M41ST87WMX6 STMicroelectronics, M41ST87WMX6 Datasheet - Page 12

• 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
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Operating modes
The M41ST87Y/W clock operates as a slave device on the serial bus. Access is obtained by
implementing a start condition followed by the correct slave address (D0h). The 160 bytes
contained in the device can then be accessed sequentially in the following order:
00h.
01h.
02h.
03h.
04h.
05h.
06h.
07h.
08h.
09h.
0Ah-0Eh. Alarm registers
0Fh.
10h-12h.
13h.
14h.
15h.
16h-1Dh.
1Eh-1Fh.
20h-9Fh.
The M41ST87Y/W clock continually monitors V
V
address counter. Inputs to the device will not be recognized at this time to prevent erroneous
data from being written to the device from a an out-of-tolerance system. When V
below V
ultra low current mode of operation to conserve battery life. As system power returns and
V
V
Write protection continues until t
For more information on battery storage life refer to application note AN1012.
CC
CC
CC
.
fall below V
rises above V
SO
, the device automatically switches over to the battery and powers down into an
Tenths/hundredths of a second register
Seconds register
Minutes register
Century/hours register
Day register
Date register
Month register
Year register
Control register
Watchdog register
Square wave
Tamper register 1
Tamper register 2
Flag register
Reserved
User RAM (128 bytes)
Serial number (8 bytes)
Reserved (2 bytes)
PFD
SO
, the device terminates an access in progress and resets the device
, the battery is disconnected, and the device is switched to external
Doc ID 9497 Rev 9
rec
(min) elapses after V
CC
for an out-of-tolerance condition. Should
CC
reaches V
M41ST87Y, M41ST87W
PFD
(min).
CC
falls