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MCP79400.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MCP79400 | I2C Real-Time Clock Calendar | MICROCHIP |
| MCP79401 | I2C Real-Time Clock Calendar | MICROCHIP |
| MCP79402 | I2C Real-Time Clock Calendar | MICROCHIP |
| MCP7940M | 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 |