Freescale Semiconductor, Inc.
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Document order number: MC33972
Rev 3.0, 12/2004
Advance Information
33972
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 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 terminal for the MCU to
read.
MULTIPLE SWITCH
DETECTION INTERFACE WITH
SUPPRESSED WAKE-UP
Freescale Semiconductor, Inc...
The 33972 device has two modes of operation, Normal and Sleep. Normal
mode allows programming of the device and supplies switch contacts with
pullup or pulldown 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 5.5 V
≤
V
PWR
≤
26 V
Switch Input Voltage Range -14 V to V
PWR
, 40 V Max
Interfaces Directly to Microprocessor Using 3.3 V/5.0 V SPI Protocol
Selectable Wake-Up on Change of State
Selectable Wetting Current (16 mA or 2.0 mA)
8 Programmable Inputs (Switches to Battery or Ground)
14 Switch-to-Ground Inputs
V
PWR
Standby Current 100
µA
Typical, V
DD
Standby Current 20
µA
Typical
• Active Interrupt (
INT
) on Change-of-Switch State
• Pb-Free Packaging Designated by Suffix Code EW
•
•
•
•
•
•
•
•
DWB SUFFIX
EW (Pb-FREE) SUFFIX
CASE 1324-02
32-TERMINAL SOICW
ORDERING INFORMATION
Device
MC33972DWB/R2
MC33972EW/R2
Temperature
Range (T
A
)
-40
°
C to 125
°
C
Package
32 SOICW
Simplified Application Diagram
33972 Simplified Application Diagram
VDD
VBAT
VBAT
SP0
SP1
VBAT
SP7
Power Supply
LVI
Enable
Watchdog
Reset
33972
VPWR
VDD
WAKE
SI
SCLK
CS
SO
INT
AMUX
MCU
SG0
SG1
SG12
MOSI
SCLK
CS
MISO
INT
AN0
SG13
GND
This document contains information on a new product.
Specifications and information herein are subject to change without notice.
© Motorola, Inc. 2004
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5.0 V
V
PWR
V
PWR
16.0
mA
SP0
SP1
SP2
SP3
SP4
16.0
mA
To
+
2.0 4.0 V
–
SPI
mA Ref
Comparator
2.0
mA
SP0
V
PWR
V
PWR
, V
DD
, 5.0 V
POR
Bandgap
Sleep PWR
V
PWR
V
DD
GND
Freescale Semiconductor, Inc...
SP5
SP6
SP7
V
PWR
V
PWR
16.0
mA
2.0
mA
SP7
5.0 V
Oscillator
and
Clock Control
V
PWR
16.0
mA
To
+
2.0 4.0 V
–
SPI
mA Ref
Comparator
5.0 V
5.0 V
V
PWR
5.0 V
WAKE
Temperature
Monitor and
Control
5.0 V
125 kΩ
V
PWR
V
PWR
16.0
mA
SG0
SG1
SG2
SG3
SG4
SG5
SG6
SG7
SG8
SG9
2.0
mA
SG0
To
+
4.0 V
–
SPI
Ref
Comparator
WAKE
Control
V
DD
SPI Interface
and Control
125 kΩ
INT
INT
Control
V
DD
MUX Interface
40
µA
CS
V
DD
SCLK
SI
SO
SG10
SG11
SG12
SG13
To
+
4.0 V
–
SPI
Ref
Comparator
V
PWR
V
PWR
16.0
mA
2.0
mA
V
DD
SG13
+
Analog Mux
Output
–
AMUX
Figure 1. 33972 Simplified Internal Block Diagram
33972
2
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc...
GND
SI
SCLK
CS
SP0
SP1
SP2
SP3
SG0
SG1
SG2
SG3
SG4
SG5
SG6
V
PWR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
SO
V
DD
AMUX
INT
SP7
SP6
SP5
SP4
SG7
SG8
SG9
SG10
SG11
SG12
SG13
WAKE
TERMINAL DEFINITIONS
A functional description of each terminal can be found in the System/Application Information section beginning on
page 9.
Terminal
1
2
3
4
5–8
25–28
9–15,
18–24
16
17
29
30
31
32
Terminal
Name
GND
SI
SCLK
CS
SP0–3
SP4–7
SG0–6,
SG13–7
V
PWR
WAKE
INT
AMUX
V
DD
SO
Formal Name
Ground
SPI Slave In
Serial Clock
Chip Select
Programmable Switches 0–7
Switch-to-Ground Inputs 0–13
Battery Input
Wake-Up
Interrupt
Analog Multiplex Output
Voltage Drain Supply
SPI Slave Out
Definition
Ground for logic, analog, and switch to battery inputs.
SPI control data input terminal from MCU to 33972.
SPI control clock input terminal.
SPI control chip select input terminal from MCU to 33972. Logic [0} allows data to be
transferred in.
Programmable switch-to-battery or switch-to-ground input terminals.
Switch-to-ground input terminals.
Battery supply input terminal. Terminal requires external reverse battery protection.
Open drain wake-up output. Designed to control a power supply enable terminal.
Open-drain output to MCU. Used to indicate input switch change of state.
Analog multiplex output.
3.3/5.0 V supply. Sets SPI communication level for SO driver.
Provides digital data from 33972 to MCU.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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3
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MAXIMUM RATINGS
All voltages are with respect to ground unless otherwise noted.
Rating
Symbol
Value
Unit
ELECTRICAL RATINGS
V
DD
Supply Voltage
CS,
SI, SO, SCLK,
INT
, AMUX
(Note 1)
WAKE
(Note 1)
–
–
–
–
–
–
-0.3 to 7.0
-0.3 to 7.0
-0.3 to 40
-0.3 to 50
-14 to 40
6.0
V
DC
V
DC
V
DC
V
DC
V
DC
MHz
V
V
PWR
Supply Voltage
(Note 1)
Switch Input Voltage Range
Frequency of SPI Operation (V
DD
= 5.0 V)
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ESD Voltage
(Note 2)
Human Body Model
(Note 3), (Note 4)
Machine Model
(Note 5)
V
ESD1
V
ESD2
±4000
±200
THERMAL RATINGS
Operating Temperature
Ambient
Junction
Case
Storage Temperature
Power Dissipation (T
A
= 25
°
C)
(Note 6)
Thermal Resistance
Junction to Ambient
Junction to Lead
Peak Package Reflow Temperature During Solder Mounting
(Note 7)
DWB Suffix
EW Suffix
Notes
1. Exceeding these limits may cause malfunction or permanent damage to the device.
2. ESD data available upon request.
3. ESD1 testing is performed in accordance with the Human Body Model (C
ZAP
= 100 pF, R
ZAP
= 1500
Ω).
4.
5.
6.
7.
All terminals when tested individually.
ESD2 testing is performed in accordance with the Machine Model (C
ZAP
= 200 pF, R
ZAP
= 0
Ω).
Maximum power dissipation at T
J
= 150
°
C junction temperature with no heat sink used.
Terminal soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
R
θ
JA
R
θ
JL
T
SOLDER
240
245
74
25
T
A
T
J
T
C
T
STG
P
D
-40 to 125
-40 to 150
-40 to 125
-55 to 150
1.7
°
C
°
C
W
°
C/W
°
C
33972
4
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Freescale Semiconductor, Inc.
STATIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions of 3.1 V
≤
V
DD
≤
5.25 V, 8.0 V
≤
V
PWR
≤
16 V, -40°C
≤
T
C
≤
125°C, unless otherwise noted.
Where applicable, typical values reflect the parameter’s approximate average value with V
PWR
= 13 V, T
A
= 25°C.
Characteristic
Symbol
Min
Typ
Max
Unit
POWER INPUT
Supply Voltage
Supply Voltage Range Quasi-Functional
(Note 8)
Fully Operational
Supply Voltage Range Quasi-Functional
(Note 8)
Supply Current
All Switches Open, Normal Mode, Tri-State Disabled
V
PWR
(
QF
)
V
PWR
(
FO
)
V
PWR
(
QF
)
I
PWR
(
ON
)
–
I
PWR
(
SS
)
40
V
DD
I
DD
–
I
DD
(
SS
)
–
10
20
0.25
0.5
µA
3.1
70
–
100
5.25
V
mA
2.0
4.0
µA
5.5
8.0
26
–
–
–
8.0
26
40
mA
V
Freescale Semiconductor, Inc...
Sleep State Supply Current
Scan Timer = 64 ms, Switches Open
Logic Supply Voltage
Logic Supply Current
All Switches Open, Normal Mode
Sleep State Logic Supply Current
Scan Timer = 64 ms, Switches Open
SWITCH INPUT
Pulse Wetting Current Switch-to-Battery (Current Sink)
Pulse Wetting Current Switch-to-Ground (Current Source)
Sustain Current Switch-to-Battery Input (Current Sink)
Sustain Current Switch-to-Ground Input (Current Source)
Sustain Current Matching Between Channels on Switch-to-Ground Inputs
I
SUS(MAX)
- I
SUS(MIN)
I
SUS(MIN)
X 100
I
OFFSET
V
OFFSET
-10
V
OL
–
V
OH
V
DD
- 0.1
V
TH
V
IN
T
LIM
T
LIM(HYS)
3.70
-14
155
5.0
–
4.0
–
–
10
–
4.3
40
185
15
V
V
10
30
V
2.5
10
mV
I
PULSE
I
PULSE
I
SUSTAIN
I
SUSTAIN
I
MATCH
–
2.0
4.0
µA
mV
12
12
1.8
1.8
15
16
2.0
2.0
18
18
2.2
2.2
mA
mA
mA
mA
%
Input Offset Current When Selected as Analog
Input Offset Voltage When Selected as Analog
V
(SP&SGinputs)
to AMUX Output
Analog Operational Amplifier Output Voltage
Sink 250
µA
Analog Operational Amplifier Output Voltage
Source 250
µA
Switch Detection Threshold
Switch Input Voltage Range
Temperature Monitor
(Note 9), (Note 10)
Temperature Monitor Hysteresis
(Note 10)
-2.0
1.4
2.0
°
C
°
C
Notes
8. Device operational. Table parameters may be out of specification.
9. Thermal shutdown of 16 mA pullup and pulldown current sources only. 2.0 mA current source/sink and all other functions remain active.
10. This parameter is guaranteed by design but is not production tested.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
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33972
5
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