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TMDXRM46HDK: Internal voltage monitor

Part Number: TMDXRM46HDK

What does the "Internal Voltage Monitor (VMON) report?  Is voltage available from it?

  • Hello,

    The purpose of this voltage monitor is to eliminate the requirement for a specific sequence when powering up the core and I/O voltage supplies.

    The voltage monitor only monitors the core supply (VCC) and the I/O supply (VCCIO). The other supplies are not monitored by the VMON. For example, if the VCCAD or VCCP are supplied from a source different from that for VCCIO, then there is no internal voltage monitor for the VCCAD and VCCP supplies.

    The voltage monitor generates the Power Good MCU signal (PGMCU) as well as the I/Os Power Good IO signal (PGIO) on the device. During power-up or power-down, the PGMCU and PGIO are driven low when the core or I/O supplies are lower than the specified minimum monitoring thresholds. The PGIO and PGMCU being low isolates the core logic as well as the I/O controls during the power-up or power-down

    of the supplies. This allows the core and I/O supplies to be powered up or down in any order. When the voltage monitor detects a low voltage on the I/O supply, it will assert a power-on reset. When the voltage monitor detects an out-of-range voltage on the core supply, it asynchronously makes all output pins high impedance, and asserts a power-on reset. The voltage monitor is disabled when the device enters a low power mode.

    The VMON also incorporates a glitch filter for the nPORRST input.

    Here are VMON Specs:

    7462.VMON Specs.tif

    There is no way to read/control  VMON.

    Best regards,

    Miro