MCZ33972AEKR2 Freescale Semiconductor, MCZ33972AEKR2 Datasheet - Page 12

• Manufacturer Part Number: MCZ33972AEKR2
• Description: IC DETECTOR MULT SWITCH 32-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33972AEKR2

• Applications: Switch Monitoring
• Interface: SPI
• Voltage - Supply: 8 V ~ 26 V
• Package / Case: 32-SOIC (7.5mm Width) Exposed Pad, 32-eSOIC, 32-HSOIC
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CONTROL AND PROTECTION CIRCUITRY:
the VPWR terminal. Characteristics are provided from 8.0 to
28 V for the device. Switch contact currents and the internal
logic supply are generated from the VPWR terminal. The
VDD supply terminal is used to set the SPI communication
voltage levels, current source for the SO driver, and pull-up
current on INT and CS.
required voltages to the internal monitor circuitry. The
temperature monitor is active in the Normal mode.
INTERFACE AND CONTROL:
Suppressed Wake-up 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).
reading inputs as analog. The 33972 device has two modes
of operation, Normal and Sleep.
12
33972
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
The 33972 is designed to operate from 5.5 V to 38/40 V on
The on-chip voltage regulator and bandgap supplies the
The 33972 Multiple Switch Detection Interface with
The device also features a 22-to-1 analog multiplexer for
MC33972 - Functional Block Diagram
Control & Protection
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Control & Protection
Interface & Control
Figure 7. Functional Internal Block Description
Multiplex Control
Interface & Control
Voltage Regulation
Interrupt/Wake-up
Oscillator & Clock
SWITCH PROGRAMMABLE INPUTS:
selectively detect switch closures to Ground or Battery. The
33972 device has 8 switch inputs capable of being
programmed to read switch-to-ground or switch-to-battery
contacts. The input is compared with a 4.0 V reference.
When programmed to be switch-to-battery, voltages greater
than 4.0 V are considered closed. Voltages less than 4.0 V
are considered open. The opposite holds true when inputs
are programmed as switch-to-ground.
SWITCH–TO-GROUND INPUTS:
detect switch closures to ground only. The input is compared
with a 4.0 V reference. Voltages greater than 4.0 V are
considered open. Voltages less than 4.0 V are considered
closed. Note: Each of these inputs may be used to supply
current to sensors external to a module.
Programmable switch detection inputs. These 8 inputs can
Switch detection interface inputs. These 14 inputs can
SW Prog Inputs
Switch Programmable
Switch–to-Ground
SG0 - SG13
SP0 - SP7
Inputs
Inputs
Analog Integrated Circuit Device Data
SW-GND Inputs
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