MC33972EW Freescale Semiconductor, MC33972EW Datasheet - Page 11

• Manufacturer Part Number: MC33972EW
• Description: IC SWITCH DETECT SPI 32-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33972EW

• Applications: *
• Interface: *
• Package / Case: 32-SOIC (7.5mm Width)
• Mounting Type: Surface Mount
• Voltage - Supply: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WAKE-UP (WAKE)
input. The pin is designed to control a power supply Enable
pin. In the Normal mode, the
mode, the
the internal + 5.0 V supply.
of
with V
of
device in Sleep mode,
BATTERY INPUT (VPWR)
33972 IC. The VPWR pin requires external reverse battery
and transient protection. Maximum input voltage on VPWR is
50 V. All wetting, sustain, and internal logic current is
provided from the VPWR pin.
VOLTAGE DRAIN SUPPLY (VDD)
microprocessor interface (SPI) pins. Current from VDD is
used to drive SO output and the pull-up current for
INT
edge of
GROUND (GND)
for inputs programmed as switch-to-battery inputs.
Analog Integrated Circuit Device Data
Freescale Semiconductor
WAKE
WAKE
The
In Sleep mode with the
The VPWR pin is battery input and Power-ON Reset to the
The VDD input pin is used to determine logic levels on the
The GND pin provides ground for the IC as well as ground
pins. VDD must be applied for wake-up from negative
DD
WAKE
CS
applied, the
will place the 33972 in Normal mode. In Sleep mode
to wake up the device. If V
WAKE
or
pin is an open-drain output and a wake-up
INT
pin is HIGH. The
.
INT
INT
pin must be HIGH for negative edge
WAKE
does not affect
WAKE
pin HIGH, the falling edge
WAKE
pin is LOW. In the Sleep
DD
is not applied to the
pin has a pull-up to
WAKE
operation.
CS
and
PROGRAMMABLE SWITCHES (SP0 : SP7)
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. Programming features
are defined in
Device Operation
page 13. Voltages greater than the VPWR supply voltage will
source current through the SP inputs to the VPWR pin.
Transient battery voltages greater than 38/40 V must be
clamped by an external device.
SWITCH-TO-GROUND INPUTS (SG0 : SG13)
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. Programming features are defined in
Table 6
section of this datasheet beginning on page 13. Voltages
greater than the VPWR supply voltage will source current
through the SG inputs to the VPWR pin. Transient battery
voltages greater than 40 V must be clamped by an external
device.
The 33972 device has 8 switch inputs capable of being
The SGn pins are switch-to-ground inputs only. The input
through
Table 6
Table 11
section of this datasheet beginning on
through
in the
FUNCTIONAL PIN DESCRIPTION
Table 11
Functional Device Operation
FUNCTIONAL DESCRIPTION
in the
Functional
33972
11