22 I/O MSDI Programmable Current Analog Mux
Design Files
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Low-Cost 22-CH Multiple Switch Detect 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 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.
CD1020 Package Image
Product Details
Block Diagram
Features
Key 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
- Active switch monitoring, switch detection interface device function
- Package termination count: 32
- Package type: HVQFN32
- Ambient operating temperature -40 to 125 °C
Product Longevity Program
- This product is included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The CD1020 is included in the 15-year program
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Documentation
Quick reference to our documentation types.
Design Resources
Hardware
Quick reference to our
board types.
2 hardware offerings
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Embedded Board SolutionsEmbedded SW: Multiple Switch Detection Interface Software Driver
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Evaluation and Development BoardsEvaluation Board for CD1020 - 22-Channel Switch Detection Interface
Engineering Services
To get further assistance directly from NXP, please see our Engineering Services.
2 engineering services
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Independent Design House (IDH)
Hardware Design Services
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Independent Design House (IDH)
Embedded Software Design
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