CD1020|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.

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

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

Key Parametrics

Device Function

switch detection interface, active switch monitoring
Package Termination Count

32
Package Type

HVQFN32
Load Supply Voltage (Min) (V)

6
Load Supply Voltage (Max) (V)

36
Interface and Input Control

SPI / SPI
Ambient Operating Temperature (Min to Max) (℃)

-40 to 125

FRDMCD1020EVM:Evaluation Board for CD1020 - 22-Channel Switch Detection Interface

Evaluation and Development Boards

Target Applications

Automotive

Diesel Engine Management
Electric Power Steering (EPS)
Gateway
Heating ventilation and air conditioning (HVAC)
Hybrid Electric Vehicle (HEV) Applications
Instrument Cluster
Lighting
Transmission and Gearbox

Industrial

Ethernet switch
Input-output control (I/O Control)
Process control, temperature control
Programmable logic control (PLC)
Single board computer

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

Overview

Features

CD1020 Low-Cost 22-CH Multiple Switch Detect Interface Block Diagram

CD1020 Package Image

CD1020 Low-Cost 22-CH Multiple Switch Detect Interface Block Diagram

CD1020 Package Image

Key Parametrics

Development Boards and Designs

Development Boards and Designs

Target Applications

Automotive

Industrial

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