M41T94MQ6E STMicroelectronics, M41T94MQ6E Datasheet - Page 25

• Manufacturer Part Number: M41T94MQ6E
• Description: IC SRAM RTC SERIAL 512B 16-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T94MQ6E

• Memory Size: 44B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Function: Clock/Calendar/Alarm/Timer Interrupt
• Rtc Memory Size: 64 Byte
• 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 (SPI)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3684; 497-3684-1; 497-3684-1; 497-3684-2; 497-3684-2

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
25/41