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参数资料
| 型号： | KIT33972AEWEVBE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 8/32页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MC33972 |
| 标准包装： | 1 |
| 主要目的： | 接口，开关探测 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MC33972 |
| 主要属性： | 8 可编程输入（电池开关或接地开关） |
| 次要属性： | 14 开关至接地输入 |
| 已供物品： | 板，CD |
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Analog Integrated Circuit Device Data
16
Freescale Semiconductor
33972
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 (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 (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 (16 mA,
2.0 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 2.0 mA, and 1,0 selects 16 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 (Table 11). The analog
command does not allow pull-down currents on the SPn
inputs. Setting the current to 16 or 2.0 mA may be useful for
reading sensor inputs. Further information is provided in the
Typical Applications section of this datasheet beginning on
page 21. The MCU may change or update the analog select
register via software at any time in Normal mode.
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
16 mA 2.0 mA
0
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