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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)： | 23/28頁 |
| 文件大小： | 506K |
| 代理商： | MC33972EW |
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33972
23
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 11). 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 from first device is
connected to SI of second device). With two devices, 48 clock
pulses are required to shift data in. When the
WAKE
feature is
used to enable the power supply, both
WAKE
terminals should
be connected to the enable terminal on the power supply. The
INT
terminals may be connected to one interrupt terminal on the
MCU or may have their own dedicated interrupt to the MCU.
The transition from Normal to Sleep mode is done by
sending the
sleep command
. With the devices connected in
serial and the
sleep command
sent, both will enter Sleep mode
on the rising edge of
CS
. When Sleep mode is entered, the
WAKE
terminal will be logic [1]. If either device wakes up, the
WAKE
terminal will transition LOW, waking the other device.
A condition exists where the MCU is sending the
sleep
command
(
CS
logic [0]) and a switch input changes state. With
this event the device that detects this input will not transition to
Sleep mode, while the second device will enter Sleep mode. In
this case two
switch status commands
must be sent to receive
accurate switch status data. The first
switch status command
will wake the device in Sleep mode. Switch status data may not
be valid from the first
switch status command
because of the
time required for the input voltage to rise above the 4.0 V input
comparator threshold. This time is dependant on the
impedance of SGn or SPn node. The second
switch status
command
will provide accurate switch status information. It is
recommended that software wait 10 ms to 20 ms between the
two
switch status commands,
allowing time for switch input
voltages to stabilize. With all switch states acknowledged by the
MCU, the sleep sequence may be initiated. All parameters for
Sleep mode should be updated prior to sending the
sleep
command
.
The 33972 IC has an internal 5.0 V supply from V
PWR
terminal. A POR circuit monitors the internal 5.0 V supply. In the
event of transients on the V
PWR
terminal, an internal reset may
occur. Upon reset the 33972 will enter Normal mode with the
internal registers as defined in
Table 10
, page 17. Therefore it
is recommended that the MCU periodically update all registers
internal to the IC.
Using the
WAKE
Feature
The 33972 provides a
WAKE
output and wake-up input
designed to control an enable terminal on system power supply.
While in the Normal mode, the
WAKE
output is LOW, enabling
the power supply. In the Sleep mode, the
WAKE
terminal is
HIGH, disabling the power supply. The
WAKE
terminal has a
passive pullup to the internal 5.0 V supply but may be pulled up
through a resistor to V
PWR
supply (see Figure 14, page 24)
When the WAKE output is not used the terminal should be
pulled up to the V
DD
supply through a resistor as shown in
Figure 13, page 24.
During the Sleep mode, a switch closure will set the
WAKE
terminal LOW, causing the 33972 to enter the Normal mode.
The power supply will then be activated, supplying power to the
V
DD
terminal and the microprocessor and the 33972. The
microprocessor can determine the source of the wake-up by
reading the interrupt flag.
Cost and Flexibility
Systems requiring a significant number of switch interfaces
have many discrete components. Discrete components on
standard PWB consume board space and must be checked for
solder joint integrity. An integrated approach reduces solder
joints, consumes less board space, and offers wider operating
voltage, analog interface capability, and greater interfacing
flexibility.
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) |
參數(shù)描述 |
|---|---|
| MC33972EWR2 | 功能描述:多路器開關 IC MSDISW RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MC33972TEW | 功能描述:接口 - 專用 MULTI-SW DETECT W/SUPRES RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| MC33972TEWR2 | 功能描述:接口 - 專用 MULTI-SW DETECT W/SUPRES RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| MC33975ATEK | 功能描述:接口 - 專用 ENHANCED MULTI SW DETECT RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| MC33975ATEKR2 | 功能描述:接口 - 專用 ENHANCED MULTI SW DETECT RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
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