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參數(shù)資料
| 型號： | PC33975AR2 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | Multiple Switch Detection Interface with Suppressed Wake-Up and 32mA Wetting Current |
| 中文描述： | 多交換檢測接口，具有抑制喚醒和32毫安濕電流 |
| 文件頁數(shù)： | 17/32頁 |
| 文件大?。?/td> | 641K |
| 代理商： | PC33975AR2 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
17
33975
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
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 terminal is buffered and made available
on the AMUX output terminal. The AMUX output terminal is
clamped to a maximum of VDD volts regardless of the higher
voltages present on the input terminal. 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 mA 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
22
. The MCU may change or update the
Analog Select Register via software at any time in Normal
mode.
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
0
0
0
0
0
1
1
0
X
X
X
X
X
X
X
X
X
32
mA
4.0
mA
0
0
0
0
0
Table 12. Analog Channel
Bits 43210
Analog Channel Select
00000
No Input Selected
00001
SG0
00010
SG1
00011
SG2
00100
SG3
00101
SG4
00110
SG5
00111
SG6
01000
SG7
01001
SG8
01010
SG9
01011
SG10
01100
SG11
01101
SG12
01110
SG13
01111
SP0
10000
SP1
10001
SP2
10010
SP3
10011
SP4
10100
SP5
10101
SP6
10110
SP7
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