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2022-09-24 21:48:02
TPS3823-50DBVR Supply Voltage Monitoring with Watchdog Input and Manual Reset
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The TPS382x series of supervisors mainly provide functions such as circuit initialization and timing monitoring for DSP and processor-based systems. During power-up, RESET is asserted when the supply voltage VDD exceeds 1.1V. Therefore, the supply voltage monitor monitors VDD and keeps RESET active low as long as the following conditions are met: VDD remains below the threshold voltage VIT?. An internal timer will delay the time the output returns to its inactive state (high) to ensure a normal system reset. The delay time td begins when VDD rises above the threshold voltage (VIT? + VHYS). When the supply voltage falls below the threshold voltage VIT?, the output becomes active again (low). No external components are required. All devices in this family have a fixed detection threshold voltage VIT– set by an internal voltage divider. The TPS382x family also offers watchdog timeout options of 200ms (TPS3820) and 1.6s (TPS3823/4/8).
characteristic
Power-on reset generator with fixed delay time of 200ms (TPS3823/4/5/8) or 25ms (TPS3820)
Manual reset input (TPS3820/3/5/8)
Reset output provides active low (TPS3820/3/4/5), active high (TPS3824/5) and open drain (TPS3828)
Supply voltage monitoring range:
2.5V, 3V, 3.3V, 5V
Watchdog Timer (TPS3820/3/4/8)
Supply current 15μA (typ.)
5-Pin SOT-23 Package
Temperature Range: ~40°C to 85°C