The voltage detectors (VDT) are designed to detect the precise high/low levels of a supply voltage. The voltage detector circuits are only used to monitor the general power supply. When a circuit detects that the voltage Vxx is greater than (VDETn +VHYSn), its output VOUT will be generated as logic high. When a voltage detector circuit detects a voltage that is less than VDETn, its output VOUT will be generated as logic low and will be used as the low-power signal. VOUT provides a short duration of the power output at the power-up phase to reset the logical elements to the initial states. An additional input signal, PD, can be used to power-down the core and return the output VOUT to logic low. The voltage detectors provide immunity of the mid-range power noise.
USB OTG VDT
These voltage detector circuits are used in the USB OTG applications to monitor a specific voltage input (VBUS) at four different levels. These voltage detectors support the hysteresis function, power-down mechanism, and mid-range noise immunity. When one of these circuits detects the VBUS voltage to be more than (VDET + VHYS), its outputs, AVALID, BVALID, and VBUSVALID, will be generated as logic high (SESSEND goes low). When one of these circuits detects a voltage to be less than VDET, its outputs, AVALID, BVALID, and VBUSVALID, are generated as logic low (SESSEND goes high) and are used as the low-power detector. AVALID, BVALID, and VBUSVALID provide a power output short duration at the power-up phase (Used to reset the logical elements to the initial states). An additional input signal, PD, can be used to power down the core, and return the AVALID, BVALID, and VBUSVALID outputs to logic low (SESSEND goes high).
- Low power consumption
- Excellent temperature coefficient
- Built-in high-stability reference source
- Built-in hysteresis characteristic
- Supply glitch immunity