M41T00AUDD1E Ver la hoja de datos (PDF) - STMicroelectronics
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M41T00AUDD1E Datasheet PDF : 42 Pages
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Description
1
Description
M41T00AUD
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 VCC 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
register bytes are used for the clock/calendar functions and are superset compatible with the
M41T00. Two additional registers control the audio section and the trickle charger. The 10
registers (see Table 2) are accessed over a 400 kHz I2C 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, Table 12 for more information).
Figure 1. Logic diagram
OSCI
OSCO
SCL
SDA
AIN
VBACK
VCC
M41T00AUD
VBIAS
IRQ/FT/OUT
FBK
AOUT+
AOUT –
NC
VSS
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Doc ID 13480 Rev 5
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