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Motorola Electronic Components Datasheet

MC33884 Datasheet

SWITCH MONITOR INTERFACE

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MOTOROLA
Freescale Semiconductor, Inc.
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–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
www.DataSheet4U.com
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Motorola Electronic Components Datasheet

MC33884 Datasheet

SWITCH MONITOR INTERFACE

No Preview Available !

MC33884
Freescale Semiconductor, Inc.
SP1
SP2
SP3
SP4
SG1
SG2
SG3
SG4
SG5
SG6
SB1
SB2
V DD
VPWR
VSS
V BG
Switch–to–Ground
and
Switch–to–Battery
Sense Inputs
(x4)
Programmable Input Blocks (1–4)
Metallic or Non–metallic
Enable or Disable Input Block (Tri–State)
Switch–to–Ground
Sense Inputs
(x6)
Switch–to–Battery
Sense Inputs
(x2)
Fixed Input Blocks
GND (1–6)
Switch–Ground, Metallic or Non–metallic,
Enable or Disable FIB (Tri–State)
Fixed Input Blocks
Battery (1–2)
Switch–Batt, Metallic or Non–metallic,
Enable or Disable FIB (Tri–State)
SPI Decode
PIB Configure, FIB/PIB Tri–State
FIB/PIB Metallic
SPI Interface
VDD, V+
Distribution
(To all input blocks)
Quiescent
Current
Control
SPI Encode
Mode Switch Status
Mode Control
Normal, Polling, Sleep
Polling Mode
Oscillator
Wake–up
Slave Sync
Master/Slave Select
CSB
SI
SO
SCLK
INTB
RSTB
SYNC
MASL
Figure 1. Internal Block Diagram
2 For More Information On This ProduMcOtT, OROLA TSG IC DEVICE DATA
Go to: www.freescale.com


Part Number MC33884
Description SWITCH MONITOR INTERFACE
Maker Motorola
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MC33884 Datasheet PDF






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