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MC33972DWB Scheda tecnica(PDF) 10 Page - Motorola, Inc

Il numero della parte MC33972DWB
Spiegazioni elettronici  Multiple Switch Detection Interface with Suppressed Wake-Up
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Produttore elettronici  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC33972DWB Scheda tecnica(HTML) 10 Page - Motorola, Inc

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33972
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
10
WAKE
The WAKE terminal is an open-drain output and a wake-up
input. The terminal is designed to control a power supply
Enable terminal. In the Normal mode, the WAKE terminal is
LOW. In the Sleep mode, the WAKE terminal is HIGH. The
WAKE
terminal has a pullup to the internal +5.0 V supply.
In Sleep mode with the WAKE terminal HIGH, falling edge of
WAKE
will place the 33972 in Normal mode. In Sleep mode with
VDD applied, the INT terminal 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.
VPWR
The VPWR terminal is battery input and Power-ON Reset to
the 33972 IC. The VPWR terminal 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 terminal.
VDD
The VDD input terminal is used to determine logic levels on
the microprocessor interface (SPI) terminals. Current from VDD
is used to drive SO output and the pullup current for CS and INT
terminals. VDD must be applied for wake-up from negative edge
of CS or INT.
GND
The GND terminal provides ground for the IC as well as
ground for inputs programmed as switch-to-battery inputs.
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 4.0 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 Table 1 through Table 6 in the Device Operation
section of this datasheet beginning on page 12. Voltages
greater than the VPWR supply voltage will source current
through the SP inputs to the VPWR terminal. Transient battery
voltages greater than 40 V must be clamped by an external
device.
SG0:SG13
The SGn terminals are switch-to-ground inputs 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. Programming features are defined in
Table 1 through Table 6 in the Device Operation section of this
datasheet beginning on page 12. Voltages greater than the
VPWR supply voltage will source current through the SG inputs
to the VPWR terminal. Transient battery voltages greater than
40 V must be clamped by an external device.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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