TPS3850H33DRCT

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	Adjustable/Selectable
Voltage - Threshold:	3.3V
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	10-VFDFN Exposed Pad
Supplier Device Package:	10-VSON (3x3)

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Introduction to TPS3850H33DRCT

The TPS3850H33DRCT is a precision microprocessor supervisory circuit designed for reset, power-on reset, power cycling, and power monitoring. It is designed to be an easy-to-use circuit for various applications within the electronics industry. Its key features include an adjustable reset threshold voltage and delay, an adjustable reset pulse width, an adjustable slew rate and a low input voltage supply current. This microprocessor supervisory circuit, commonly referred to as a supervisor, has a wide array of applications ranging from embedded devices and consumer to industrial and automotive.

Application Field

The TPS3850H33DRCT is designed for use in microprocessor-based systems where reset is required for proper system operation. It can be used in both consumer and industrial applications when power-on reset (POR) is needed. The device is capable of providing accurate, intolerant power-on reset signals (including open drain and open collector outputs) and power-cycles. For consumer applications, it can provide an alert reset mode to prevent false resets and an adjustable input voltage reset threshold for smart cards and portable electronics.

In industrial applications, the TPS3850H33DRCT provides advanced functions such as programmable reset threshold and delay, adjustable POR timeout, adjustable reset width, and adjustable slew rate. This makes it suitable for a variety of applications such as power monitoring, data acquisition and control systems. Additionally, the supervisor is suitable for use with Field Programmable Gate Arrays (FPGAs) to ensure reliable operation and prevent erroneous logic behavior due to on-chip device variations.

The TPS3850H33DRCT is well suited for use in automotive applications such as active diagnostics, system reset and power cycling. This includes automotive electronic systems, such as engine control units, ABS, power train control modules, and body control modules. Additionally, the supervisor can be used as a failsafe device for automatic power cycling to prevent system downtime.

Working Principle

The TPS3850H33DRCT is designed around a threshold detection principle. This means that when the input voltage falls below a predetermined threshold the supervisor will assert a reset signal. The reset threshold voltage (Vth) is set using an external voltage divider that is connected to the input voltage. When the reset signal is asserted, it causes the output to go low. The output can be set as either an open-drain or open-collector type.

The reset delay time is adjustable using an external capacitor (C1) and an external resistor (R1). The device also comes with an adjustable reset pulse width. This is accomplished by connecting an external capacitor (C2) to the RESETB pin. The instantaneous power-on reset (IPOR) function can be enabled by connecting an external capacitor (C3) to the PORB pin.

The device also features an adjustable output slew rate for improved system transient response. This is accomplished by connecting capacitors (C4) at the EN_SLEW pin. Additionally, the TPS3850H33DRCT can be used in open drain and open collector outputs for improved design flexibility. Finally, the device features an adjustable active low delay, which prevents false resets when the input voltage is momentarily below the reset threshold.

The TPS3850H33DRCT is designed to be easy to use and uncomplicated. It is ideal for various applications due to its adjustable reset threshold, delay, pulse width, and slew rate. Additionally, its open drain and open collector outputs provide improved design flexibility and its IPOR function ensures fast response times. All of these features make the TPS3850H33DRCT an ideal choice when reliability is required.

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