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参数资料
| 型号： | MCZ33972EWR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 7/32页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH DETECTION MULT 32-SOIC |
| 标准包装： | 1,000 |
| 应用： | 开关监控 |
| 接口： | SPI |
| 电源电压： | 8 V ~ 26 V |
| 封装/外壳： | 32-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 32-SOIC |
| 包装： | 带卷 (TR) |
| 安装类型： | 表面贴装 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
15
33972
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
WETTING CURRENT REGISTER
The 33972 has two levels of switch contact current, 16 and
2.0 mA (see Figure 11). The metallic command is used to set
the switch contact current level (Table 8). Programming the
metallic bit to logic [0] will set the switch wetting current to
2.0 mA. Programming the metallic bit to logic [1] will set the
switch contact wetting current to 16 mA. The MCU may
change or update the wetting current register via software at
any time in Normal mode.
Wetting current is designed to provide higher levels of
current during switch closure. The higher level of current is
designed to keep switch contacts from building up oxides that
form on the switch contact surface.
Figure 11. Contact Wetting and Sustain Current
WETTING CURRENT TIMER REGISTER
Each switch input has a designated 20 ms timer. The timer
starts when the specific switch input crosses the comparator
threshold (4.0 V). When the 20 ms timer expires, the contact
current is reduced from 16 to 2.0 mA. The wetting current
timer may be disabled for a specific input. When the timer is
disabled, 16 mA of current will continue to flow through the
closed switch contact. With multiple wetting current timers
disabled, power dissipation for the IC must be considered.
The MCU may change or update the wetting current timer
register via software at any time in Normal mode. This allows
the MCU to control the amount of time wetting current is
applied to the switch contact. Programming the wetting
current timer bit to logic [0] will disable the wetting current
timer. Programming the wetting current timer bit to logic [1]
will enable the wetting current timer (Table 9).
Table 7. Wake-up /Interrupt Command
Wake-up/Interrupt 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
1
0
X
sp7 sp6 sp5 sp4 sp3 sp2 sp1 sp0
0
1
X
sg13 sg12 sg11 sg10 sg9 sg8 sg7 sg6 sg5 sg4 sg3 sg2 sg1 sg0
Switch Contact Voltage
16 mA Switch Wetting Current
2.0 mA Switch Sustain Current
20 ms Wetting Current Timer
Table 8. Metallic Command
Metallic 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
1
0
X
sp7 sp6 sp5 sp4 sp3 sp2 sp1 sp0
0
1
0
1
X
sg13 sg12 sg11 sg10 sg9 sg8 sg7 sg6 sg5 sg4 sg3 sg2 sg1 sg0
Table 9. Wetting Current Timer Enable Command
Wetting Current Timer Commands
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
1
X
sp7 sp6 sp5 sp4 sp3 sp2 sp1 sp0
0
1
0
X
sg13 sg12 sg11 sg10 sg9 sg8 sg7 sg6 sg5 sg4 sg3 sg2 sg1 sg0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCZ33972TEW | 制造商:Freescale Semiconductor 功能描述:MULTI-SW DETECT W/SUPRES - Bulk |
| MCZ33972TEW/R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Multiple Switch Detection Interface with Suppressed Wake-up |
| MCZ33972TEWR2 | 制造商:Freescale Semiconductor 功能描述:MULTI-SW DETECT W/SUPRES - Tape and Reel |
| MCZ33975AEK | 功能描述:输入/输出控制器接口集成电路 ENHANCED MULTI SW DETECT RoHS:否 制造商:Silicon Labs 产品: 输入/输出端数量: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-64 封装:Tray |
| MCZ33975AEKR2 | 功能描述:接口 - 专用 ENHANCED MULTI SW DETECT RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
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