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參數資料
| 型號： | MCZ33975AEKR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數： | 10/32頁 |
| 文件大小： | 0K |
| 描述： | IC SWITCH DETECT MULT ENH 32SOIC |
| 標準包裝： | 1,000 |
| 應用： | 自動 |
| 接口： | SPI |
| 電源電壓： | 5.5 V ~ 28 V |
| 封裝/外殼： | 32-BSOP（0.295"，7.50mm 寬）裸露焊盤 |
| 供應商設備封裝： | 32-SOICW 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
| 安裝類型： | 表面貼裝 |
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Analog Integrated Circuit Device Data
18
Freescale Semiconductor
33975
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
TRI-STATE REGISTER
The tri-state command is use to set the SPn or SGn input
node as high-impedance (refer to Table 10). By setting the
Tri-state Register bit to logic [1], the input will be high-
impedance regardless of the metallic command setting. The
comparator on each input remains active. This command
allows the use of each input as a comparator with a 4.0 V
threshold. The MCU may change or update the Tri-state
Register via software at any time in Normal mode.
ANALOG SELECT REGISTER
The analog voltage on switch inputs may be read by the MCU
using the analog command (refer to Table 11). Internal to the
IC is a 22-to-1 analog multiplexer. The voltage present on the
selected input pin is buffered and made available on the
AMUX output pin. The AMUX output pin is clamped to a
maximum of VDD volts regardless of the higher voltages
present on the input pin. After an input has been selected as
the analog, the corresponding bit in the next SO data stream
will be logic [0]. When selecting a channel to be read as
analog, the user must also set the desired current (32 mA,
4.0 mA, or high-impedance). Setting bit 6 and bit 5 to 0,0
selects the input as high-impedance. Setting bit 6 and bit 5 to
0,1 selects 4.0 mA, and 1,0 selects 32 mA. Setting bit 6 and
bit 5 to 1,1 in the Analog Select Register is not allowed and
will place the input as an analog input with high-impedance.
Analog currents set by the analog command are pull-up
currents for all SGn and SPn inputs (refer to Table 11). The
analog command does not allow pull-down currents on the
SPn inputs. Setting the current to 32 or 4.0 mA may be useful
for reading sensor inputs. Further information is provided in
the Typical Applications section of this datasheet beginning
on page 23. The MCU may change or update the Analog
Select Register via software at any time in Normal mode.
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
sg1
3
sg1
2
sg1
1
sg1
0
sg9 sg8 sg7 sg6 sg5 sg4 sg3 sg2 sg1 sg0
Table 10. Tri-state Command
Tri-State 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
0
1
X
sp7 sp6 sp5 sp4 sp3 sp2 sp1 sp0
0
1
0
1
0
X
sg13 sg12 sg11 sg10 sg9 sg8 sg7 sg6 sg5 sg4 sg3 sg2 sg1 sg0
Table 11. Analog Command
Analog Command
Not used
Current
Select
Analog Channel Select
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
32
mA
4.0
mA
0
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