M41T82RM6F STMicroelectronics, M41T82RM6F Datasheet - Page 41

• Manufacturer Part Number: M41T82RM6F
• Description: IC RTC SERIAL W/BATT SW 8-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T82RM6F

• Memory Size: 32B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8279-2; M41T82RM6F

M41T82-M41T83
3.13
3.14
Figure 23. IRQ1/FT/OUT output pin circuit
Read FLAGS register
to clear
Write watchdog register
to clear
TE
Write OF to 0
to clear
The oscillator must start and have run for at least 4 seconds before attempting to reset the
OF bit to 0.
The oscillator fail detect circuit funtions during backup mode. If a triggering event occurs to
disrupt the oscillator during a power-down condition, the OF bit will be set accordingly.
Oscillator fail interrupt enable (M41T83 only)
With the OFIE bit set, the OF bit will cause the IRQ1/FT/OUT output to be asserted (see
Section 3.14.1
cleared by resetting the OF bit to 0 (NOT by reading the flags register). Clearing the OFIE bit
will also cause the IRQ1/FT/OUT output to de-assert, but if OFIE is subsequently set prior to
clearing OF, the IRQ1/FT/OUT output will assert immediately upon setting OFIE. Clearing
the OF bit is necessary to prevent such an inadvertent interrupt.
If the alarm in backup enable bit, ABE, is set (along with OFIE), the oscillator fail detect will
cause an interrupt in the IRQ1/FT/OUT pin during backup mode. For additional information
on this, refer to
IRQ1/FT/OUT pin, frequency test, interrupts and the OUT bit
(M41T83 only)
Four interrupt sources, the frequency test function, and the discrete output bit OUT all share
the IRQ1/FT/OUT pin. Priority is built into the part such that some functions dominate
others. Additionally, the priority depends on configuration bits such as OUT and ABE, and
on whether the part is operating on V
output and requires an external pull-up resistor.
Figure 23
pin.
TIMER
reload
TF
shows the various signal sources and controlling bits for the IRQ1/FT/OUT output
and
WDF
Section
AF1
OF
TI/TP
3.14.2
PRE
OFIE
3.14.2.
AI1E
TIE
Q
for additional conditions that apply). The IRQ1/FT/OUT output is
Doc ID 12578 Rev 12
WDOG
CC
or is in the backup mode. This pin is an open drain
w-dog running
OUT
ABE
FT
OFIE
A1IE
TIE
IRQ1/OUT/FT
LOGIC
Clock operation
IRQ1/OUT/FT
AM03013v1
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