MC33884DW Freescale Semiconductor, MC33884DW Datasheet - Page 11

• Manufacturer Part Number: MC33884DW
• Description: IC SWITCH SDI MONITOR 24-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33884DW

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

SYNCHRONIZATION (SYNC)
during the Polling mode. The SYNC allows multiple 33884
ICs to poll the multiple inputs concurrently. The master
controls the polling period. The slave is allowed to shut down
it’s oscillator, thereby conserving current. When the slave
receives the SYNC signal from the master, the slave starts
the internal oscillator and reads the switch inputs.
INTERRUPT (INT)
33884. The INT pin is an open drain output with an internal
pull-up. In the Normal mode, a switch state change triggers
the INT pin. The INT pin and INT bit (flag) are latched on the
falling edge of CS. This procedure determines the interrupt
origin. The flag INT bit in the SPI word is the inverse of the
INT pin. The INT pin is cleared on the rising edge of CS. The
INT pin is active only during the ON time (when sink and
source currents are active) in the Polling mode.
RESET (RST)
When asserted, the 33884 will reset all internal registers,
timers, and enters a Sleep mode (with all switch inputs in a
Tri-State condition). Only an MCU SPI command word will
wake the 33884 from a Sleep state. The RST pin may be
controlled directly from a general purpose input/output
(GPIO) pin or from a system/MCU reset.
BANDGAP VOLTAGE (VBG)
ground for standard wetting and sustain currents. The device
is tested with a 0.1 percent value, but a standard 1.0 percent
could be used to function properly.
VOLTAGE POWER (VPWR)
pin for the 33884. The VPWR pin requires external reverse
battery/supply and transient protection. Maximum input
Analog Integrated Circuit Device Data
Freescale Semiconductor
The Synchronization (SYNC) input is used by the slave IC
The Interrupt (INT) pin is an interrupt output from the
The Reset (RST) pin is active low reset input to the 33884.
The Bandgap Voltage (VBG) pin requires a 130 kΩ to
The Voltage Power (VPWR) pin is battery/supply source
voltage on VPWR is 40 V. All wetting currents and sustain
currents are derived from VPWR.
SWITCH PINS (SP1 : SP4)
(SP1- P4) to read switch-to-ground or switch-to-battery/
supply contacts. Transient battery/supply voltages greater
than 40 V must be clamped by an external device. Surface
mount 0805 MOVs and transient voltage suppressors (TVS)
are available in SOT-23 packages. The sensed input is
compared with an internal 4.0 V reference. When
programmed to sense switch-to-battery, sensed voltages
greater than 4.0 V are interpreted as a CLOSED switch, while
sensed voltages less than 4.0 V are interpreted as an OPEN
switch. The opposite holds true when inputs are programmed
to sense switch-to-ground. Further programming can set the
wetting currents or make the inputs Tri-State. Programming
methods are provided in the following section.
SWITCH-TO-BATTERY (SB1 AND SB2)
Transient battery/supply voltages greater than 40 V must be
clamped by an external device. Surface mount 0805 MOVs
and transient voltage suppressors (TVS) are available in
SOT-23 packages.
reference. Voltages greater than 4.0 V are interpreted as a
CLOSED switch, while sensed voltages less than 4.0 V are
interpreted as an OPEN switch. Programming can set wetting
currents or Tri-State the input. Programming methods are
provided in the following section.
SWITCH-TO-GROUND (SG1 : SG6)
input is compared with the internal 4.0 V reference. Voltages
greater than 4.0 volts are interpreted as an OPEN switch.
Voltages less than 4.0 V are interpreted as a CLOSED
switch. Programming can set the wetting currents or Tri-State
the input. Programming methods are provided in the
following section.
The 33884 has four programmable switch sense inputs
The two Switch-to-Battery (SB) pins sense inputs only.
The sensed input is compared with an internal 4.0 V
The six Switch-to-Ground (SG) pins are inputs only. The
FUNCTIONAL PIN DESCRIPTION
FUNCTIONAL DESCRIPTION
33884
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