Datasheet

DocID10396 Rev 14 15/28
M41T60 Clock operation
• 0 = Must be set to '0'
• CB0, CB1 = century bits
• FT = frequency test bits
• OFIE = oscillator fail interrupt enable bit
• OUT = output level
• S = sign bit
• ST = stop bit
Figure 11. Crystal accuracy across temperature
Table 2. Register map
Address
Data
Function/range
BCD format
D7 D6 D5 D4 D3 D2 D1 D0
0 ST 10 seconds Seconds Seconds 00-59
1 OFIE 10 minutes Minutes Minutes 00-59
2 0 0 10 hours Hours Hours 00-23
3 0 0 0 0 0 Day Day 01-07
4 0 0 10 date Date Date 01-31
5 CB1 CB0 0 10 M. Month Century/month 0-3/01-12
6 10 Years Years Year 00-99
7 OUT FT S Calibration Calibration
AI07888
–160
0 10203040506070
Frequency (ppm)
Temperature °C
80–10–20–30–40
–100
–120
–140
–40
–60
–80
20
0
–20
= –0.036 ppm/°C
2
± 0.006 ppm/°C
2
K
ΔF
= K x (T – T
O
)
2
F
T
O
= 25°C ± 5°C