MCZ33884EG Freescale Semiconductor, MCZ33884EG Datasheet - Page 9

• Manufacturer Part Number: MCZ33884EG
• Description: IC MULTIPLE CONTACT MON 24-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33884EG

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 24-SOIC (7.5mm Width)
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

interface between external electrical system switches and
low voltage microprocessors via a Serial Peripheral Interface
(SPI). The 33884 monitors the OPEN/CLOSED status of
multiple external switches used in a system. The 33884
features four programmable Switch-to-Ground or Battery
sense inputs, 6 Switch-to-Ground sense inputs, 2 Switch-to-
Battery sense inputs, programmable Wake up Timer,
programmable Interrupt Timer, and programmable wetting
current settings. All inputs are protected for ESD transients
when implemented with the appropriate ESD capacitor.
aerospace, robotic, process & control, automotive, and
security systems. Potential applications exist where switch
status verification for safety, fault tolerant operation, or
process control function purposes are critical.
Polling, and Polling + INT Timer.
between system switch contacts and a microprocessor. Each
33884 input provides the switch contact with high levels of
wetting current during switch closure. After the input switch
has been closed for 20 ms, the wetting current is reduced,
hence reducing power dissipation in the IC. The response to
a SPI command will always return Switch Status, Master/
Slave, INT Flag, and Mode settings. The following section
describes the programming modes and features of the
33884.
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33884 is a monolithic integrated circuit designed to
There are numerous applications for this device in aircraft,
The 33884 has four modes of operation: Sleep, Normal,
The 33884 is designed to provide a robust interface
FUNCTIONAL DESCRIPTION
INTRODUCTION
MICROPROCESSOR INTERFACE
serial clock frequencies in excess of 5.0 MHz may be used for
programming and reading switch input status. Figure 4 shows
the configuration between an MCU and one 33884.
is very useful in a variety of other applications, i.e., computer,
telecommunications, and industrial fields. It is parametrically
specified over an input battery/supply voltage of 9.0 to 16.0 V
but is designed to operate over a considerably wider range of
5.5 to 26.5 V.
system when implemented in a parallel or serial
configuration.
serial configurations respectively. When using the Serial
configuration, 32 clock cycles are required for a complete
transfer of data to the 33884.
The M33884 directly interfaces to 3.3 or 5.0 V MCU. SPI
The 33884, though originally designed for automotive use,
Two or more 33884 devices may be used in a module
Figure 4. SPI Interface with Microprocessor
Microcontroller
MC68HCXX
16 Bit Shift Register
Receive
Parallel
Figure 5
Ports
Buffer
and
MOSI
MISO
SCLK
INT
Figure 6
RST
INT
CS
SO
FUNCTIONAL DESCRIPTION
SI
show the parallel and
16 Bit Shift Register
33884
To Logic
INTRODUCTION
33884
9