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PDF MC33993 Data sheet ( Hoja de datos )
| Número de pieza | MC33993 | |
| Descripción | Multiple Switch Detection Interface | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Document order number: MC33993/D
Rev 2.0, 07/2003
Advance Information
Multiple Switch Detection Interface
The 33993 Multiple Switch Detection Interface 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 33993 device has two modes of operation, Sleep and Normal. The Sleep
mode provides low quiescent current and enables the wake-up features of the
device. 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 33993 is packaged in the 32-pin wide-body SOIC, reducing circuit board
area. Low quiescent current makes the 33993 ideal for automotive and industrial
products requiring low sleep state currents. The internal block diagram of the
33993 is illustrated in Figure 1, page 2.
33993
MULTIPLE SWITCH
DETECTION INTERFACE
Features
• Designed to Operate 5.5 V ≤ VPWR ≤ 26 V
• Switch Input Voltage Range -14 V to VPWR, 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
• VPWR Standby Current 100 µA Typical, VDD Standby Current 20 µA Typical
• Active Interrupt (INT) on Change-of-Switch State
DWB SUFFIX
CASE 1324
32-LEAD SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33993DWB/R2 -40°C to 125°C 32 SOICW
VBAT
VBAT
VBAT
33993 Simplified Application Diagram
33993
SP0
SP1
VPWR
SP7
SG0
SG1
VDD
WAKE
SI
SCLK
CS
SO
INT
AMUX
SG12
SG13
GND
Power Supply
LVI
Enable
Watchdog
VDD Reset
VDD
MCU
MOSI
SCLK
CS
MISO
INT
AN0
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Motorola, Inc. 2003
1 page  
STATIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions of 3.1 V ≤ VDD ≤ 5.25 V, 8.0 V ≤ VPWR ≤ 16 V, -40°C ≤ TC ≤ 125°C, unless otherwise noted.
Where applicable, typical values reflect the parameter’s approximate average value with VPWR = 13 V, TA = 25°C.
Characteristic
Symbol Min Typ Max Unit
POWER INPUT
Supply Voltage
Supply Voltage Range Quasi-Functional (Note 7)
Fully Operational
Supply Voltage Range Quasi-Functional (Note 7)
V
VPWR (qf)
5.5
–
8.0
VPWR (fo)
8.0
–
26
VPWR (qf)
26
–
40
Supply Current
All Switches Open, Normal Mode, Tri-State Disabled
IPWR(on)
–
mA
2.0 4.0
Sleep State Supply Current
Scan Timer = 64 ms, Switches Open
IPWR(ss)
40
µA
70 100
Logic Supply Voltage
Logic Supply Current
All Switches Open, Normal Mode
VDD
IDD
3.1 – 5.25 V
mA
– 0.25 0.5
Sleep State Logic Supply Current
Scan Timer = 64 ms, Switches Open
IDD(ss)
µA
– 10 20
SWITCH INPUT
Pulse Wetting Current Switch-to-Battery (Current Sink)
IPulse 12 15 18 mA
Pulse Wetting Current Switch-to-Ground (Current Source)
IPulse 12 16 18 mA
Sustain Current Switch-to-Battery Input (Current Sink)
Isustain 1.8 2.0 2.2 mA
Sustain Current Switch-to-Ground Input (Current Source)
Isustain 1.8 2.0 2.2 mA
Sustain Current Matching Between Channels on Switch-to-Ground Inputs
IMatch
%
ISUS(MAX) - ISUS(MIN)
ISUS(MIN)
X 100
– 2.0 4.0
Input Offset Current when Selected as Analog
Input Offset Voltage when Selected as Analog
V(SP&SGinputs) to AMUX Output
Ioffset
Voffset
-2.0 1.4
-10 2.5
2.0 µA
mV
10
Analog Operational Amplifier Output Voltage
Sink 250 µA
VOL mV
– 10 30
Analog Operational Amplifier Output Voltage
Source 250 µA
VOH
VDD - 0.1
–
V
–
Switch Detection Threshold
Vth
3.70 4.0
4.3 V
Switch Input Voltage Range
Vin -14 – 40 V
Temperature Monitor (Note 8), (Note 9)
TLIM 155 – 185 °C
Temperature Monitor Hysteresis (Note 9)
TLIM(hys)
5.0
10
15 °C
Notes
7. Device operational. Table parameters may be out of specification.
8. Thermal shutdown of 16 mA pull-up and pull-down current sources only. 2.0 mA current source/sink and all other functions remain active.
9. This parameter is guaranteed by design but is not production tested.
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33993/D
5
5 Page 
MCU INTERFACE DESCRIPTION
The 33993 device directly interfaces to a 3.3 V or 5.0 V
microcontroller unit (MCU). SPI serial clock frequencies up to
6.0 MHz may be used for programming and reading switch
input status (production tested at 4.16 MHz). Figure 5 illustrates
the configuration between an MCU and one 33993.
Serial peripheral interface (SPI) data is sent to the 33993
device through the SI input pin. As data is being clocked into the
SI pin, status information is being clocked out of the device by
the SO output pin. The response to a SPI command will always
return the switch status, interrupt flag, and thermal flag. Input
switch states are latched into the SO register on the falling edge
of the chip select (CS) pin. Twenty-four bits are required to
complete a transfer of information between the 33993 and the
MCU.
MC68HCXX
Microcontroller
Shift Register
MOSI
MISO
33993
SI
24-Bit Shift Register
SO
MC68HCXX
Microcontroller
Shift Register
MOSI
MISO
SCLK
Parallel
Ports
INT
33993
SI
SO
SCLK
CS
INT
33993
SI
SO
SCLK
CS
INT
SCLK
Figure 6. SPI Parallel Interface with Microprocessor
Receive
Buffer
Parallel
Ports
INT
To Logic
CS
INT
Figure 5. SPI Interface with Microprocessor
Two or more 33993 devices may be used in a module
system. Multiple ICs may be SPI-configured in parallel or serial.
Figures 6 and 7 show the configurations. When using the serial
configuration, 48-clock cycles are required to transfer data in/
out of the ICs.
MC68HCXX
Microcontroller
MOSI
Shift Register
MISO
SCLK
Parallel
Ports
INT
33993
SI
SO
SCLK
CS
INT
33993
SI
SO
SCLK
CS
INT
Figure 7. SPI Serial Interface with Microprocessor
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33993/D
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet MC33993.PDF ] | |
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