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PDF M41T83 Data sheet ( Hoja de datos )
| Número de pieza | M41T83 | |
| Descripción | (M41T82 / M41T83) Serial RTC | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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M41T82
M41T83
Serial RTC with battery switchover
Features
■ 2.0 to 5.5V clock operating voltage
■ Ultra-low battery supply current of 365nA
■ Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
■ Programmable clock calibration (analog and
digital)
■ Automatic switchover and reset output circuitry
(fixed reference)
– M41T83S
VCC = 3.00V to 5.50V
(2.85V ≤ VRST ≤ 3.00V)
– M41T83R
VCC = 2.70V to 5.50V
(2.55V ≤ VRST ≤ 2.70V)
– M41T83Z
VCC = 2.38V to 5.50V
(2.25V ≤ VRST ≤ 2.38V)
■ Serial interface supports I2C Bus (400kHz
protocol)
■ Programmable alarm with interrupt function
(valid even during battery back-up mode)
■ Optional 2nd programmable alarm available
■ Square wave output defaults to 32KHz on
power-up (M41T83 only)
■ RESET (RST) output
■ Watchdog timer
■ Programmable 8-bit counter/timer
■ 7 bytes of battery-backed user SRAM
■ Battery low flag
■ Power-down time stamp (HT bit)
■ Low operating current of 80µA
QFN16, 4mm x 4mm (QA)
(VFQFPN16)
18
1
SOX18 (MY, 18-pin, 300mil SOIC
with Embedded Crystal)1
SO8 (M)
1. Contact local ST sales office for availability of SOX18
package.
■ Oscillator stop detection
■ Battery or Super-cap™ back-up
■ Operating temperature of –40°C to 85°C
■ Package options include:
– a 16-lead QFN (M41T83),
– an 18-lead embedded crystal SOIC
(M41T83), or
– an 8-lead SOIC (M41T82)
■ RoHS compliance: lead-free components are
compliant with the RoHS directive.
March 2007
Rev 4
1/58
www.st.com
1
1 page  
M41T82 M41T83
List of figures
List of figures
Figure 1.
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Figure 22.
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Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
M41T82 logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
M41T83 logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SO8 (M) connections (M41T82) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
QFN16 (QA) connections (M41T83) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SOX18 (MY) connections (M41T83). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
M41T82 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
M41T82 hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
M41T83 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
M41T83 hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Alternative READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
WRITE mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Internal load capacitance adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Clock accuracy vs. on-chip load capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Clock divider chain and calibration circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Crystal isolation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Alarm interrupt reset waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Back-up mode alarm waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Measurement ac I/O waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Power down/up mode ac waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Bus timing requirement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
QFN16 – 16-lead, quad, flat package, no lead, 4 x 4 mm body size outline . . . . . . . . . . . 52
QFN16 – 16-lead, quad, flat package, no lead, 4 x 4 mm, recommended footprint . . . . . . 53
32KHz crystal + QFN16 vs. VSOJ20 mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
SOX18 – 18-lead plastic small outline, 300mils, embedded crystal, outline. . . . . . . . . . . . 54
SO8 – 8-lead plastic small package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
5/58
5 Page 
M41T82 M41T83
Figure 7. M41T82 hardware hookup
VCC
M41T82
VCC
XI
XO
VBAT
VSS
FT/RST(1)
SCL
SDA
1. Open drain output
Description
MCU
VCC
Reset Input
Serial Clock Line
Serial Data Line
AI11813
11/58
11 Page | ||
| Páginas | Total 58 Páginas | |
| PDF Descargar | [ Datasheet M41T83.PDF ] | |
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