MC33993DWB Freescale Semiconductor, MC33993DWB Datasheet - Page 12

• Manufacturer Part Number: MC33993DWB
• Description: IC SWITCH I/O INTERFACE 32-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33993DWB

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

POWER SUPPLY
the VPWR pin. Characteristics are provided from 8.0 V to
16 V for the device. Switch contact currents and the internal
logic supply are generated from the VPWR pin. The VDD
supply pin is used to set the SPI communication voltage
levels, current source for the SO driver, and pull-up current
on INT and CS.
reduce quiescent current. If V
is in Normal mode, the device will remain in Normal mode. If
V
Sleep mode until wake-up input is received (WAKE high to
low, switch input or interrupt timer expires).
communication and will not allow the device to wake up from
INT and CS pins.
POWER-ON RESET (POR)
and place the device in Normal mode.
Command are as follows:
MODES OF OPERATION
Sleep mode. A discussion on Normal mode begins below.
A discussion on Sleep mode begins on page 17.
12
33993
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
DD
The 33993 is designed to operate from 5.5 V to 40 V on
The VDD supply may be removed from the device to
Removing V
Applying V
Default settings from Power-ON Reset via V
• Programmable Switch – Set to Switch to Battery
• All Inputs Set as Wake-Up
• Wetting Current On (16 mA)
• Wetting Current Timer On (20 ms)
• All Inputs Tri-State
• Analog Select 00000 (No Input Channel Selected)
The 33993 has two operating modes, Normal mode and
is removed in Sleep mode, the device will remain in
PWR
DD
to the device will cause a Power-ON Reset
from the device disables SPI
DD
is removed while the device
PWR
OPERATIONAL MODES
or Reset
NORMAL MODE
the 33993 be programmed through the SPI.
are listed below. Further explanation of each register is
provided in subsequent paragraphs.
in Normal mode. Switch states are latched into the input
register on the falling edge of
cleared on the rising edge of CS. However,
on rising edge of
communication (
being missed by the MCU.
Normal mode may be entered by the following events:
• Application of V
• Change-of-Switch State (when enabled)
• Falling Edge of
• Falling Edge of
• Falling Edge of
• Interrupt Timer Expires
Only in Normal mode with V
The registers that may be programmed in Normal mode
•
•
•
•
•
•
•
•
Figure 6
Logic [1])
Programmable Switch Register
Wake-Up / Interrupt Register
Command )
Wetting Current Register
Wetting Current Timer Register
Enable Command )
Tri-State Register
Analog Select Register
Calibration of Timers
Reset
is a graphical description of the device operation
(Reset Command )
CS
CS
low). This prevents switch states from
if a switch has closed during SPI
PWR
WAKE
INT
CS
Analog Integrated Circuit Device Data
(Tri-State Command )
(with V
(with V
to the IC
(Calibration Command )
(Analog Command )
CS
DD
(Metallic Command )
DD
DD
. The
applied can the registers of
(Wake-Up / Interrupt
= 5.0 V)
Freescale Semiconductor
= 5.0 V and
(Wetting Current Timer
(Settings Command )
INT
to the MCU is
INT
WAKE
will not clear
at