1 Features
• Qualified for automotive applications
• AEC-Q100 qualified with the following results:
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature range
– Device HBM classification level 2
– Device CDM classification level C4B
• Window-watchdog with programmable delay and
window ratio
• 6-Pin SOT-23 package
• Supply current of 9 μA (Typical)
• Power-on reset generator with a fixed delay time of
25 ms
• Precision supply-voltage monitor (VIT):
2.5 V, 3 V, 3.3 V, 5 V
• Open-drain reset output

2 Applications
• On-board (OBC) and wireless charger
• Driver monitoring
• Digital cockpit processing unit
• ADAS domain controller
• Automotive telematics control unit

3 Description
The TPS3813-Q1 supervisory circuits provide circuit
initialization and timing supervision, primarily for DSPs
and processor-based systems.
During power on, the RESET pin is asserted when
the supply voltage (VDD) becomes higher than 1.1 V.
Thereafter, the supervisory circuit monitors VDD and
keeps the RESET pin active as long as VDD remains
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 VDD
has 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 devices 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. The RESET pin 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 devices are
available in a 6-pin SOT-23 package. The devices are
characterized for operation over a temperature range
of –40°C to 125°C.