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PDF MC33884 Data sheet ( Hoja de datos )
| Número de pieza | MC33884 | |
| Descripción | SWITCH MONITOR INTERFACE | |
| Fabricantes | Motorola Semiconductors | |
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MOTOROLA
Freescale Semiconductor, Inc.
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MC33884/D
Advance Information
Switch Monitor Interface
The MC33884 Switch Monitor Interface is a monolithic silicon
integrated circuit (IC) that performs switch monitoring functions.
The device provides efficient interface between electrical switches
and low voltage microprocessors. The MC33884 supplies switch
contact pull–up and pull–down current while monitoring the input
voltage level. All inputs are protected for transients when
implemented with an appropriate static discharge capacitor used
on the inputs.
There are four modes of operation – Sleep, Normal, Polling, and
Polling + INT Timer. Sleep mode reduces the current drain to a
quiescent current level of 10 m A and disables the IC. Normal mode
interrupts the microprocessor whenever any external switch
changes it’s OPEN or CLOSED state. Polling mode reads a switch
status periodically and interrupts the microprocessor only when an
external switch is sensed as being CLOSED. The Polling + INT
Timer mode is similar to the Polling mode, with the addition of an
interrupt being sent to the microprocessor if a switch is sensed
CLOSED or upon the internal interrupt timer ”timing out”. An
interrupt is always ultimately sent to the microprocessor in this
mode. All modes of operation are easily programmed via the Serial
Peripheral Interface (SPI) control.
The MC33884 has the following features:
• Full Operation with 7.0 V ≤ VPWR ≤ 26 V,
Limited Operation with 5.5 V ≤ VPWR ≤ 7.0 V
• Input Voltage Range: –14 V to 40 V
• Interfaces Directly to Microprocessors Using SPI Protocol
• 24–Lead Wide Body SOIC Package
• Wake–up on Change of Monitored Switch Status
• Programmable Wetting Current
• 4 Programmable Inputs to Monitor 4 Switch–to–Battery or
4 Switch–to–Ground Switches
• 6 (fixed function) Inputs to Monitor 6 Switch–to–Ground Switches
• 2 (fixed function) Inputs to Monitor 2 Switch–to–Battery Switches
• Standby Current During Normal Mode = 100 m A
• Quiescent Current in Sleep Mode < 10 m A
• Reset (RST) Input Defaults the Device to Sleep Mode
• Active Interrupt (INT) on Change of Switch State in Normal Mode
• 4 Modes of Operation
(Sleep, Normal, Polling, Polling + INT Timer)
• Designed to Operate –40°C ≤ TA ≤ 105°C
MC33884
SCALE 1:1
DW Suffix
24 Lead SOIC
CASE 751E
PIN CONNECTIONS
VDD
SO
SI
SP1
SG1
SG2
SG3
SB1
SP2
MASL
VPWR
GND
1
2
3
4
5
6
7
8
9
10
11
12
24 SCLK
23 CSB
22 VBG
21 SP4
20 SG6
19 SG5
18 SG4
17 SB2
16 SP3
15 INTB
14 SYNC
13 RSTB
ORDERING INFORMATION
Device
MC33884DW
MC33884DWR2
Operating
Temperature Package
Range
TA = – 40 to
105°C
SO–24
TA = – 40 to
105°C
SO–24
This document contains information on a new product. Specifications and information herein are subject to change without notice.
REV 2
www.0D9a/0ta1Sheet4U.com
© Motorola, Inc. 2001
www.DataSheet4U.com
For More Information On This Product,
Go to: www.freescale.com
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t
1 page  
Freescale Semiconductor, Inc.
MC33884
MAXIMUM RATINGS (All voltages are with respect to ground, unless otherwise noted)
Rating
Symbol
Value
VDD Supply Voltage
CSB, SI, SO, SCLK, RSTB, MASL, SYNC, INTB (Note 1)
– –0.3 to 7.0
– –0.3 to 7.0
VPWR Supply Voltage (Note 1)
Switch Input Voltage Range
– –16 to 50
– –14 to 40
Recommended Frequency of SPI Operation
– 3.0
ESD Voltage (Note 2)
Human Body Model (Notes 3, 4, 5)
Machine Model (Note 6)
Storage Temperature
Operating Case Temperature
Operating Junction Temperature
Lead Soldering Temperature (Note 7)
Maximum Junction Temperature
VESD1
VESD2
Tstg
TC
TJ
TSolder
–
4000
200
–55 to 150
–40 to 105
–40 to 150
260
–40 to 150
Thermal Resistance, Junction–to–Ambient
Plastic Package, 24 SOIC, Case 751E:
Pq JA
107
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 (CZAP = 100 pF, RZAP = 1500 W ).
4. All pins when tested individually.
5. 1 kV on VPWR and VDD when connected together.
6. ESD2 testing is performed in accordance with the Machine Model (CZAP = 100 pF, RZAP = 0 W ).
7. Lead soldering temperature limit is for 10 seconds maximum duration.
Unit
VDC
VDC
VDC
VDC
MHz
V
°C
°C
°C
°C
°C
°C/W
MOTOROLA TSG IC DEVICE DATAFor More Information On This Product,
Go to: www.freescale.com
5
5 Page 
Freescale Semiconductor, Inc.
MC33884
PIN FUNCTIONAL DESCRIPTION (continued)
SB1, SB2 Pins
The SB pins are switch–to–battery sensing inputs only.
Transient battery/supply voltages greater than 40 volts must
be clamped by external device. Surface mount 0805 MOVs
and transient voltage suppressors (TVS) are available in
SOT–23 packages. The sensed input is compared with an
internal 4.0 volts reference. Voltages greater than 4.0 volts are
interpreted as a CLOSED switch. Sensed voltages less than
4.0 V are interpreted as an OPEN switch. Programming can
set wetting currents or Tri–State the input. Programming
methods are provided in the following section.
SG1 – SG6 Pins
The SG pins are switch–to–ground inputs only. The input is
compared with the internal 4.0 volt reference. Voltages greater
than 4.0 volts are interpreted as an OPEN switch. Voltages
less than 4.0 V are interpreted as a CLOSED switch.
Programming can set the wetting currents or Tri–State the
input. Programming methods are provided in the following
section.
FUNCTIONAL DESCRIPTION
POWER UP
On initial power up, all MC33884 registers will be cleared
and the device will enter the Sleep mode. To exit Sleep mode
a valid command word is required to be received from the
microprocessor.
Polling mode allows the user to reduce quiescent
current by disabling sink and source currents during
swtich ”OFF” periods.
Sleep Command
Sleep mode can be entered by a SPI Sleep command or
asserting the RSTB pin. In Sleep mode all inputs are Tri–State
and all internal active pull up and pull down currents are
disabled. Sleep mode reduces the current drain to a quiescent
current level of 10 µA and disables the IC. Sleep mode
provides lowest quiescent current for the IC. Exit from sleep
mode requires a valid SPI RUN, TRI–STATE, or METALLIC
command.
RUN Command
Run command places the IC in one of three operating
modes; Normal, Polling, and Polling + INT Timer. The
command also programs the SP1 to SP4 sense inputs
(switch–to–battery [1] or switch–to–ground [0]). See Table 1.
Normal mode is the normal operating mode of the
MC33884. In Normal Mode the status of the input
switches are latched on falling edge of CSB and data is
sent back to MCU via SPI. All programmed
combinations of source and sink currents, used for
sensing purposes, are always active in this mode. In
normal mode an interrupt is generated and sent to the
microprocessor whenever an external switch changes
its OPEN or CLOSED state. Prior to a switch closing,
the MC33884 sources 0.75 mA of sustain current.
When the voltage at the input crosses the comparator
threshold, 14 mA of current is allowed to flow. The 14
mA wetting current shuts off after a 20 ms timer
expires.
Polling mode reads a switch status periodically and
interrupts the microprocessor only when an external
switch is sensed as being CLOSED. If the MC33884
senses all external switches to be OPEN, the Polling
mode of operation continues. If a switch is sensed
CLOSED, an interrupt is sent to the microprocessor
and the MC33884 transfers it’s operational mode to the
Normal mode. The Polling mode provides a reduction
in quiescent current by turning OFF all source and sink
currents during sensed switch OFF periods. The
Polling + INT Timer mode of operation is similar to the
Polling mode above, with the addition of an interrupt
being sent to the microprocessor if a switch is sensed
CLOSED or upon the internal interrupt timer ”timing
out”. An interrupt is always ultimately sent to the
microprocessor in this mode. The microprocessor can
be programmed to read (or ignore) the MC33884’s
reported switch status upon receiving the interrupt. If a
switch is sensed CLOSED, operation reverts
automatically to the Normal mode. If all switches are
sensed OPEN, and the wake–up timer (INT Timer)
times out, the MC33884 continues to operate in the
Polling + INT Timer mode. The wake–up timer duration
may be set much longer than the Polling time.
TRI–STATE Command
TRI–STATE command places all switch inputs into
Tri–State. All comparators on inputs are disabled in this mode.
The device will return [0] for the switch status.
SPI PROGRAMMING
The MC33884 uses the SPI in full duplex synchronous slave
mode for communication with the microprocessor. The
MC33884 is programmed via a 16 bit word command from the
MCU. The word is sent to the device with the MSB first. The
command word sent to the MC33884 sets the mode of
operation in the device. Data received back from the
MC33884 is the status of the sensed input switch on falling
edge of CSB. Sixteen clock periods are required for each
transmission to be valid. After the 16 clocks, CSB is returned
to the inactive state (logic [1]), command words are no longer
accepted into SI, and the SO pin is Tri–Stated. The response
to a SPI command returns status based on previous command
word. This previous command could be a hardware reset as
well as any of the other commands discussed in this section.
MOTOROLA TSG IC DEVICE DATAFor More Information On This Product,
Go to: www.freescale.com
11
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MC33884.PDF ] | |
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