MCZ33975AEKR2 Freescale Semiconductor, MCZ33975AEKR2 Datasheet - Page 21

• Manufacturer Part Number: MCZ33975AEKR2
• Description: IC SWITCH DETECT MULT ENH 32SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33975AEKR2

• Applications: Automotive
• Interface: SPI
• Voltage - Supply: 5.5 V ~ 28 V
• Package / Case: 32-SOIC (7.5mm Width) Exposed Pad, 32-eSOIC, 32-HSOIC
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 17. 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 32mA of contact wetting current
Analog Integrated Circuit Device Data
Freescale Semiconductor
Wetting Current Timer
Enable Command
Timer ON = 1
Timer OFF = 0
(Default state = 1)
Tri-state Command
Input Tri-state=1
Input Active = 0
Calibration Command
(Default state -
uncalibrated)
Sleep Command
(See
Mode on page
22)
Reset Command
SO Response Will
Always Send
SO Response Will
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 (32mA)
• Wetting current timer on (20ms)
• 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
Sleep
MSB
therm
flg
therm
flg
0
0
0
0
0
0
0
RST
flg
RST
flg
0
0
0
0
0
0
1
SP7
Command Bits
SP7
0
0
0
0
0
0
1
Table 16. Serial Output (SO) Bit Data
SP6
Type of Input
SP6
0
0
0
0
0
0
1
SP5
SP5
SG
SP
0
1
1
1
1
1
1
SP4
SP4
1
0
0
0
0
1
1
SP3
SP3
1
0
0
1
1
0
1
Switch to Ground
Switch to Ground
Switch to Battery
Switch to Battery
SP2
Programmed
SP2
1
0
1
0
1
0
1
Input
SP1
N/A
N/A
SP1
X
X
X
X
X
X
X
SP0 SG13 SG12 SG11 SG10 SG9
SP0 SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6
X
X
X
X
X
X
X
SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6
SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6
X
X
X
X
X
Voltage on
SPn < 4.0V
SPn > 4.0V
SPn < 4.0V
SPn > 4.0V
SGn < 4.0V
SGn > 4.0V
Input Pin
will be source for 20ms. The
switch status is acknowledged by the microprocessor. It is
critical to understand
edge of
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
interrupt command) from the 33975 device and read the
switch states on a periodic basis. Switch activation and
deactivation faster than the MCU read rate will not be
acknowledged.
Setting Bits
X
X
X
X
X
If desired the user may disable interrupts (wake-up/
X
X
X
X
X
CS
if a switch closure occurs while the
X
X
X
X
X
Figure
X
X
X
X
X
SO SPI Bit
SG8
6, page 11, shows the interaction
X
X
X
X
X
INT
1
0
0
1
1
0
SG7
SP7
SP7
X
X
X
will not be cleared on the rising
FUNCTIONAL DEVICE OPERATION
SG6
SP6
SP6
INT
X
X
X
SG5
pin will remain low until
timer
SP5
SG5
SP5
SG5
SG5
int
X
X
OPERATIONAL MODES
SG4
timer
SP4
SG4
SP4
SG4
SG4
int
X
X
INT
LSBI
SG3
timer
SG3 SG2 SG1 SG0
SG3 SG2 SG1 SG0
SG3 SG2 SG1 SG0
SP3
SP3
int
and
X
X
CS
SG2
scan
timer
SP2
SP2
CS
X
X
is low. The
pins.
SG1
timer
scan
SP1
SP1
X
X
33975
scan
timer
SG0
SP0
SP0
X
X
21