INTRODUCTION Figure 15. MOSFET or LED Driver Output" />
參數(shù)資料
型號(hào)： KIT33972AEWEVBE
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 16/32頁(yè)
文件大?。?/td> 0K
描述： KIT EVALUATION FOR MC33972
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，開(kāi)關(guān)探測(cè)
嵌入式： 否
已用 IC / 零件： MC33972
主要屬性： 8 可編程輸入（電池開(kāi)關(guān)或接地開(kāi)關(guān)）
次要屬性： 14 開(kāi)關(guān)至接地輸入
已供物品： 板，CD
Analog Integrated Circuit Device Data
Freescale Semiconductor
23
33972
TYPICAL APPLICATIONS
INTRODUCTION
Figure 15. 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 9, page 15).
metallic command –Set SPn to 16 or 2.0 mA gate drive
current (refer to Table 8, page 15).
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
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 pin 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
Ω resistor, the analog voltage on the SGn
pin will be approximately:
As the voltage on the drain of the MOSFET increases, so
does the voltage on the SGn pin. With the SGn pin 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 VPWR may damage the IC.
The SP0:SP7 pins 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 21
shows several system configurations for power between the
MCU and the 33972 and their specific requirements for
functionality.
Multiple 33972 devices may be used in a module system.
SPI control may be done in parallel or serial. However when
parallel mode is used, each device is addressed
independently (refer to MCU Interface Description, page 13).
Therefore when sending the sleep command, one device will
enter sleep before the other. For multiple devices in a system,
it is recommended that the devices are controlled in serial (S0
SP0
SG0
SG13
16
2.0
4.0V Ref
+
-
Comparator
To SPI
VPWR
SG0
1.5k
Ω
LO
A
D
VBAT
AMUX
100k
Ω
mA
VPWR
+
-
Comparator
To SPI
4.0V
Ref
2.0
2.0mA
16
mA
16
mA
VPWR
SG0
16
2.0
VPWR
mA
VPWR
+
Comparator
To SPI
4.0V Ref
SG13
-
mA
Table 21. Sleep Mode Power Supply
MCU
VDD
33972
VDD
Comments
5.0 V
All wake-up conditions apply. (Refer to Sleep
5.0 V
0 V
SPI wake-up is not possible.
0 V
5.0 V
Sleep mode not possible. Current from CS pull-
up will flow through MCU to VDD that has been
switched off. Negative edge of CS will put
33972 in Normal mode.
0 V
SPI wake-up is not possible.
VSGn = ISGn x 1.5kΩ + VDS
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