MCP79401T-I/MS Microchip Technology, MCP79401T-I/MS Datasheet - Page 10

• Manufacturer Part Number: MCP79401T-I/MS
• Description: Real Time Clock I2C GP RTCC 64B SRAM EUI-48
• Manufacturer: Microchip Technology
• Series: -r
• Type: Clock/Calendarr

Specifications of MCP79401T-I/MS

• Features: Alarm, Leap Year, SRAM, Unique ID
• Memory Size: 64B
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C
• Voltage - Supply: 1.8 V ~ 5.5 V
• Voltage - Supply, Battery: 1.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MCP7940X
4.0
The MCP7940X family is a highly integrated RTCC.
On-board time and date counters are driven from a low-
power oscillator to maintain the time and date. An
integrated V
the time and date and also the contents of the SRAM
during a V
4.1
The RTCC registers are contained in addresses
0x00h-0x1fh. 64 bytes of user-accessable SRAM are
located in the address range 0x20-0x5f. The SRAM
memory is a separate block from the RTCC control
and Configuration registers. All SRAM locations are
battery-backed-up during a V
locations are not accessible, MCP7940X will noACK
after the address byte if the address is out of range.
The shaded areas are not implemented and read as
‘0’. No error checking is provided when loading time
and date registers.
TABLE 4-1:
DS25009A-page 10
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
Address
RTCC FUNCTIONALITY
RTCC MEMORY MAP
ST
OUT
ALM0POL
ALM1POL
CC
CC
Bit 7
power failure.
switch enables the device to maintain
RTCC MEMORY MAP
12/24
SQWE
12/24
ALM0C2
12/24
ALM1C2
12/24
Day
Bit 6
10 Year
CC
10 Seconds
UNIQUE UNLOCK ID SEQUENCE
10 Seconds
10 Seconds
10 Minutes
10 Hour
AM/PM
OSCON
LP
ALM1
10 Minutes
10 Hour
AM/PM
ALM0C1
10 Minutes
10 Hour
AM/PM
ALM1C1
10 Minutes
10 Hour
AM/PM
Bit 5
power fail. Unused
Reserved – Do not use
Reserved – Do not use
10 Date
10 Date
10 Date
10 Date
CALIBRATION
10 Hour
V
10 Month
ALM0
10 Hours
ALM0C0
10 Month
10 Hours
ALM1C0
10 Month
10 Hours
10 Month
BAT
Bit 4
VBATEN
EXTOSC RS2
ALM0IF
ALM1IF
Bit 3
Bit 2
Seconds
Seconds
Seconds
Minutes
Minutes
Minutes
Minutes
Month
Month
Month
Month
Hour
Date
Hour
Date
Hour
Date
Hour
Date
Year
• Addresses 0x00h-0x06h are the RTCC Time and
• Incorrect data can appear in the Time and Date
• Addresses 0x07h-0x09h are the device Configu-
• Addresses 0x0Ah-0x10h are the Alarm 0 regis-
• Addresses 0x11h-0x17h are the same as 0x0Bh-
• Addresses 0x18h-0x1Fh are used for the time-
The Memory Map is shown in
Date registers. These are read/write registers.
Care must be taken when writing to these regis-
ters while the oscillator is running.
registers if a write is attempted during the time-
frame where these internal registers are being
incremented. The user can minimize the likeli-
hood of data corruption by insuring that any writes
to the Time and Date registers occur before the
contents of the second register reach a value of
0x59H.
ration, Calibration and ID Unlock registers.
ters. These are used to set up the Alarm 0, the
Interrupt polarity and the Alarm 0 compare.
0x11h but are used for Alarm 1.
stamp feature.
RS1
Bit 1
Day
Day
Day
RS0
Bit 0
Seconds
Minutes
Hours
Day
Date
Month
Year
Control Reg.
Calibration
Unlock ID
Seconds
Minutes
Hours
Day
Date
Month
Reserved
Seconds
Minutes
Hours
Day
Date
Month
Reserved
Function
 2011 Microchip Technology Inc.
Table
00-59
00-59
1-12 + AM/PM
00 - 23
1-7
01-31
01-12
00-99
00-59
00 - 59
1-12 + AM/PM
00-23
1-7
01-31
01-12
00-59
00-59
1-12 + AM/PM
00-23
1-7
01-31
01-12
4-1.
Range
Reset
State
00h
00h
00h
01h
01h
01h
01h
80h
00h
00h
00h
00h
00h
01h
01h
01h
01h
00h
00h
00h
01h
01h
01h
01h
00h
00h
00h
00h