CD1020 Datasheet | NXP Semiconductors

22-channel multiple switch detection interface Rev. 5 - 20 August 2024 Product data sheet 1 General description 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 input channels as analog inputs. The analog selected input signal is buffered and provided on the AMUX output pin for the MCU to read. The CD1020 device has three modes of operation, normal mode, low-power mode (LPM), and polling mode. Normal mode allows programming of the device and supplies switch contacts with pullup or pulldown current as it monitors the change of state on the switches. The LPM provides low quiescent current, which makes the CD1020 ideal for automotive and industrial products requiring low sleep-state currents. Polling mode periodically interrogates the input pins to determine the state the pins are in, and to decide whether there was a change of state from normal mode. The low-cost MSDI is available in a high-power, space-saving wettable flank 5x5 mm QFN package. NXP Semiconductors 22-channel multiple switch detection interface 2 Features and benefits 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 m A) - 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 - Active interrupt...