M41T60_10 Datasheet, PDF (5/27 Pages) STMicroelectronics – Serial access real-time clock

M41T60
1
Description
Description
The M41T60 is a low power serial RTC with a built-in 32.768 kHz oscillator (external crystal
controlled). Eight registers are used for the clock/calendar function and are configured in
binary coded decimal (BCD) format. Addresses and data are transferred serially via a two-
line bi-directional bus. The built-in address register is increased automatically after each
WRITE or READ data byte.
The eight clock address locations contain the century, year, month, date, day, hour, minute,
and second in 24-hour BCD format. Corrections for 28-, 29- (leap year), 30-, and 31-day
months are made automatically.
The M41T60 is supplied in 16-lead QFN package.
Figure 1. Logic diagram
VCC
XI
XO
SCL
SDA
M41T60
FT(1)
OFIRQ/OUT(1)
VSS
1. Open drain
Table 1. Signal names
XI
Oscillator input
XO
Oscillator output
FT
Frequency test output (open drain)
SDA
Serial data address input/output
SCL
Serial clock
OFIRQ/OUT
Oscillator fail interrupt/out output (open drain)
V_CC
Supply voltage
V_SS
Ground
Figure 2. 16-pin QFN connections
AI08869
16 15 14 13
XI 1
12 NC
XO 2
11 _OFIRQ/OUT⁽¹⁾
V_SS 3
10 SCL
FT^{(1) 4}
9 SDA
5678
AI08870
Doc ID 10396 Rev 13
5/27