Document Number: CD1020
Rev. 4, 7/2019
NXP Semiconductors
Technical Data
22 channel multiple switch detection
interface
CD1020
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.
MULTIPLE SWITCH DETECTION INTERFACE
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.
ES SUFFIX (PB-FREE)
98ASA00656D
32-PIN QFN (WF-TYPE)
Applications
• Automotive
The low cost MSDI is available in high power, space saving wettable flank
5x5 mm QFN package.
• Heating ventilation and air conditioning (HVAC)
• Lighting
• Central gateway/in-vehicle networking
• Gasoline engine management
Features
• Fully functional operation 6.0 V ≤ VBATP ≤ 36 V
• Full parametric operation 6.0 V ≤ VBATP ≤ 28 V
• Operating switch input voltage range from –1.0 V to 36 V
• Eight programmable inputs (switches to battery or ground)
• 14 switch-to-ground inputs
• Selectable wetting current (2, 8, 12, 16 mA)
• Interfaces directly to an MCU using 3.3 V / 5.0 V SPI protocol
• Selectable wake-up on change of state
• Typical standby current IBATP = 30 μA and IDDQ = 10 μA
• Active interrupt (INT_B) on change-of-switch state
VDDQ
Battery
Power
Supply
CD1020
SG1
Battery
VBATP
SP0
Power
Supply
WAKE_B
MCU
SP1
SP7
VDDQ
INT_B
CS_B
INTB
CSB
MISO
MISO
MOSI
SCLK
MOSI
SCLK
SG0
AN0
AMUX
SG12
SG13
EP
GND
Figure 1. CD1020 simplified application diagram
© NXP B.V. 2019.