MCZ33993EW Freescale Semiconductor, MCZ33993EW Datasheet - Page 17

• Manufacturer Part Number: MCZ33993EW
• Description: IC MULTIPLE SWITCH DETECT 32SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33993EW

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

Table 16. Serial Output (SO) Response Register
EXAMPLE OF NORMAL MODE OPERATION
the states of the programmable internal control registers. A
typical application may have the following settings:
generated with each switch contact change of state (open-to-
close or close-to-open) and 16 mA of contact wetting current
will be source for 20 ms. The INT pin will remain low until
switch status is acknowledged by the microprocessor. It is
critical to understand INT will not be cleared on the rising
edge of CS if a switch closure occurs while CS is low. The
maximum duration a switch state change can exist without
acknowledgement depends on the software response time to
the interrupt.
between changing input states and the INT and CS pins.
interrupt command) from the 33993 device and read the
switch states on a periodic basis. Switch activation and
deactivation faster than the MCU read rate will not be
acknowledged.
Sleep mode only with a valid sleep command.
Table 15. Serial Output (SO) Bit Data
Analog Integrated Circuit Device Data
Freescale Semiconductor
SO Response Will
Type of Input
Always Send
The operation of the device in Normal Mode is defined by
• Programmable Switch – Set to Switch-to-Ground
• All Inputs Set as Wake-Up
• Wetting Current On (16 mA)
• Wetting Current Timer On (20 ms)
• All inputs Tri-State-Disabled (comparator is active)
• Analog select 00000 (no input channel selected)
With the device programmed as above, an interrupt will be
If desired the user may disable interrupts (wake up/
The 33993 device will exit the Normal mode and enter the
SP
Figure
Programmed
them
flg
Switch to
Switch to
Switch to
Switch to
Ground
Ground
Battery
Battery
Input
4, page 8, shows the interaction
int
flg
SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
SPn < 4.0 V
SPn > 4.0 V
SPn < 4.0 V
SPn > 4.0 V
Voltage on
Input Pin
SO SPI Bit
1
0
0
1
SG1
3
SLEEP MODE
Sleep mode may be entered only by sending the sleep
command. All register settings programmed in Normal mode
will be maintained in Sleep mode.
when any of the following events occur:
Sleep mode. However removing V
Sleep mode will disable a wake-up from falling edge of INT
and CS.
first SO data message is not valid.
programmable timers for Sleep mode, the interrupt timer and
the scan timer, as shown in
When the timer expires, an interrupt is generated and the
device enters Normal mode.
programmable settings of the Interrupt timer.
Table 15. Serial Output (SO) Bit Data
Type of Input
SG1
2
Sleep mode is used to reduce system quiescent currents.
The 33993 will exit Sleep mode and enter Normal mode
• Input Switch Change of State (when enabled)
• Interrupt Timer Expire
• Falling Edge of
• Falling Edge of
• Falling Edge of
• Power-ON Reset (POR)
The V
Note In cases where CS is used to wake the device, the
The sleep command contains settings for two
The interrupt timer is used as a periodic wake-up timer.
Logic [1])
SG
SG1
1
DD
SG1
0
supply may be removed from the device during
SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0
Programmed
Input
N/A
N/A
WAKE
INT
CS
LOGIC COMMANDS AND REGISTERS
(with V
(with V
FUNCTIONAL DEVICE OPERATION
Table
Table 18
SGn < 4.0 V
SGn > 4.0 V
Voltage on
DD
DD
Input Pin
DD
17.
= 5.0 V)
= 5.0 V and
from the device in
shows the
SO SPI Bit
WAKE
1
0
at
33993
17