M4T28-BR12SH1 STMicroelectronics, M4T28-BR12SH1 Datasheet - Page 12

• Manufacturer Part Number: M4T28-BR12SH1
• Description: IC SNAPHAT BATT/CRYSTAL 28-SOIC
• Manufacturer: STMicroelectronics

Specifications of M4T28-BR12SH1

• Battery Type: Li-(CF)
• Operating Supply Voltage: 0 V to 2.8 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Package / Case: SOIC-28
• Mounting Style: SMD/SMT
• Ic Function: Timekeeper (Battery & Crystal)
• Supply Voltage Range: 2.8V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: SNAPHAT
• No. Of Pins: 28
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• External Depth: 14.99mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3686-5

Operation modes
12/29
Also, as V
2.5 V, an internal battery not OK (BOK) flag will be set. The BOK flag can be checked after
power up. If the BOK flag is set, the first WRITE attempted will be blocked. The flag is
automatically cleared after the first WRITE, and normal RAM operation resumes.
illustrates how a BOK check routine could be structured.
For more information on battery storage life refer to the application note AN1012.
Figure 8.
CC
Checking the BOK flag status
rises, the battery voltage is checked. If the voltage is less than approximately
(BATTERY OK)
COMPLEMENT BACK
TO SAME ADDRESS
Doc ID 6845 Rev 8
AT ANY ADDRESS
WRITE ORIGINAL
ADDRESS AGAIN
SAME ADDRESS
DATA BACK TO
COMPLEMENT
WRITE DATA
POWER-UP
READ DATA
READ DATA
CONTINUE
AT SAME
OF FIRST
IS DATA
READ?
YES
NO
OF LOW BATTERY
(BATTERY LOW)
NOTIFY SYSTEM
CORRUPTED)
(DATA MAY BE
M48T35AV
Figure 8
AI00607