Datasheet

M41T94 Clock operations
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Figure 14. Crystal accuracy across temperature
Figure 15. Calibration waveform
4.9 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.
AI00999b
–160
0 10203040506070
Frequency (ppm)
Temperature °C
80–10–20–30–40
–100
–120
–140
–40
–60
–80
20
0
–20
ΔF
= K x (T –T
O
)
2
K = –0.036 ppm/°C
2
± 0.006 ppm/°C
2
T
O
= 25°C ± 5°C
F
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION