M41ST87WMX6 STMicroelectronics, M41ST87WMX6 Datasheet - Page 28

• Manufacturer Part Number: M41ST87WMX6
• Description: IC SUPERVISOR RTC 160X8 28-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Supervisorr

Specifications of M41ST87WMX6

• Memory Size: 160B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC, 28-SOH (8.48mm Width)
• Function: Clock/Calendar/Alarm/Timer Interrupt
• Rtc Memory Size: 160 Byte
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial (2-Wire, I2C)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5370-5; M41ST87WMX6

Operating modes
2.11
Note:
28/54
Tamper event time-stamp
Regardless of which tamper occurs first, not only will the appropriate tamper bit be set, but
the event will also be automatically time-stamped. This is accomplished by freezing the
normal update of the clock registers (00h through 07h) immediately following a tamper
event. Thus, when tampering occurs, the user may first read the time registers to determine
exactly when the tamper event occurred, then re-enable the clock update to the current time
(and reset the tamper bit, TB
The time update will then resume and the clock can be read to determine the current time.
Both tamper enable bits (TEB
In the event of multiple tampers, the time-stamp will reflect the initial tamper event.
If the TEB
down time-stamp (see
(halt update) will not be set during the power-down event. If both are needed, the power
down time-stamp may be accomplished by writing the time into the general purpose RAM
memory space when PFO is asserted.
X
bit is set, the tamper event time-stamp will take precedence over the power
Section 3.0.1: Power-down time-stamp on page
X
X
) by resetting the tamper enable bit (TEB
Doc ID 9497 Rev 9
) must always be set to '0' in order to read the current time.
M41ST87Y, M41ST87W
X
29) and the HT bit
).