- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄382305 > MC33972 (Motorola, Inc.) Multiple Switch Detection Interface with Suppressed Wake-Up PDF資料下載
參數(shù)資料
| 型號： | MC33972 |
| 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)： | 18/28頁 |
| 文件大?。?/td> | 506K |
| 代理商： | MC33972 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁當前第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
33972
18
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Example of Normal Mode Operation
The operation of the device in Normal Mode is defined by the
states of the programmable internal control registers. A typical
application may have the following settings:
Programmable Switch – Set to Switch-to-Ground
All Inputs Set as Wake-Up
Wetting Current On (16 mA)
Wetting Current Timer On (20 ms)
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
generated with each switch contact change of state (open-to-
close or close-to-open) and 16 mA of contact wetting current
will be source for 20 ms. The
INT
terminal will remain LOW until
switch status is acknowledged by the microprocessor. It is
critical to understand
INT
will not be cleared on the rising edge
of
CS
if a switch closure occurs while
CS
is LOW. The maximum
duration a switch state change can exist without
acknowledgement depends on the software response time to
the interrupt.
Figure 4
, page 8, shows the interaction between
changing input states and the
INT
and
CS
terminals.
If desired the user may disable interrupts (
wake up/interrupt
command
) from the 33972 device and read the switch states on
a periodic basis. Switch activation and deactivation faster than
the MCU read rate will not be acknowledged.
The 33972 device will exit the Normal mode and enter the
Sleep mode only with a valid sleep command.
Sleep Mode
Sleep mode is used to reduce system quiescent currents.
Sleep mode may be entered only by sending the
sleep
command.
All register settings programmed in Normal mode
will be maintained in Sleep mode.
The 33972 will exit Sleep mode and enter Normal mode
when any of the following events occur:
Input Switch Change of State (when enabled)
Interrupt Timer Expire
Falling Edge of
WAKE
Falling Edge of
INT
(with V
DD
= 5.0 V and
WAKE
at
Logic [1])
Falling Edge of
CS
(with V
DD
= 5.0 V)
Power-ON Reset (POR)
The V
DD
supply may be removed from the device during
Sleep mode. However removing V
DD
from the device in Sleep
mode will disable a wake-up from falling edge of
INT
and
CS
.
Note
In cases where
CS
is used to wake the device, the first
SO data message is not valid.
The sleep command contains settings for two programmable
timers for Sleep mode, the interrupt timer and the scan timer, as
shown in
Table 13
The interrupt timer is used as a periodic
wake-up timer. When the timer expires, an interrupt is
generated and the device enters Normal mode.
Note
The interrupt timer in the 33972 device may be
disabled by programming the interrupt bits to logic [1 1 1].
Table 14
shows the programmable settings of the Interrupt
timer.
Table 13. Sleep Command
Sleep Command
Command Bits
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
1
1
0
0
X
X
X
X
X
X
X
X
X
X
i
i
i
s
s
s
Table 14. Interrupt Timer
Bits 543
Interrupt Period
000
32 ms
001
64 ms
010
128 ms
011
256 ms
100
512 ms
101
1.024 s
110
2.048 s
111
No interrupt wake-up
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC33972DWB | Multiple Switch Detection Interface with Suppressed Wake-Up |
| MC33972EW | Multiple Switch Detection Interface with Suppressed Wake-Up |
| MC33999 | 16-Output Switch with SPI and PWM Control |
| MC34152P | Single Output LDO, 250mA, Fixed(3.3V), Low Noise, Fast Transient Response 8-SOIC -40 to 85 |
| MC33152 | High Speed Dual MOSFET Drivers(高速雙MOSFET驅(qū)動器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC33972ATEK | 功能描述:接口 - 專用 MULT SW DET SUP-WKUP 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 |
| MC33972ATEKR2 | 功能描述:接口 - 專用 MULT SW DET SUP-WKUP 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 |
| MC33972ATEW | 功能描述:接口 - 專用 MULT SW DET SUP-WKUP 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 |
| MC33972ATEWR2 | 功能描述:接口 - 專用 MULT SW DET SUP-WKUP 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 |
| MC33972DWB | 功能描述:IC SWITCH DETECT SPI 32-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標準包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
發(fā)布緊急采購，3分鐘左右您將得到回復。