Keywords: Initialization, Start Up, power-on reset (POR), Fault
The MAX3955 and MAX3956 devices (MAX395X) must be initialized properly to guarantee correct operation. The following is a flow chart and description detailing the recommended initialization sequence for a MAX395X device. This sequence should be performed following a power-on reset (POR) and also to detect and recover from brownout conditions. Following these recommended steps will ensure that the MAX395X operates as expected following a POR or brownout.
Note 1: The MAX395X Status Register (including TOPSTAT and TXSTAT1) contain sticky bits, meaning the bits will remain set until they are read. Once read, the bits are reset to zero if the source of the flag has been removed. Because the status bits are sticky bits, multiple register reads may be required before the status bits read back clear.
Note 2: The flow shown is for a routine that will be called once every time the microcontroller’s main processing loop is executed. This allows checking for completion of POR and also for any subsequent brownout condition with the same routine. This flow is designed to not hold the microprocessor while waiting for the flags to clear; instead the microprocessor will check again the next time through the main loop. Similar flows can be developed that will poll the MAX395X flags continuously until they are clear.
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