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參數(shù)資料
| 型號(hào)： | MC33972DWB |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 其它接口 |
| 英文描述： | Multiple Switch Detection Interface with Suppressed Wake-Up |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PDSO32 |
| 封裝： | PLASTIC, SOIC-32 |
| 文件頁(yè)數(shù)： | 13/28頁(yè) |
| 文件大?。?/td> | 506K |
| 代理商： | MC33972DWB |
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33972
13
Wake-Up/Interrupt Register
The
Wake-Up/Interrupt Register defines the inputs that are
allowed to wake the 33972 from Sleep mode or set the
INT
terminal LOW in Normal mode. Programming the wake-up/
interrupt bit to logic [0] will disable the specific input from
generating an interrupt and will disable the specific input from
waking the IC in Sleep mode (
Table 2
). Programming the wake-
up/interrupt bit to logic [1] will enable the specific input to
generate an interrupt with switch change of state and will enable
the specific input as wake-up. The
MCU may change or update
the Wake-Up/Interrupt Register via software at any time in
Normal mode.
Wetting Current Register
The 33972 has two levels of switch contact current, 16 mA
and 2.0 mA (see
Figure 8
). The
metallic command
is used to set
the switch contact current level (
Table 3
). Programming the
metallic bit to logic [0] will set the switch wetting current to
2.0 mA. Programming the metallic bit to logic [1] will set the
switch contact wetting current to 16 mA. The
MCU may change
or update the Wetting Current Register via software at any time
in Normal mode.
Wetting current is designed to provide higher levels of current
during switch closure. The higher level of current is designed to
keep switch contacts from building up oxides that form on the
switch contact surface.
Figure 8. Contact Wetting and Sustain Current
Table 2. Wake-Up/Interrupt Command
Wake-Up/Interrupt Command
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
0
0
0
0
0
0
1
0
X
X
X
X
X
X
X
X
sp7
sp6
sp5
sp4
sp3
sp2
sp1
sp0
0
0
0
0
0
0
1
1
X
X
sg13 sg12 sg11 sg10
sg9
sg8
sg7
sg6
sg5
sg4
sg3
sg2
sg1
sg0
Switch Contact Voltage
16 mA Switch Wetting Current
2.0 mA Switch Sustain Current
20 ms Wetting Current Timer
Table 3. Metallic Command
Metallic Command
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
0
0
0
0
0
1
0
0
X
X
X
X
X
X
X
X
sp7
sp6
sp5
sp4
sp3
sp2
sp1
sp0
0
0
0
0
0
1
0
1
X
X
sg13 sg12 sg11 sg10
sg9
sg8
sg7
sg6
sg5
sg4
sg3
sg2
sg1
sg0
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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