M41T00AUDD1F Datasheet M41T00AUDD1F | P4-P6

List of tables M41T00AUD

4/42 Doc ID 13480 Rev 5

List of tables

Table 1. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 2. List of registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 3. AC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4. M41T00AUD register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 5. Priority for IRQ

/FT/OUT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 6. Digital calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 7. MUTE and GAIN values (V

= 3.3 V and ambient temperature = 25 °C). . . . . . . . . . . . . 29

Table 8. Initial values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 9. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 10. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 11. Input/output characteristics (25 °C, f = 1 MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 12. DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 13. Crystal electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 14. RTC power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 15. RTC power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 16. Audio section electrical characteristics, valid for V

= 3.3 V and

AMB

= 25 °C (except where otherwise noted) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Table 17. DFN16 (5 mm x 4 mm) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 18. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 19. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

M41T00AUD List of figures

Doc ID 13480 Rev 5 5/42

List of figures

Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 2. Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 3. Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 4. Typical hookup example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 5. Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 6. Acknowledgement sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 7. Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 8. Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 9. READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 10. Alternate READ mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 11. WRITE mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 12. Counter update diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 13. Switchover thresholds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 14. Trickle charge circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 15. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 16. Audio section diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 17. AC testing input/output waveform. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 18. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 19. DFN16 (5 mm x 4 mm) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 20. DFN16 (5 mm x 4 mm) footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Description M41T00AUD

6/42 Doc ID 13480 Rev 5

1 Description

The M41T00AUD is a low-power serial real-time clock (RTC) with an integral audio section

with tone generator and 300 mW output amplifier. The RTC is a superset of the M41T00

with enhancements such as a precision reference for switchover, an oscillator fail detect

circuit, and storing of the time at power-down. The audio section includes a summing

amplifier (inverting) at the input. An 8 kHz low-pass filter follows that with a 16-step

programmable gain stage next. A 256 or 512 Hz audio tone can be switched into the filter in

place of the input signal. From the gain stage, the 300 mW amplifier drives the output pins.

The M41T00AUD has a built-in power sense circuit which detects power failures and

automatically switches to the backup input when V

is removed. Backup power can be

supplied by a capacitor or by a battery such as a lithium coin cell. The device includes a

trickle charge circuit for charging the capacitor.

The RTC includes a built-in 32.768 kHz oscillator controlled by an external crystal. Eight

M41T00. Two additional registers control the audio section and the trickle charger. The 10

registers (see Tabl e 2 ) are accessed over a 400 kHz I

C bus. The address register

increments automatically after each byte READ or WRITE operation thus streamlining

transfers by eliminating the need to send a new address for each byte to be transferred.

Typical data retention times will be in excess of 5 years with a 50 mAh 3 V lithium cell (see

RTC DC characteristics, Ta bl e 1 2 for more information).

Figure 1. Logic diagram

OSCI

M41T00AUD

SCL

OSCO

IRQ/FT/OUT

SDA

BIAS

AIN

BACK

AOUT+

AOUT –

FBK

ai13322

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P39 P40-P42

M41T00AUDD1F

Mfr. #:

Buy M41T00AUDD1F

Manufacturer:

STMicroelectronics

Description:

Real Time Clock SERIAL RTC W/AUDIO

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

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M41T00AUDD1F