Freescale Semiconductor, Inc.
© Freescale Semiconductor, Inc., 2013. All rights reserved.
User’s Guide
Document Number: KT33972UG
Rev. 1.0, 7/2013
KIT33972AEWEVBE Evaluation Board
Featuring the MC33972A Multiple Switch Detection Interface IC
Figure 1. KIT33972AEWEVBE Evaluation Board
Contents
1 Kit Contents/Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Jump Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3 Important Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5 Evaluation Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6 MC33972A Device Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
7 Accessory Interface Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
8 Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
9 Evaluation Board Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
10 Installing SPIGen Freeware on your Computer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
11 Setup and Using the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
12 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
13 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
14 Bill of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
15 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
16 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Kit Contents/Packing List
Jump Start Your Design
1 Kit Contents/Packing List
• Assembled and tested evaluation board/module in anti-static bag.
• Warranty card
2Jump Start
•Go to www.freescale.com/analogtools
• Locate your kit
• Review your Tool Summary Page
• Look for
• Download documents, software and other information
KT33972UG User’s Guide Rev. 1.0 7/2013
2 Freescale Semiconductor
3 Important Notice
Freescale provides the enclosed product(s) under the following conditions:
This evaluation kit is intended for use of ENGINEERING DEVELOPMENT OR EVALUATION
PURPOSES ONLY. It is provided as a sample IC pre-soldered to a printed circuit board to make
it easier to access inputs, outputs, and supply terminals. This evaluation board may be used with
any development system or other source of I/O signals by simply connecting it to the host MCU
or computer board via off-the-shelf cables. This evaluation board is not a Reference Design and
is not intended to represent a final design recommendation for any particular application. Final
device in an application will be heavily dependent on proper printed circuit board layout and heat
sinking design as well as attention to supply filtering, transient suppression, and I/O signal quality.
The goods provided may not be complete in terms of required design, marketing, and or
manufacturing related protective considerations, including product safety measures typically
found in the end product incorporating the goods. Due to the open construction of the product, it
is the user's responsibility to take any and all appropriate precautions with regard to electrostatic
discharge. In order to minimize risks associated with the customers applications, adequate design
and operating safeguards must be provided by the customer to minimize inherent or procedural
hazards. For any safety concerns, contact Freescale sales and technical support services.
Should this evaluation kit not meet the specifications indicated in the kit, it may be returned within
30 days from the date of delivery and will be replaced by a new kit.
Freescale reserves the right to make changes without further notice to any products herein.
Freescale makes no warranty, representation or guarantee regarding the suitability of its products
for any particular purpose, nor does Freescale assume any liability arising out of the application
or use of any product or circuit, and specifically disclaims any and all liability, including without
limitation consequential or incidental damages. “Typical” parameters can and do vary in different
applications and actual performance may vary over time. All operating parameters, including
“Typical”, must be validated for each customer application by customer’s technical experts.
Freescale does not convey any license under its patent rights nor the rights of others. Freescale
products are not designed, intended, or authorized for use as components in systems intended
for surgical implant into the body, or other applications intended to support or sustain life, or for
any other application in which the failure of the Freescale product could create a situation where
personal injury or death may occur.
Should the Buyer purchase or use Freescale products for any such unintended or unauthorized
application, the Buyer shall indemnify and hold Freescale and its officers, employees,
subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal
injury or death associated with such unintended or unauthorized use, even if such claim alleges
that Freescale was negligent regarding the design or manufacture of the part.Freescale™ and the
Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service
names are the property of their respective owners.
© Freescale Semiconductor, Inc. 2013
Important Notice
KT33972UG User’s Guide Rev. 1.0 7/2013
Freescale Semiconductor, Inc. 3
Introduction
4 Introduction
This evaluation kit features the MC33972A Multiple Switch Detection Interface with suppressed wake-up.
The kit is 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).
The device also features a 22-to-1 analog multiplexer for reading inputs as analog. The analog input signal
is buffered and provided on the AMUX output pin for the MCU to read.The MC33972A device has two
modes of operation, Normal and Sleep. Normal Mode allows programming of the device and supplies switch
contacts with pull-up or pull-down current as it monitors switch change-of-state. The Sleep Mode provides
low quiescent current, which makes the MC33972A ideal for automotive and industrial products requiring
low sleep-state currents.
5 Evaluation Board Features
The board has the following capabilities:
• The MC33972A device can monitor as many as twenty-two switches and provide their states as
information to a PC for evaluation.
• An onboard 16-pin USB port connects to the PC through the Freescale SPI-to-USB Interface Dongle
(KITUSBSPIDGLEVME). See
Accessory Interface Board.
• The MC33972A device can be programmed using the SPIGen utility running on the PC. See
“
Installing SPIGen Freeware on your Computer”.
• LEDs report the status of the MC33972A Interrupt (INT) and Wake-Up lines.
6 MC33972A Device Features
The MC33972A device supports the following functions:
• Designed to operate 5.5 V ≤ V
• Switch input voltage range -14 V to VPWR, 40 V Max
• Interfaces directly to MPU using 3.3 V/5.0 V SPI protocol
• Selectable wake-up on change of state
• Selectable wetting current (16 or 2.0 mA)
• 8 programmable inputs (switches to battery or ground)
• 14 switch-to-ground inputs
• Typical standby current: V
• Active interrupt (INT) on change-of-switch state
Freescale analog ICs are manufactured using the SMARTMOS process, a combinational BiCMOS
manufacturing flow that integrates precision analog, power functions and dense CMOS logic together on a
single cost-effective die.
PWR
≤ 26V
PWR
= 100 µA and VDD = 20 µA
KT33972UG User’s Guide Rev. 1.0 7/2013
4 Freescale Semiconductor
7 Accessory Interface Board
The KIT33972AEWEVBE board may be used with the KITUSBSPIDGLEVME interface dongle (shown
below), which provides a USB-to-SPI interface. This small board makes use of the USB and SPI ports built
into Freescale’s MC68HC908JW32 microcontroller. The main function provided by this dongle is to allow
Freescale evaluation boards that have an SPI port to communicate with a PC through its USB port.
Figure 2. KITUSBSPIDGLEVME Interface Dongle
Accessory Interface Board
8 Required Equipment
Minimum equipment required:
• DC power supply
• USB-enabled PC with Windows XP or higher
• KITUSBSPIDGLEVME Interface Dongle
KT33972UG User’s Guide Rev. 1.0 7/2013
Freescale Semiconductor, Inc. 5
Loading...