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M40ZTHSMQ1F ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 11 Page - STMicroelectronics

๋ถ€ํ’ˆ๋ช… M40ZTHSMQ1F
์ƒ์„ธ๋‚ด์šฉ  5V or 3V NVRAM supervisor for up to 8 LPSRAMs
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M40Z300, M40Z300W
Operation
11/25
battery capacity for the SNAPHATยฎ of your choice can then be divided by this current to
determine the amount of data retention available (see Table 13 on page 23).
Caution:
Take care to avoid inadvertent discharge through VOUT and E1CON - E4CON after battery has
been attached.
For a further more detailed review of lifetime calculations, please see Application Note
AN1012.
2.3
Power-on reset output
All microprocessors have a reset input which forces them to a known state when starting.
The M40Z300/W has a reset output (RST) pin which is guaranteed to be low within tWPT of
VPFD (see Table 7). This signal is an open drain configuration. An appropriate pull-up
resistor should be chosen to control the rise time. This signal will be valid for all voltage
conditions, even when VCC equals VSS.
Once VCC exceeds the power failure detect voltage VPFD, an internal timer keeps RST low
for tREC to allow the power supply to stabilize.
2.4
Battery low pin
The M40Z300/W automatically performs battery voltage monitoring upon power-up, and at
factory-programmed time intervals of at least 24 hours. The Battery Low (BL) pin will be
asserted if the battery voltage is found to be less than approximately 2.5V. The BL pin will
remain asserted until completion of battery replacement and subsequent battery low
monitoring tests, either during the next power-up sequence or the next scheduled 24-hour
interval.
If a battery low is generated during a power-up sequence, this indicates that the battery is
below 2.5V and may not be able to maintain data integrity in the SRAM. Data should be
considered suspect, and verified as correct. A fresh battery should be installed.
If a battery low indication is generated during the 24-hour interval check, this indicates that
the battery is near end of life. However, data is not compromised due to the fact that a
nominal VCC is supplied. In order to insure data integrity during subsequent periods of
battery back-up mode, the battery should be replaced. The SNAPHATยฎ top should be
replaced with valid VCC applied to the device.
The M40Z300/W only monitors the battery when a nominal VCC is applied to the device.
Thus appli-cations which require extensive durations in the battery back-up mode should be
powered-up periodically (at least once every few months) in order for this technique to be
beneficial. Additionally, if a battery low is indicated, data integrity should be verified upon
power-up via a checksum or other technique. The BL pin is an open drain output and an
appropriate pull-up resistor to VCC should be chosen to control the rise time.
2.5
VCC noise and negative going transients
ICC transients, including those produced by output switching, can produce voltage
fluctuations, resulting in spikes on the VCC bus. These transients can be reduced if
capacitors are used to store energy which stabilizes the VCC bus. The energy stored in the
bypass capacitors will be released as low going spikes are generated or energy will be


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