CD1020: Low-Cost 22-CH Multiple Switch Detect Interface

Overview

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 two modes of operation, Normal and Low-power mode (LPM). Normal mode allows programming of the device and supplies switch contacts with pull-up or pull-down 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.

The low-cost MSDI is available in high power, space-saving wettable flank 5x5mm QFN package.

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Features

Designed to operate 6 V ≤ VBATP ≤ 36 V
Switch input voltage range -14 V to VPWR, 36 V Max.
Interfaces directly to an MCU using 3.3 V / 5.0 V SPI protocol
- Selectable wake-up on change of state
- Selectable wetting current (2, 8, 12, or 16mA)
8 programmable inputs (switches to battery or ground) and 14 switch-to-ground inputs
Typical standby current - VBATP = 30 uA and VDD = 10 uA
Integrated battery and temperature sensing

MoreLess

Features

Designed to operate 6 V ≤ VBATP ≤ 36 V
Switch input voltage range -14 V to VPWR, 36 V Max.
Interfaces directly to an MCU using 3.3 V / 5.0 V SPI protocol
- Selectable wake-up on change of state
- Selectable wetting current (2, 8, 12, or 16mA)
8 programmable inputs (switches to battery or ground) and 14 switch-to-ground inputs
Typical standby current - VBATP = 30 uA and VDD = 10 uA
Integrated battery and temperature sensing