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MC33884 Datasheet

  • MC33884

  • SWltch Monlter Interface

  • Motorola   Motorola

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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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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鈥搖p and pull鈥揹own 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 鈥?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鈥檚 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 鈥漷iming out鈥? 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:
鈥?/div>
Full Operation with 7.0 V
鈮?/div>
VPWR
鈮?/div>
26 V,
Limited Operation with 5.5 V
鈮?/div>
VPWR
鈮?/div>
7.0 V
鈥?/div>
Input Voltage Range: 鈥?4 V to 40 V
鈥?/div>
Interfaces Directly to Microprocessors Using SPI Protocol
鈥?/div>
24鈥揕ead Wide Body SOIC Package
鈥?/div>
Wake鈥搖p on Change of Monitored Switch Status
鈥?/div>
Programmable Wetting Current
鈥?/div>
4 Programmable Inputs to Monitor 4 Switch鈥搕o鈥揃attery or
4 Switch鈥搕o鈥揋round Switches
鈥?/div>
6 (fixed function) Inputs to Monitor 6 Switch鈥搕o鈥揋round Switches
鈥?/div>
2 (fixed function) Inputs to Monitor 2 Switch鈥搕o鈥揃attery Switches
鈥?/div>
Standby Current During Normal Mode = 100
m
A
鈥?/div>
Quiescent Current in Sleep Mode < 10
m
A
鈥?/div>
Reset (RST) Input Defaults the Device to Sleep Mode
鈥?/div>
Active Interrupt (INT) on Change of Switch State in Normal Mode
鈥?/div>
4 Modes of Operation
(Sleep, Normal, Polling, Polling + INT Timer)
鈥?/div>
Designed to Operate 鈥?0擄C
鈮?/div>
TA
鈮?/div>
105擄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
23
22
21
20
19
18
17
16
15
14
13
SCLK
CSB
VBG
SP4
SG6
SG5
SG4
SB2
SP3
INTB
SYNC
RSTB
ORDERING INFORMATION
Device
MC33884DW
MC33884DWR2
Operating
Temperature
Range
TA = 鈥?40 to
105擄C
TA = 鈥?40 to
105擄C
Package
SO鈥?4
SO鈥?4
This document contains information on a new product. Specifications and information herein are subject to change without notice.
REV 2
09/01
漏
Motorola, Inc. 2001
t

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