MCZ33975AEKR2 Freescale Semiconductor, MCZ33975AEKR2 Datasheet - Page 26

• 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

VBAT
inputs tri-state) required to set up the device to drive a
MOSFET are as follows:
disable), the MOSFET gate will be pulled to ground. From this
point forward the MOSFET may be turned on and off by
sending the settings command:
open load detection. This is done by using an input
comparator. With the SGn input in tri-state, the load will pull
up the input to battery. With the load open, the SGn pin is
pulled down to ground through an external resistor. The open
load is indicated by a logic [1] in the SO data bit.
voltage in the MOSFET ON state. By sourcing 4.0 mA of
26
33975
TYPICAL APPLICATIONS
OPERATIONAL MODES
The sequence of commands (from Normal Mode with
• wetting current timer enable command –Disable SPn
• metallic command –Set SPn to 16/32 mA or 2.0/4.0 mA
• settings command –Set SPn as switch-to-battery (refer
• tri-state command –Disable tri-state for SPn (refer to
After the tri-state command has been sent (tri-state
• settings command –SPn as switch-to-ground
• settings command –SPn as switch-to-battery
Monitoring of the MOSFET drain in the OFF state provides
The analog command may be used to monitor the drain
wetting current timer (refer to
gate drive current (refer to
to
Table
(MOSFET ON).
(MOSFET OFF).
Table
Figure 15. MOSFET or LED Driver Output
10, page 18).
6, page 16).
100kΩ
750Ω
SG13
SG0
SP0
32
mA
32
mA
16
mA
32
mA
Table
V
V
V
PWR
PWR
PWR
4.0 V Ref
4.0 V Ref
Table
V
V
V
PWR
PWR
PWR
8, page 17).
4.0 V
4.0
mA
2.0 mA
4.0
mA
4.0
mA
Ref
Comparator
Comparator
9, page 18).
Comparator
+
-
+
-
+
-
To SPI
To SPI
SG13
To SPI
SG0
SG0
AMUX
Table 21. Sleep Mode Power Supply
current to the 750 Ω resistor, the analog voltage on the SGn
pin will be approximately:
does the voltage on the SGn pin. With the SGn pin selected
as analog, the MCU may perform the A/D conversion.
loads is not recommended. Inductive fly-back voltages
greater than V
send signals from one module to another. Operation is similar
to the gate control of a MOSFET.
recommended but not required. The switch-to-ground inputs
are recommended for LED application. To drive the LED use
the following commands:
using the tri-state command:
commands in Normal Mode.
Multiple 33975 Devices in a Module System
Mode operation may be done in several ways.
shows several system configurations for power between the
MCU and the 33975 and their specific requirements for
functionality.
SPI control may be done in parallel or serial. However when
parallel mode is used, each device is addressed
independently (refer to
MCU
VDD
5.0V
5.0V
As the voltage on the drain of the MOSFET increases, so
Using this method for controlling unclamped inductive
The SP0–SP7 pins of this device may also be used to
For LED applications a resistor in series with the LED is
• wetting current timer enable command –Disable SGn
• metallic command –Set SGn to 32mA.
From this point forward the LED may be turned on and off
• tri-state command –Disable tri-state for SGn (LED ON).
• tri-state command –Enable tri-state for SGn (LED
These parameters are easily programmed via SPI
Connecting power to the 33975 and the MCU for Sleep
Multiple 33975 devices may be used in a module system.
0V
0V
wetting current timer.
OFF).
33975
VDD
5.0V
5.0V
0V
0V
PWR
V
All wake-up conditions apply. (Refer to
Mode, page 22.)
SPI wake-up is not possible.
Sleep Mode is not possible. Current from
pull-up will flow through the MCU to the VDD
that has been switched off. The negative edge
of
SPI wake-up is not possible.
SGn
may damage the IC.
CS
Analog Integrated Circuit Device Data
= I
MCU Interface
will put 33975 in Normal Mode.
SGn
x 750Ω + V
Comments
Freescale Semiconductor
Description, page 15).
DS
Table 21
Sleep
the CS