M41T94MQ6TR STMicroelectronics, M41T94MQ6TR Datasheet - Page 25

• Manufacturer Part Number: M41T94MQ6TR
• Description: Real Time Clock Advanced Analog
• Manufacturer: STMicroelectronics

Specifications of M41T94MQ6TR

• Function: Clock, Calendar, Alarm, Timer Interrupt
• Rtc Memory Size: 64 B
• Supply Voltage (max): 5.5 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
• Package / Case: SOIC-16
• Time Format: HH:MM:SS:hh
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

M41T94
4.9
Figure 14. Crystal accuracy across temperature
Figure 15. Calibration waveform
Century bit
Bits D7 and D6 of clock register 03h contain the CENTURY ENABLE bit (CEB) and the
CENTURY bit (CB). Setting CEB to a '1' will cause CB to toggle, either from a '0' to '1' or
from '1' to '0' at the turn of the century (depending upon its initial state). If CEB is set to a '0,'
CB will not toggle.
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
Frequency (ppm)
–100
–120
–140
–160
–20
–40
–60
–80
20
0
–40
–30
–20
–10
0
10
Temperature C
T
K = –0.036 ppm/ C
F
O
F = K x (T –T
= 25 C ± 5 C
20
30
O
)
2
40
2
± 0.006 ppm/ C
50
60
2
Clock operations
70
80
AI00999b
AI00594B
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