M41T82_10 Datasheet, PDF (49/61 Pages) STMicroelectronics – Serial I2C bus RTC with battery switchover

M41T82-M41T83
DC and AC parameters
Figure 25. I_CC2 vs. temperature
10.000
9.000
8.000
7.000
6.000
5.000
(3.0V)
(5.0V)
4.000
3.000
2.000
-40
-20
0
20
40
60
80
Temperature (°C)
ai 13909
Table 23. Crystal electrical characteristics
Symbol
Parameter⁽¹⁾⁽²⁾
Min Typ Max Units
f_O
Resonant frequency
R_S
Series resistance
32.768
kHz
65⁽³⁾ kΩ
C_L
Load capacitance
12.5
pF
1. Externally supplied if using the QFN16 or SO8 package. STMicroelectronics recommends the Citizen CFS-
145 (1.5 x 5 mm) and the KDS DT-38 (3 x 8 mm) for thru-hole, or the KDS DMX-26S (3.2 x 8 mm) or Micro
Crystal MS3V-T1R (1.5 x 5 mm) for surface-mount, tuning fork-type quartz crystals. For contact
information, see Section 8: References on page 59.
2. Load capacitors are integrated within the M41T8x. Circuit board layout considerations for the 32.768 kHz
crystal of minimum trace lengths and isolation from RF generating signals should be taken into account.
3. Guaranteed by design.
Table 24. Oscillator characteristics
Symbol
Parameter⁽¹⁾⁽²⁾
V_STA
t_STA
C_XI, C_XO(1)
Oscillator start voltage
Oscillator start time
Capacitor input, capacitor output
IC-to-IC frequency variation⁽²⁾⁽³⁾
1. With default analog calibration value ( = 0)
2. Reference value
3. T_A = 25 °C, V_CC = 5.0 V
Conditions Min Typ Max Units
≤ 4s
2.0
V
V_CC = V_SO
1
s
25
pF
–10
+10 ppm
Doc ID 12578 Rev 12
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