參數(shù)資料
型號： MC33972EW
廠商： Motorola, Inc.
英文描述： Multiple Switch Detection Interface with Suppressed Wake-Up
中文描述： 多交換檢測接口，具有抑制喚醒
文件頁數(shù)： 22/28頁
文件大小： 506K
代理商： MC33972EW
33972
22
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Figure 12. MOSFET or LED Driver Output
The sequence of commands (from Normal mode with inputs
tri-state) required to set up the device to drive a MOSFET are
as follows:
wetting current timer enable command
–Disable SPn
wetting current timer (refer to
Table 4
, page 14).
metallic command
–Set SPn to 16 mA or 2.0 mA gate
drive current (refer to
Table 3
, page 13).
settings command
–Set SPn as switch-to-battery (refer to
Table 1
, page 12).
tri-state command
–Disable tri-state for SPn (refer to
Table 5
, page 14).
After the
tri-state command
has been sent (tri-state 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
:
settings command
–SPn as switch-to-ground (MOSFET
ON).
settings command
–SPn as switch-to-battery (MOSFET
OFF).
Monitoring of the MOSFET drain in the OFF state provides
open load detection. This is done by using an SGn input
comparator. With the SGn input in tri-state, the load will pull up
the SGn input to battery. With open load the SGn terminal is
pulled down to ground through an external resistor. The open
load is indicated by a logic [1] in the SO data bit.
The
analog command
may be used to monitor the drain
voltage in the MOSFET ON state. By sourcing 2.0 mA of current
to the 1.5 k
resistor, the analog voltage on the SGn terminal
will be approximately:
As the voltage on the drain of the MOSFET increases, so
does the voltage on the SGn terminal. With the SGn terminal
selected as analog, the MCU may perform the A/D conversion.
Using this method for controlling unclamped inductive loads
is not recommended. Inductive flyback voltages greater than
V
PWR
may damage the IC.
The SP0:SP7 terminals of this device may also be used to
send signals from one module to another. Operation is similar
to the gate control of a MOSFET.
For LED applications a resistor in series with the LED is
recommended but not required. The switch-to-ground inputs
are recommended for LED application. To drive the LED use
the following commands:
wetting current timer enable command
–Disable SGn
wetting current timer.
metallic command
–Set SGn to 16 mA.
From this point forward the LED may be turned on and off using
the
tri-state command
:
tri-state command
–Disable tri-state for SGn (LED ON).
tri-state command
–Enable tri-state for SGn (LED OFF).
These parameters are easily programmed via SPI commands
in Normal mode.
Multiple 33972 Devices in a Module System
Connecting power to the 33972 and the MCU for Sleep mode
operation may be done in several ways.
Table 16
shows
several system configurations for power between the MCU and
the 33972 and their specific requirements for functionality.
SP0
SG0
SG13
16
mA
2.0
mA
4.0 V Ref
+
-
Comparator
To SPI
V
PWR
SG0
1.5 k
L
VBAT
AMUX
100 k
V
PWR
+
-
Comparator
2.0 mA
To SPI
4.0 V
Ref
2.0
mA
16
mA
16
mA
V
PWR
V
PWR
SG0
16
mA
2.0
mA
V
PWR
V
PWR
+
-
Comparator
To SPI
4.0 V Ref
SG13
Table 16. Sleep Mode Power Supply
MCU
V
DD
33972
V
DD
Comments
5.0 V
5.0 V
All wake-up conditions apply. (Refer to
Sleep
Mode
, page 18.)
5.0 V
0 V
SPI wake-up is not possible.
0 V
5.0 V
Sleep mode not possible. Current from
CS
pullup will flow through MCU to V
DD
that has
been switched off. Negative edge of
CS
will put
33972 in Normal mode.
0 V
0 V
SPI wake-up is not possible.
V
SGn
= I
SGn
x 1.5 k
+ V
DS
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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相關代理商/技術參數(shù)
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