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PDF M41T60 Data sheet ( Hoja de datos )
| Número de pieza | M41T60 | |
| Descripción | Serial Access Real-Time Clock | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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M41T60
Serial Access Real-Time Clock
FEATURES SUMMARY
■ 350nA TIMEKEEPING CURRENT @ 3V
■ TIMEKEEPING DOWN TO 1.0V
■ 1.3V TO 3.6V I2C BUS OPERATING
VOLTAGE
■ COUNTERS FOR SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEARS, AND
CENTURY
■ SERIAL INTERFACE SUPPORTS I2C BUS
(400kHz)
■ SOFTWARE CLOCK CALIBRATION
■ LOW OPERATING CURRENT OF 35µA
■ OSCILLATOR STOP DETECTION
■ AUTOMATIC LEAP YEAR COMPENSATION
■ SOFTWARE PROGRAMMABLE OUTPUT
(OUT)
■ OPERATING TEMPERATURE OF –40 TO
85°C
■ LEAD-FREE 16-PIN QFN PACKAGE
■ TOTAL SURFACE AREA OF IC AND 32KHz
CRYSTAL IS 21.5mm2
Figure 1. Package
QFN16 (Q)
Figure 2. 32KHz Crystal + QFN16 vs. VSOJ20
VSOJ20 (47.6mm2)
GND Plane Guard Ring (21.5mm2)
SMT
CRYSTAL
1 XI
2 XO
3
4 ST QFN16
AI11107
Figure 3. 16-pin QFN Connections
Note: 1. Open Drain Output.
16 15 14 13
XI 1
12 NC
XO 2
11 OFIRQ/OUT(1)
VSS 3
10 SCL
FT(1) 4
9 SDA
5678
AI08870
May 2005
1/23
1 page  
Figure 5. Block Diagram
XI
OSCILLATOR
32.768 kHz
XO
VCC
VSS
SCL
SDA
SERIAL
BUS
INTERFACE
DIVIDER
CONTROL
LOGIC
ADDRESS
REGISTER
FT
1 Hz
OUT
OFIE
OSCILLATOR
FAIL DETECT
SECONDS
MINUTES
HOURS
DAY
DATE
CENTURY/
MONTH
YEAR
CALIBRATION
M41T60
FT(1)
OFIRQ/OUT(1)
Note: 1. Open drain output.
Figure 6. Hardware Hookup for Battery Back-up Operation
VCC
Note: 1. Open drain output.
M41T60
VCC
OFIRQ/OUT(1)
XI FT(1)
XO SCL
VSS
SDA
AI08871
MCU
VCC
Port
Port
Serial Clock Line
Serial Data Line
AI10476
5/23
5 Page 
M41T60
– The second approach is better suited to a
manufacturing environment, and involves the
use of the Frequency Test (FT) pin. The FT pin
will toggle at 512Hz when the ST Bit is set to
'0,' and the OUT Bit and FT Bit are set to '1.'
Any measured deviation from the 512Hz
frequency indicates the degree and direction
of oscillator frequency shift at the test
temperature. For example, a reading of
512.010124Hz would indicate a +20 ppm
oscillator frequency error, requiring a –10
(XX001010) to be loaded into the Calibration
Byte for correction.
Note: Setting or changing the Calibration Byte
does not affect the Frequency Test output
frequency. the FT pin is an open drain pin
which requires a pull-up resistor to VCC for
proper operation. A 500-10k resistor is
recommended in order to control the rise time.
Table 2. Register Map
Data
Address
D7 D6 D5 D4 D3 D2 D1
0 ST
10 Seconds
Seconds
1 OFIE
10 Minutes
Minutes
2 0 0 10 Hours
Hours
3 00000
Day
4 0 0 10 Date
Date
5
CB1 CB0
0 10 M.
Month
6 10 Years
Years
7
OUT
FT
S
Calibration
D0
Keys: 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
Function/Range
BCD Format
Seconds
00-59
Minutes
00-59
Hours
00-23
Day 01-07
Date
01-31
Century/Month 0-3/01-12
Year
00-99
Calibration
11/23
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet M41T60.PDF ] | |
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