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MC33972TDWB Folha de dados(PDF) 11 Page - Freescale Semiconductor, Inc

Nome de Peças MC33972TDWB
Descrição Electrónicos  Multiple Switch Detection Interface with Suppressed Wake-Up
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Fabricante Electrônico  FREESCALE [Freescale Semiconductor, Inc]
Página de início  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC33972TDWB Folha de dados(HTML) 11 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
11
33972
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
WAKE-UP (WAKE)
The WAKE pin is an open-drain output and a wake-up
input. The pin is designed to control a power supply Enable
pin. In the Normal Mode, the WAKE pin is LOW. In the Sleep
Mode, the WAKE pin is HIGH. The WAKE pin has a pull-up to
the internal +5.0V supply.
In Sleep Mode with the WAKE pin HIGH, the falling edge
of WAKE will place the 33972 in Normal Mode. In Sleep Mode
with VDD applied, the INT pin must be HIGH for negative edge
of WAKE to wake up the device. If VDD is not applied to the
device in Sleep Mode, INT does not affect WAKE operation.
BATTERY INPUT (VPWR)
The VPWR pin is battery input and Power-ON Reset to the
33972 IC. The VPWR pin requires external reverse battery
and transient protection. Maximum input voltage on VPWR is
50V. All wetting, sustain, and internal logic current is provided
from the VPWR pin.
VOLTAGE DRAIN SUPPLY (VDD)
The VDD input pin is used to determine logic levels on the
microprocessor interface (SPI) pins. Current from VDD is
used to drive SO output and the pull-up current for CS and
INT
pins. VDD must be applied for wake-up from negative
edge of CS or INT.
GROUND (GND)
The GND pin provides ground for the IC as well as ground
for inputs programmed as switch-to-battery inputs.
PROGRAMMABLE SWITCHES (SP0:SP7)
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 4.0V reference. When
programmed to be switch-to-battery, voltages greater than
4.0V are considered closed. Voltages less than 4.0V are
considered open. The opposite holds true when inputs are
programmed as switch-to-ground. Programming features are
defined in Table 6 through Table 11 in the functional Device
Operation section of this datasheet beginning on 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 38/40V must be clamped by an
external device.
SWITCH-TO-GROUND INPUTS (SG0:SG13)
The SGn pins are switch-to-ground inputs only. The input
is compared with a 4.0V reference. Voltages greater than
4.0V are considered open. Voltages less than 4.0V are
considered closed. Programming features are defined in
Table 6 through Table 11 in the functional Device Operation
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 40V must be clamped by an external
device.


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