MCP79401T-I/SN Microchip Technology, MCP79401T-I/SN Datasheet - Page 12

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

Specifications of MCP79401T-I/SN

• 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-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MCP7940X
• ALMxPOL: This bit specifies the level that the
• ALMxIF: This is the Alarm Interrupt Fag. This bit is
• ALMxC2:0: These Configuration bits determine
• The 12/24-hour bits 0xCh.6 and 0x13h.6 are cop-
0x18h-0x1Bh are used for the timesaver function.
These registers are loaded at the time when V
and the RTCC operates on the V
also set at this time. These registers are cleared when
the V
0x1Ch-0x1Fh are used for the timesaver function.
These registers are loaded at the time when V
restored and the RTCC switches to V
registers are cleared when the V
software.
DS25009A-page 12
000 –
001 –
010 –
011 –
100
101
110
111
MFP will drive when the alarm is triggered.
ALM2POL is a copy of ALM1POL. The default
state of the MFP when used for alarms is the
inverse of ALM1POL.
set in hardware if the alarm was triggered. The bit
is cleared in software.
the alarm match. The logic will trigger the alarm
based on one of the following match conditions:
ies of the bit in 0x02h.6. The bits are read-only.
Note:
BAT
– Date
– RESERVED
– RESERVED
– Seconds, Minutes, Hour, Day, Date,
bit is cleared in software.
It is strongly recommended that the
timesaver function only be used when the
oscillator is running. This will ensure
accurate functionality.
Seconds match
Minutes match
Hours match (takes into account 12/24
hour)
Matches the current day, interrupt at
12.00.00 a.m. Example: 12 midnight on
Month
BAT
BAT
. The V
bit is cleared in
DD
BAT
. These
CC
CC
bit is
fails
is
4.2
4.2.1
The unique ID location is user accessible by using the
unlock ID sequence.
The unique ID location is 64-bits (8 bytes) and is
stored in EEPROM locations 0xF0 to 0xF7. This
location can be read at any time, however, a write is
inhibited until unlocked.
To unlock the write access to this location the following
sequence must be completed:
• A single write of 0x55h to address 0x09. Stop
• A single write of 0xAAh to address 0x09. Stop
This will allow the unique EEPROM locations to be
written.
After the byte or page write to these locations, the
write sequence is initiated by the Stop condition. At
this time, the ID locations are locked and no further
writes are possible to this location unless a complete
unlock sequence is repeated.
FEATURES
UNLOCK SEQUENCE
 2011 Microchip Technology Inc.