參數(shù)資料
型號(hào)： MC33972
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Multiple Switch Detection Interface with Suppressed Wake-Up(帶抑制喚醒功能的多開關(guān)檢測(cè)接口)
中文描述： 多交換檢測(cè)接口，具有抑制喚醒（帶抑制喚醒功能的多開關(guān)檢測(cè)接口）
文件頁(yè)數(shù)： 15/28頁(yè)
文件大?。?/td> 819K
代理商： MC33972
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33972/D
15
Analog Select Register
The analog voltage on switch inputs may be read by the
MCU using the
analog command
(refer to
Table 6
). 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 V
DD
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 (refer to
Table 6
). The
analog command
does not allow pull-down currents on the SPn
inputs. Setting the current to 16 mA or 2.0 mA may be useful for
reading sensor inputs. Further information is provided in the
Applications
section of this datasheet beginning on page 20.
The MCU may change or update the Analog Select Register via
software at any time in Normal mode.
Table 6. 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
16 mA 2.0mA
0
0
0
0
0
Table 7. 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
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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