| Number of supplies monitored | 1, 2 |
| Threshold voltage 1 (Typ) (V) | 0.8 |
| Features | Detection time delay, Manual reset capable, Reset time delay, Separate VDD & sense, Undervoltage monitor only, Wide input voltage |
| Reset threshold accuracy (%) | 1.5 |
| Output driver type/reset output | Active-high, Active-low, Open-drain, Push-pull |
| Time delay (ms) | Programmable |
| Rating | Catalog |
| Operating temperature range (C) | -40 to 125 |
- Functional Safety-Capable
- Documentation available to aid functional safety system design
- Wide supply voltage range: 2.7 V to 65 V
- SENSE and RESET pins are 65 V graded
- Low quiescent current: 1 μA (typical)
- Flexible and wide voltage threshold options Table 12-1
- 2.7 V to 36 V (1.5% maximum accuracy)
- 800 mV option (1% maximum accuracy)
- Built-in hysteresis (VHYS)
- Percentage options: 2% to 13% (1% steps)
- Fixed options: VTH < 8 V = 0.5 V, 1 V, 1.5 V, 2 V, 2.5 V
- Programmable reset time delay
- 10 nF = 12.8 ms, 10 μF = 12.8 s
- Programmable sense time delay
- 10 nF = 1.28 ms, 10 μF = 1.28 s
- Manual Reset (MR) feature
- Output reset latching feature
- Output topology:
- Channel 1: Open-Drain or Push-Pull
- Channel 2: Open-Drain
The TPS38 is a 65 V input voltage detector with 1 μA IDD, 1% accuracy, and with a fast 10 μs detection time. This device can be connected directly to 12 V / 24 V automotive battery system for continuous monitoring of over (OV) or under (UV) voltage conditions; with its internal resistor divider, it offers the smallest total solution size. Wide hysteresis voltage options are available to ignore cold crank, start-stop and various car battery voltage transients. Built-in hysteresis on the SENSE pins prevents false reset signals when monitoring a supply voltage rail.
The separate VDD and SENSE pins allow for the redundancy sought by high-reliability automotive systems and SENSE can monitor higher and lower voltages than VDD. Optional use of external resistors are supported by the high impedance input of the SENSE pins. CTSx and CTRx pins allow delay adjustability on the rising and falling edges of the RESET signals. Also, CTSx functions as a debouncer by ignoring voltage glitches on the monitored voltage rails; CTRx operates as a manual reset (MR) that can be used to force a system reset.
The TPS38 is available in a WSON or SOT-23 package. The central pad is non-conductive to increase the creepage between VDD and GND per guidelines in IEC60664. TPS38 operates over –40°C to +125°C TA.
