Andre Belanger
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Articles
Recent activity by Andre Belanger-
Q&A: Is the I2C input threshold voltage Vt+ and Vt-?
Full question(s): When operating the AMx805 at 2.4 V power supply voltage, what is the threshold voltage of the I2C ports? I assume that the I2C input threshold voltage is Vt+, Vt- described in "T...
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Q&A: Does AM0805 register access via the I2C interface still work if the XT oscillator is not mounted?
Full question(s): Is I2C communication possible in a system that does not have the XT oscillator? During I2C access from the host to the RTC, the ACK signal does not respond. The internal timer ...
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Q&A: Is there Eclipse IDE support for Apollo1?
Full question(s): AmbiqSuite SDK Getting Started Guide Revision 1.1 on page 15, "9. Eclipse / GCC" has the following description: "Note: The Eclipse/GCC environment is not operational due to an un...
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Q&A: Will FOUT and XT operate normally without VCC being supplied?
Full question(s): In the following scenario, there is a state where only VBAT is supplied without supplying VCC to RTC. 1.) If VCC is not supplied and only VBAT is supplied, will FOUT and XT oper...
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Q&A: If the voltage when the VBAT voltage drops is V_BATRST < VBAT, is the BL bit set correctly?
Full question(s): This question is about when the RTC transits to VBAT Power State (Fig. 29) after VCC power supply is supplied and VBAT is also supplied. Even in the VBAT Power State, if the volta...
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Q&A: How do you use TMRPINB as a clock, and what is the clock frequency?
Full question(s): These questions refer to Table 564 of Apollo2 datasheet rev1.0. In the table, TMRPINB is available as a clock source option. TMRPINB is the output signal of timer B, and it seems ...
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Q&A: When the operation of the XT oscillator returns to normal, will it be automatically changed to the XT oscillator?
Full question(s): If the FOS bit is set to 1, it automatically changes to the RC oscillator when the XT oscillator fails. Conversely, when the operation of the XT oscillator returns to normal, wil...
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Q&A: Is there an AM0805 register setting that affects the oscillator allowance of the 32 kHz crystal?
Full question(s): Is there an AM0805 register setting that affects the oscillator allowance of the 32 kHz crystal? For example, how about Bit 7 (STOP) of the Control1 Register? Answer(s): Bit ...
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Q&A: How is XT Oscillation Allowance measured?
Full question(s): How is a crystal circuit's oscillation allowance determined to ensure that it provides adequate stability? Answer(s): The AM0805 RTC crystal oscillator circuit's negative resi...
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Q&A: Is the Flash memory write operation also performed at low voltage?
Full question(s): Normal (read) Flash memory operation is done at a lower internal voltage. Is the Flash memory write operation also performed at low voltage? Answer(s): No, the Flash is...