M41T82SQA6F datasheet, PDF - EEWORLD Datasheet

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M41T82SQA6F: Description1 TIMER(S), REAL TIME CLOCK, PDSO8; CategoryThe embedded processor and controller Microcontrollers and processors; File Size2MB，64 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/; Environmental Compliance

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M41T82SQA6F Overview

1 TIMER(S), REAL TIME CLOCK, PDSO8

M41T82SQA6F Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Parts packaging code	QFN
package instruction	HVQCCN,
Contacts	16
Reach Compliance Code	compli
ECCN code	EAR99
maximum clock frequency	0.4 MHz
External data bus width	1
Information access methods	I2C
JESD-30 code	S-XQCC-N16
length	4 mm
Number of digits	8
Number of terminals	16
Number of timers	1
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	UNSPECIFIED
encapsulated code	HVQCCN
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1 mm
Maximum supply voltage	5.5 V
Minimum supply voltage	3 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal form	NO LEAD
Terminal pitch	0.65 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	30
width	4 mm
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK
Base Number Matches	1

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M41T82, M41T83

Serial I

C bus real-time clock (RTC) with battery switchover

Datasheet

production data



Optional 2

programmable alarm available



Square wave output defaults to 32 KHz on

power-up (M41T83 only)

QFN16 (4 mm x 4 mm)



RESET (RST) output



Watchdog timer



Programmable 8-bit counter/timer



7 bytes of battery-backed user SRAM

SO8 (4.90 mm x 3.90 mm)



Battery low flag



Low operating current of 80

μA



Oscillator stop detection



Battery or SuperCap™ backup



Operating temperature of –40 °C to 85 °C

SOX18, embedded crystal

(11.61 mm x 7.62 mm)

Features



Ultra-low battery supply current of 365 nA



Factory-calibrated accuracy of

5

ppm typical

after 2 reflows (SOX18)

– Much better accuracies achievable using

built-in programmable analog and digital

calibration circuits



2.0 V to 5.5 V clock operating voltage



Counters for tenths/hundredths of seconds,

seconds, minutes, hours, day, date, month,

year, and century



Automatic switchover and reset output circuitry

(fixed reference)

– M41T83S: V

= 3.00 V to 5.50 V

– M41T83R: V

= 2.70 V to 5.50 V

– M41T83Z: V

= 2.38 V to 5.50 V



Serial interface supports I

C bus (400 kHz

protocol)



Programmable alarm with interrupt function

(valid even during battery backup mode)



Package options

– a 16-lead QFN (M41T83)

– an 8-lead SOIC (M41T82) or

– an 18-lead embedded crystal SOIC

(M41T83)



RoHS compliance: lead-free components are

compliant with the RoHS directive

June 2015

This is information on a product in full production.

DocID012578 Rev 18

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www.st.com

Contents

M41T82, M41T83

Contents

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.1

2-wire bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.1.1

2.1.2

2.1.3

2.1.4

2.1.5

Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Start data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Stop data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Data valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.2

2.3

2.4

2.5

Read mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Write mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Data retention and battery switchover (V

= V

RST

) . . . . . . . . . . . . . . . . 18

Power-on reset (t

rec

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.1

Clock data coherency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.1.1

3.1.2

Example of incoherency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Accessing the device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Power-down time-stamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.2

3.3

3.4

Halt bit (HT) operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.2.1

Real-time clock accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.4.1

3.4.2

3.4.3

Digital calibration (periodic counter correction) . . . . . . . . . . . . . . . . . . . 28

Analog calibration (programmable load capacitance) . . . . . . . . . . . . . . 31

Pre-programmed calibration value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.5

3.6

3.7

3.8

Setting the alarm clock registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Optional second programmable alarm and user SRAM . . . . . . . . . . . . . . 37

Watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

8-bit (countdown) timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.8.1

3.8.2

3.8.3

3.8.4

M41T83 timer interrupt/output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Timer flag (TF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Timer interrupt enable (TIE, M41T83 only) . . . . . . . . . . . . . . . . . . . . . . 40

Timer enable (TE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

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Contents

TD1/0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.9

3.10

3.11

3.12

3.13

3.14

Square wave output (M41T83 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Battery low warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Century bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Oscillator fail detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Oscillator fail interrupt enable (M41T83 only) . . . . . . . . . . . . . . . . . . . . . . 44

IRQ1/FT/OUT pin, frequency test, interrupts and the OUT bit (M41T83 only)

3.14.1

3.14.2

Active mode operation on V

CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Backup mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.15

3.16

3.17

FT/RST pin, frequency test and reset output pin (M41T82 only) . . . . . . . 48

Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

OTP bit operation (M41T83 in SOX18 package only) . . . . . . . . . . . . . . . 49

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

6.1

6.2

6.3

6.4

QFN16 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

SOX18 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

SO8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Carrier tape information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

DocID012578 Rev 18

3/64

List of tables

M41T82, M41T83

List of tables

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 8.

Table 9.

Table 10.

Table 11.

Table 12.

Table 13.

Table 14.

Table 15.

Table 16.

Table 17.

Table 18.

Table 19.

Table 20.

Table 21.

Table 22.

Table 23.

Table 24.

Table 25.

Table 26.

Table 27.

Table 28.

Table 29.

Table 30.

Table 31.

Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

M41T82 clock/control register map (32 bytes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Key to

Table 2: M41T82 clock/control register map (32 bytes).

. . . . . . . . . . . . . . . . . . . . . 24

M41T83 clock/control register map (32 bytes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Key to

Table 4: M41T83 clock/control register map (32 bytes).

. . . . . . . . . . . . . . . . . . . . . 26

Digital calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Analog calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Alarm repeat modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Watchdog register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Timer control register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Timer interrupt operation in free-running mode (with TI/TP = 1). . . . . . . . . . . . . . . . . . . . . 39

Timer source clock frequency selection (244.1

μs

to 4.25 hrs) . . . . . . . . . . . . . . . . . . . . . 40

Square wave output frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Priority for IRQ1/FT/OUT pin when operating on V

CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Priority for IRQ1/FT/OUT pin when operating in backup mode . . . . . . . . . . . . . . . . . . . . . 47

Initial power-on default values (part 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Initial power-up default values (part 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Crystal electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Oscillator characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

QFN16 – 16-lead, quad, flat package, no lead, 4 x 4 mm

package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

SOX18 – 18-lead plastic small outline, 300 mils, embedded crystal,

package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

SO8 – 8-lead plastic small outline (150 mils body width)

package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Carrier tape dimensions for QFN16, SOX18, and SO8 packages . . . . . . . . . . . . . . . . . . . 61

Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

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DocID012578 Rev 18

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List of figures

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Figure 11.

Figure 12.

Figure 13.

Figure 14.

Figure 15.

Figure 16.

Figure 17.

Figure 18.

Figure 19.

Figure 20.

Figure 21.

Figure 22.

Figure 23.

Figure 24.

Figure 25.

Figure 26.

Figure 27.

Figure 28.

Figure 29.

Figure 30.

Figure 31.

Figure 32.

Figure 33.

Figure 34.

Figure 35.

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

M41T83 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

M41T83 hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Read mode sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Alternative read mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Write mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Clock data coherency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Internal load capacitance adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Clock accuracy vs. on-chip load capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Clock divider chain and calibration circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Crystal isolation example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Timer output waveform in free-running mode (with TI/TP = 1) . . . . . . . . . . . . . . . . . . . . . . 39

Battery check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Two-bit binary counter (century bits CB1:CB0). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

IRQ1/FT/OUT output pin circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Measurement AC I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

CC2

vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Bus timing requirement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

QFN16 – 16-lead, quad, flat package, no lead, 4 x 4 mm body size

package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

QFN16 – 16-lead, quad, flat package, no lead, 4 x 4 mm, recommended footprint . . . . . . 57

32 KHz crystal + QFN16 vs. VSOJ20 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

SOX18 – 18-lead plastic small outline, 300 mils, embedded crystal package outline . . . . 59

SO8 – 8-lead plastic small package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Carrier tape for QFN16, SOX18, and SO8 packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

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High-speed current feedback operational amplifier circuit OPA603

Computer motherboard circuit diagram 810 2_26

Shortcut: L0 L1 L2 L3 L4 L5 L6 L7 L8 L9 LA LB LC LD LE LF LG LH LI LJ LK LL LM LN LO LP LQ LR LS LT LU LV LW LX LY LZ M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 MA MB MC MD ME MF MG MH MI MJ MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ N0 N1 N2 N3 N4 N5 N6 N7 N8 NA NB NC ND NE NF NG NH NI NJ NK NL NM NN NO NP NQ NR NS NT NU NV NX NZ O0 O1 O2 O3 OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OP OQ OR OS OT OV OX OY OZ P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 PA PB PC PD PE PF PG PH PI PJ PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY PZ Q1 Q2 Q3 Q4 Q5 Q6 Q8 Q9 QA QB QC QE QF QG QH QK QL QM QP QR QS QT QV QW QX QY R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 RA RB RC RD RE RF RG RH RI RJ RK RL RM RN RO RP RQ RR RS RT RU RV RW RX RY RZ

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