Overview
The NXP MC33972TEWR2 is a multiple switch detection interface with suppressed wake-up, designed to detect the closing and opening of up to 22 switch contacts. This integrated circuit is part of NXP's portfolio and is particularly suited for automotive applications. It offers ultra-low quiescent sleep and wake-up modes, making it efficient for systems that require robust switch contact detection and minimal power consumption.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage (VPWR) | 5.5 | - | 26 | V |
| Switch Input Voltage Range | -14 | - | 40 | V |
| VDD Supply Voltage | 3.1 | - | 5.25 | V |
| Temperature Range (TA) | -40 | - | 125 | °C |
| Standby Current (VPWR = 100 μA, VDD = 20 μA) | - | 100 μA, 20 μA | - | μA |
| Package Type | - | - | 32-Pin SOICW | - |
Key Features
- Interfaces directly to a microprocessor using 3.3 V / 5.0 V SPI protocol
- Selectable wake-up on change of state
- Selectable wetting current (16 or 2.0 mA)
- 8 programmable inputs (switches to battery or ground) and 14 switch-to-ground inputs
- Programmable wake-up timer and interrupt timer
- Programmable wake-up/interrupt bits
- Analog multiplex output for reading switch inputs as analog inputs
- Active interrupt (INT) on change-of-switch state
- Ultra-low quiescent sleep and wake-up modes
Applications
The MC33972TEWR2 is primarily designed for automotive applications, where it can be used to detect and manage multiple switch contacts efficiently. It is suitable for systems that require robust switch contact detection, low power consumption, and reliable wake-up mechanisms.
Q & A
- What is the primary function of the MC33972TEWR2?
The MC33972TEWR2 is designed to detect the closing and opening of up to 22 switch contacts and interface directly with a microprocessor.
- What is the operating voltage range for the MC33972TEWR2?
The operating voltage range for VPWR is 5.5 V to 26 V.
- What types of inputs does the MC33972TEWR2 support?
The device supports 8 programmable inputs (switches to battery or ground) and 14 switch-to-ground inputs.
- How does the MC33972TEWR2 manage wake-up and interrupt?
The device features selectable wake-up on change of state, programmable wake-up timer, and programmable interrupt timer.
- What is the typical standby current for the MC33972TEWR2?
The typical standby current is 100 μA for VPWR and 20 μA for VDD.
- What communication protocol does the MC33972TEWR2 use to interface with a microprocessor?
The device uses 3.3 V / 5.0 V SPI protocol to interface with a microprocessor.
- What is the temperature range for the MC33972TEWR2?
The temperature range is -40 °C to 125 °C.
- What package type is the MC33972TEWR2 available in?
The device is available in a 32-Pin SOICW package.
- Can the switch inputs be read as analog inputs?
Yes, all switch inputs can be read as analog inputs through the analog multiplexer (AMUX).
- What are the typical applications for the MC33972TEWR2?
The device is primarily used in automotive applications.
