TPS3813-Q1 Series

Automotive voltage supervisor (reset IC) with programmable window watchdog

Catalog

Automotive voltage supervisor (reset IC) with programmable window watchdog

Part	Package / Case	Type	Output	Grade	Reset	Voltage - Threshold	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Reset Timeout	Mounting Type	Qualification	Number of Voltages Monitored
Texas Instruments TPS3813I50QDBVRQ1	SOT-23-6	Simple Reset/Power-On Reset	Open Drain or Open Collector	Automotive	Active Low	4.55 V	-40 °C	125 °C	SOT-23-6	20 ms	Surface Mount	AEC-Q100	1

Catalog

Automotive voltage supervisor (reset IC) with programmable window watchdog

Key Features

• Qualified for automotive applicationsAEC-Q100 qualified with the following results:Device temperature grade 1: –40°C to +125°C ambient operating temperature rangeDevice HBM classification level 2Device CDM classification level C4BWindow-watchdog with programmable delay and window ratio6-Pin SOT-23 packageSupply current of 9 µA (Typical)Power-on reset generator with a fixed delay time of 25 msPrecision supply-voltage monitor (VIT): 2.5 V, 3 V, 3.3 V, 5 VOpen-drain reset outputQualified for automotive applicationsAEC-Q100 qualified with the following results:Device temperature grade 1: –40°C to +125°C ambient operating temperature rangeDevice HBM classification level 2Device CDM classification level C4BWindow-watchdog with programmable delay and window ratio6-Pin SOT-23 packageSupply current of 9 µA (Typical)Power-on reset generator with a fixed delay time of 25 msPrecision supply-voltage monitor (VIT): 2.5 V, 3 V, 3.3 V, 5 VOpen-drain reset output

Description

The TPS3813-Q1 supervisory circuits provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems. During power on, theRESETpin is asserted when the supply voltage (VDD) becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDDand keeps theRESETpin active as long as VDDremains below the threshold voltage (VIT). An internal timer delays the return of the output to the inactive (high) state to ensure proper system reset. The delay time, td= 25 ms typical, begins after VDDhas risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider. For safety-critical applications, the TPS3813-Q1 family of device s incorporate a window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting the WDT pin to GND or VDD, or by using an external capacitor. The lower limit, and thus the window ratio, is set by connecting the WDR pin to GND or VDD. TheRESETpin will assert a reset to the microcontroller if the watchdog is incorrectly serviced. The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The device s are available in a 6-pin SOT-23 package. The device s are characterized for operation over a temperature range of –40°C to 125°C. The TPS3813-Q1 supervisory circuits provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems. During power on, theRESETpin is asserted when the supply voltage (VDD) becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDDand keeps theRESETpin active as long as VDDremains below the threshold voltage (VIT). An internal timer delays the return of the output to the inactive (high) state to ensure proper system reset. The delay time, td= 25 ms typical, begins after VDDhas risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider. For safety-critical applications, the TPS3813-Q1 family of device s incorporate a window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting the WDT pin to GND or VDD, or by using an external capacitor. The lower limit, and thus the window ratio, is set by connecting the WDR pin to GND or VDD. TheRESETpin will assert a reset to the microcontroller if the watchdog is incorrectly serviced. The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The device s are available in a 6-pin SOT-23 package. The device s are characterized for operation over a temperature range of –40°C to 125°C.