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參數(shù)資料
| 型號： | MC33972ATEW |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 13/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH DETECT SPI 32-SOIC |
| 標(biāo)準(zhǔn)包裝： | 42 |
| 應(yīng)用： | 開關(guān)監(jiān)控 |
| 接口： | SPI 串行 |
| 電源電壓： | 3.1 V ~ 5.25 V |
| 封裝/外殼： | 32-BSSOP 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-SOIC |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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Analog Integrated Circuit Device Data
20
Freescale Semiconductor
33972
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
The scan timer sets the polling period between input
switch reads in Sleep mode. The period is set in the sleep
command and may be set to 000 (no period) to 111 (64 ms).
In Sleep mode when the scan timer expires, inputs will
behave as programmed prior to sleep command. The 33972
will wake up for approximately 125
μs and read the switch
inputs. At the end of the 125
μs, the input switch states are
compared with the switch state prior to sleep command.
When switch state changes are detected, an interrupt is
generated (when enabled; refer to wake-up/interrupt
command description on page 15), and the device enters
Normal mode. Without switch state changes, the 33972 will
reset the scan timer, inputs become tri-state, and the Sleep
mode continues until the scan timer expires again.
Table 20 shows the programmable settings of the Scan
timer.
Note The interrupt and scan timers are disabled in the
Normal Mode.
Figure 5, page 9, is a graphical description of how the
33972 device exits Sleep mode and enters Normal mode.
Notice that the device will exit Sleep mode when the interrupt
timer expires or when a switch change of state occurs. The
falling edge of INT triggers the MCU to wake from Sleep
state. Figure 12 illustrates the current consumed during
Sleep mode. During the 125
μs, the device is fully active and
switch states are read. The quiescent current is calculated by
integrating the normal running current over scan period plus
approximately 60
μA.
Figure 12. Sleep Current Waveform
TEMPERATURE MONITOR
With multiple switch inputs closed and the device
programmed with the wetting current timers disabled,
considerable power will be dissipated by the IC. For this
reason, temperature monitoring has been implemented. The
temperature monitor is active in the Normal mode only. When
the IC temperature is above the thermal limit, the temperature
monitor will do all of the following:
Generate an interrupt.
Force all 16 mA pull-up and pull-down current sources
to revert to 2.0 mA current sources.
Maintain the 2.0 mA current source and all other
functionality.
Set the thermal flag bit in the SPI output register.
The thermal flag bit in the SPI word will be cleared on rising
edge of CS provided the die temperature has cooled below
the thermal limit. When die temperature has cooled below
thermal limit, the device will resume previously programmed
settings.
Table 19. 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
Table 20. Scan Timer
Bits 210
Scan Period
000
No Scan
001
1.0 ms
010
2.0 ms
011
4.0 ms
100
8.0 ms
101
16 ms
110
32 ms
111
64 ms
Inputs active for 125 us
out of 32 ms
I=V/R or 0.270V/100ohm = 2.7mA
I=V/R or 6mV/100ohm = 60 uA
Inputs active for 125 us
out of 32 ms
I=V/R or 0.270V/100ohm = 2.7mA
I=V/R or 6mV/100ohm = 60 uA
Inputs active for 125 us
out of 32 ms
I=V/R or 0.270V/100ohm = 2.7mA
I=V/R or 6mV/100ohm = 60 uA
I = V/R or 0.270V/100
Ω = 2.7mA
Inputs active for
125
μs out of 32ms
I = V/R or
6.0mV/100
Ω = 60μA
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| 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(fēng)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(biāo)準(zhǔn)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 |
| MC33972DWBR2 | 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(biāo)準(zhǔn)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 |
| MC33972EW | 功能描述:多路器開關(guān) IC MSDISW RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MC33972EWR2 | 功能描述:多路器開關(guān) IC MSDISW RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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