CD1020 - NXP

CD1020 22-channel multiple switch detection interface

The CD1020 is a cost-optimized switch detection interface device (MSDI) 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 22-to-1 analog multiplexer for reading the i.

Features

Features and benefits
• Fully functional operation from 6.0 V to 36 V
• Full parametric operation from 6.0 V to 28 V
• Low-power mode current IBATP = 30 μA and IDDQ = 10 μA
• 22 Switch detection channels
  – 14 Switch-to-Ground (SG) inputs
  – Eight Programmable switch (SP) inputs
  – Switch-to-Ground (SG) or Switch-to-Battery (SB)
  – Operating switch input voltage range from
  –1.0 V to 36 V
  – Selectable wetting current (2, 8, 12, 16 mA)
  – Programmable wetting operation (pulse or continuous)
  – Selectable wake-up on change of state
• 22-to-1 Analog Multiplexer
  – Buffered AMUX output from SG/SP channels.