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| 型号： | MC33884DW |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 7/21页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH SDI MONITOR 24-SOIC |
| 标准包装： | 30 |
| 系列： | * |
| 应用： | * |
| 接口： | * |
| 电源电压： | * |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
33884
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
TRI-STATE COMMAND
This command places an external switch into a Tri-State
condition, essentially disconnecting the wetting current (if the
switch is metallic) and the sustain current. The internal input-
threshold comparator is still internally connected to its
external pin. This command does not change the mode of
operation
CP[4:1] – CONFIGURE PROGRAMMABLE SWITCH
Configure the programmable inputs SP[4:1] to detect
either an external switch-to-ground (internal current source)
or an external switch-to-battery (internal current sink).
Note: This configuration may be entered in any of the three
valid Operating Modes (see MOD[2:1]) within the Run
command.
(e.g., a Tri-State command received while in the Polling
mode leaves the part in that mode).
Note: The Tri-State register clears all bits to logic [0] (all
inputs in Tri-State) in response to a hardware reset; all inputs
also remain in Tri-State after existing the Sleep mode.
METALLIC COMMAND
This command enables the pulsed wetting current for an
external metallic switch and disables it for an external non-
metallic switch. This command does not change the mode of
operation (e.g., a Metallic command received while in Polling
mode leaves the part in that mode). Note that the Run
register values are unknown after exiting the Sleep mode.
Table 11. Programmable Switch Bit Definition
CPx
External Switch to:
0
Ground
1
Battery
Table 12. Tri-State Command
MSB
LSB
Command
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Tri-State
0
1
TG6
TG5
TG4
TG3
TG2
TG1
TP4
TP3
TP2
TP1
TB2
TB1
Reset Values:
Run Register
—
0
TG[6:1] = Tri-state switch-to-ground
TB[2:1] = Tri-state switch-to-battery
TP[4:1] = Tri-state programmable switch
Table 13. Programmable Switch Bit Definition
TGx, TBx, TPx
Input Configured to:
0
Input Disabled (Default)
1
Input Enabled
Table 14. Metallic Command
MSB
LSB
Command
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Metallic
0
1
0
1
MG6
MG5
MG4
MG3
MG2
MG1
MP4
MP3
MP2
MP1
MB2
MB1
Reset Values:
Run Register
—
U
U = Unknown value coming out of Sleep mode. It must be configured with Run command.
MG[6:1] = Metallic switch-to-ground
MB[2:1] = Metallic switch-to-battery
MP[4:1] = Metallic programmable switch
Table 15. Metallic Switch Bit Definition
MGx, MBx, MPx
Accept Switch Type:
0
Non-Metallic
1
Metallic (Enable Wetting Current Pulse)
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