NXP Semiconductors 33978
The 33978 is designed to detect the closing and opening of up to 22 switch contacts. The switch status, either open or closed, is transferred to the microprocessor unit (MCU) through a serial peripheral interface (SPI). This SMARTMOS device also features a 24-to-1 analog multiplexer for reading the input channels as analog inputs.| Part No. | 33978 |
|---|---|
| Datasheet | 33978 Download |
| Manufacturer |  NXP Semiconductors |
| Description | 22-channel multiple switch detection interface |
| Buy | Stock & Price |
FEATURES
● Fully functional operation 4.5 V ≤ VBATP ≤ 36 V● Full parametric operation 6.0 V ≤ VBATP ≤ 28 V
● Operating switch input voltage range from -1.0 V to 36 V
● Eight programmable inputs (switches to battery or ground)
● 14 switch-to-ground inputs
● Selectable wetting current (2, 6, 8, 10, 12, 14, 16, or 20 mA)
● Interfaces directly to an MCU using 3.3 V / 5.0 V SPI protocol
● Selectable wake-up on change of state
● Typical standby current IBATP = 30 μA and IDDQ = 10 μA
● Active interrupt (INT_B) on change-of-switch state
● Integrated battery and temperature sensing MULTIPLE SWITCH DETECTION INTERFACE EK SUFFIX (PB-FREE) 98ASA10556D 32-PIN SOICW-EP ES SUFFIX (PB-FREE) 98ASA00656D 32-PIN QFN (WF-TYPE)
APPLICATIONS
● Automotive● Heating ventilation and air conditioning (HVAC)
● Lighting
● Central gateway/in-vehicle networking
● Gasoline engine management
● Industrial
● Programmable logic control (PLC)
● Process control, temperature control
● Input-output control (I/O Control)
● Single board computer
● Ethernet switch Notes 1.
