MC33972A FREESCALE [Freescale Semiconductor, Inc], MC33972A Datasheet

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MC33972A

Manufacturer Part Number
MC33972A
Description
Multiple Switch Detection Interface with Suppressed Wake-Up
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet

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Freescale Semiconductor
Advance Information
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007-2008. All rights reserved.
Multiple Switch Detection
Interface with Suppressed
Wake-Up
wake-Up 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.
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 33972 ideal for automotive and industrial products requiring low
sleep-state currents.
Features
• Designed to operate 5.5V ≤ V
• Switch input voltage range -14V to V
• Interfaces directly to MPU using 3.3V / 5.0V SPI protocol
• Selectable wake-up on change of state
• Selectable wetting current (16mA or 2.0mA)
• 8 programmable inputs (switches to battery or ground)
• 14 switch-to-ground inputs
• Typical standby current - V
• Active interrupt (
• Pb-free packaging designated by suffix code EW
• Exposed pad packaging designated by suffix code EK
The 33972 Multiple Switch Detection Interface with suppressed
The 33972 device has two modes of operation, Normal and Sleep.
V
INT
V
BAT
BAT
) on change-of-switch state
PWR =
PWR
SP0
SP1
SP7
SG0
SG1
SG12
SG13
100μA and V
≤ 26V
Figure 1. 33972 Simplified Application Diagram
PWR
33972
, 40V Max
VPWR
WAKE
AMUX
SCLK
GND
VDD
INT
SO
CS
DD
SI
= 20μA
V
VDD
BAT
MOSI
SCLK
CS
MISO
INT
AN0
MC33972DWB/R2
MC33972EW/R2
MCZ33972EW/R2
MCZ33972AEW/R2
MC33972TDWB/R2
MC33972TEW/R2
MCZ33972TEW/R2
MCZ33972AEK/R2
MCU
EW SUFFIX (Pb-FREE)
Device
98ARH99137A
32-PIN SOICW
DWB SUFFIX
WATCHDOG
RESET
POWER SUPPLY
ENABLE
ORDERING INFORMATION
DETECTION INTERFACE
MULTIPLE SWITCH
33972/A/T
LVI
Document Number: MC33972
-40°C to 125°C
Temperature
Range (T
VDD
EK SUFFIX (Pb-FREE)
A
32-PIN SOICW EP
)
98ASA10556D
Rev 15, 8/2008
32 SOICW EP
32 SOICW
Package

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MC33972A Summary of contents

Page 1

Freescale Semiconductor Advance Information Multiple Switch Detection Interface with Suppressed Wake-Up The 33972 Multiple Switch Detection Interface with suppressed wake-Up is designed to detect the closing and opening switch contacts. The switch status, either open or ...

Page 2

DEVICE VARIATIONS Table 1. Device Variations Device 33972 33972A 33972 2 DEVICE VARIATIONS Switch Input Voltage Range - - Reference Location Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 3

V V PWR PWR 16.0 2 SP0 SP1 4.0V 2.0 16.0 Ref mA mA SP2 SP3 SP4 V V PWR PWR SP5 16.0 2 SP6 SP7 4.0V 2.0 16.0 Ref PWR PWR ...

Page 4

PIN CONNECTIONS GND SCLK SP0 5 SP1 6 SP2 7 Exposed Pad SP3 8 EK Suffix SG0 9 Only SG1 10 SG2 11 SG3 12 SG4 13 SG5 14 SG6 15 VPWR 16 EK ...

Page 5

Table 3. Maximum Ratings All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent damage to the device. Ratings ELECTRICAL RATINGS VDD Supply Voltage (1) SI, SO, SCLK, , AMUX CS, ...

Page 6

ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 4. Static Electrical Characteristics Characteristics noted under conditions 3.1V ≤ V noted. Where applicable, typical values reflect the parameter’s approximate average value with V (7) Characteristic POWER INPUT Supply Voltage Supply ...

Page 7

Table 4. Static Electrical Characteristics (continued) Characteristics noted under conditions 3.1V ≤ V noted. Where applicable, typical values reflect the parameter’s approximate average value with V (7) Characteristic DIGITAL INTERFACE (11) Input Logic Voltage Thresholds SCLK, SI, Tri-state SO Input ...

Page 8

ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS Table 5. Dynamic Electrical Characteristics Characteristics noted under conditions 3.1V ≤ V Where applicable, typical values reflect the parameter’s approximate average value with V Characteristic SWITCH INPUT Pulse Wetting Current Time Interrupt ...

Page 9

CS 0 LEAD 0.7 V SCLK DD 0 SI(SU SO(EN VPWR VDD WAKE INT CS SGn Tri-State Sleep Power-Up ...

Page 10

FUNCTIONAL DESCRIPTION INTRODUCTION The 33972 device is an integrated circuit designed to provide systems with ultra-low quiescent sleep / wake-up modes, and a robust interface between switch contacts and a microprocessor. The 33972 replaces many of the discrete components required ...

Page 11

WAKE-UP (WAKE) The WAKE pin is an open-drain output and a wake-up input. The pin is designed to control a power supply Enable pin. In the Normal Mode, the pin is LOW. In the Sleep WAKE Mode, the pin is ...

Page 12

FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION MC33972 - Functional Block Diagram Control & Protection Interface & Control Control & Protection Figure 7. Functional Internal Block Description CONTROL AND PROTECTION CIRCUITRY: The 33972 is designed to operate ...

Page 13

FUNCTIONAL DEVICE OPERATION MCU INTERFACE DESCRIPTION The 33972 device directly interfaces to a 3.3V or 5.0V microcontroller unit (MCU). SPI serial clock frequencies up to 6.0MHz may be used for programming and reading switch input status (production tested at 4.16MHz). ...

Page 14

FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES POWER SUPPLY The 33972 is designed to operate from 5.5V to 40V on the VPWR pin. Characteristics are provided from 8.0V to 16V for the device. Switch contact currents and the internal logic supply are ...

Page 15

Table 7. Wake-up / Interrupt Command Wake-up /Interrupt Command WETTING CURRENT REGISTER The 33972 has two ...

Page 16

FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES TRI-STATE REGISTER The tri-state command is use to set the SPn or SGn input node as high-impedance (Table 10). By setting the tri-state register bit to logic [1], the input will be high-impedance regardless of ...

Page 17

CALIBRATION OF TIMERS In cases where an accurate time base is required, the user may calibrate the internal timers using the calibration command (Table 13). After the 33972 device receives the calibration command, the device expects 512μs logic [0] calibration ...

Page 18

FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES RESET The reset command resets all registers to Power-ON Reset (POR) state. Refer to Table 15, page 18, for POR Table 14. Reset Command Reset Command ...

Page 19

Table 16. Serial Output (SO) Bit Data Type of Input SP SG Table 17. Serial Output (SO) Response Register them int SO Response Will SP7 SP6 SP5 SP4 Always Send flg flg EXAMPLE OF NORMAL MODE OPERATION The operation of ...

Page 20

FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES Table 19. Interrupt Timer Bits 543 Interrupt Period 000 32ms 001 64ms 010 128ms 011 256ms 100 512ms 101 1.024s 110 2.048s 111 No interrupt wake-up The scan timer sets the polling period between input ...

Page 21

The 33972’s primary function is the detection of open or closed switch contacts. However, there are many features that allow the device to be used in a variety of applications. The following is a list of applications to consider for ...

Page 22

TYPICAL APPLICATIONS INTRODUCTION 33972 V BAT SP0 VPWR SP1 V VDD V BAT SP7 WAKE SI SG0 SCLK V V SG1 PWR PWR 2 INT 1 2.0mA SG12 AMUX PWR PWR ...

Page 23

VBAT V V PWR PWR 16 mA 1.5kΩ SG0 100kΩ 4.0V Ref V V PWR PWR 16 mA SP0 PWR PWR 16 mA SG13 4.0V Ref Figure 15. MOSFET or LED Driver Output The sequence of ...

Page 24

TYPICAL APPLICATIONS INTRODUCTION from first device is connected second device). With two devices, 48 clock pulses are required to shift data in. When the WAKE feature is used to enable the power supply, both WAKE pins should ...

Page 25

V BAT V 33972 BAT V SP0 SP1 V VDD BAT SP7 WAKE SG0 SG1 SCLK AMUX SG12 SG13 Figure 16. Power Supply Active in Sleep Mode V BAT V 33972 BAT V SP0 SP1 V WAKE BAT SP7 SG0 ...

Page 26

PACKAGING PACKAGE DIMENSIONS For the most current package revision, visit www.freescale.com and perform a keyword search using the 98A listed below. 33972 26 PACKAGING PACKAGE DIMENSIONS DWB SUFFIX EW SUFFIX (Pb-FREE) 32-LEAD SOIC WIDE BODY 98ARH99137A ISSUE B Analog Integrated ...

Page 27

Analog Integrated Circuit Device Data Freescale Semiconductor PACKAGE DIMENSIONS (CONTINUED) DWB SUFFIX EW SUFFIX (Pb-FREE) 32-LEAD SOIC WIDE BODY 98ARH99137A ISSUE B PACKAGING PACKAGE DIMENSIONS (CONTINUED) 33972 27 ...

Page 28

PACKAGING PACKAGE DIMENSIONS (CONTINUED) 33972 28 EK SUFFIX (Pb-FREE) 32-LEAD SOIC WIDE BODY EXPOSED PAD 98ASA10556D ISSUE D Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 29

Analog Integrated Circuit Device Data Freescale Semiconductor EK SUFFIX (Pb-FREE) 32-LEAD SOIC WIDE BODY EXPOSED PAD 98ASA10556D ISSUE D PACKAGING PACKAGE DIMENSIONS (CONTINUED) 33972 29 ...

Page 30

PACKAGING PACKAGE DIMENSIONS (CONTINUED) 33972 30 EK SUFFIX (Pb-FREE) 32-LEAD SOIC WIDE BODY EXPOSED PAD 98ASA10556D ISSUE D Analog Integrated Circuit Device Data Freescale Semiconductor ...

Page 31

... R2 to the ordering information. • Updated to the current Freescale form and style 11/2007 11.0 • Added MC33972AEK/R2 to the ordering information. • Included device specific information relevant to the EK suffix on pages 27, and 28. • Added sentence to • Made calculation corrections to • Corrected Device Variation Table on page 2. ...

Page 32

How to Reach Us: Home Page: www.freescale.com Web Support: http://www.freescale.com/support USA/Europe or Locations Not Listed: Freescale Semiconductor, Inc. Technical Information Center, EL516 2100 East Elliot Road Tempe, Arizona 85284 +1-800-521-6274 or +1-480-768-2130 www.freescale.com/support Europe, Middle East, and Africa: Freescale Halbleiter ...

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