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參數(shù)資料
| 型號： | MCZ33993EW |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Multiple Switch Detection Interface |
| 中文描述： | 多交換檢測接口 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 504K |
| 代理商： | MCZ33993EW |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
14
33993
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
WETTING CURRENT TIMER REGISTER
Each switch input has a designated 20 ms timer. The timer
starts when the specific switch input crosses the comparator
threshold (4.0 V). When the 20 ms timer expires, the contact
current is reduced from 16 mA to 2.0 mA. The wetting current
timer may be disabled for a specific input. When the timer is
disabled, 16 mA of current will continue to flow through the
closed switch contact. With multiple wetting current timers
disabled, power dissipation for the IC must be considered.
The MCU may change or update the Wetting Current
Timer Register
via software at any time in Normal mode. This
allows the MCU to control the amount of time wetting current
is applied to the switch contact. Programming the wetting
current timer bit to logic [0] will disable the wetting current
timer. Programming the wetting current timer bit to logic [1]
will enable the wetting current timer (refer to
Table 8
).
TRI-STATE REGISTER
The
tri-state command
is use to set the SPn or SGn input
node as high impedance (refer to
Table 9
). 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 10
). 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 10
). 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
Typical Applications
section of this datasheet
beginning on page
20
. The MCU may change or update the
Table 7. 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
sg1
3
sg1
2
sg1
1
sg1
0
sg9
sg8
sg7
sg6
sg5
sg4
sg3
sg2
sg1
sg0
Table 8. 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
0
0
0
0
0
1
1
1
X
X
X
X
X
X
X
X
sp7
sp6
sp5
sp4
sp3
sp2
sp1
sp0
0
0
0
0
1
0
0
0
X
X
sg1
3
sg1
2
sg1
1
sg1
0
sg9
sg8
sg7
sg6
sg5
sg4
sg3
sg2
sg1
sg0
Table 9. 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
0
0
0
0
1
0
0
1
X
X
X
X
X
X
X
X
sp7
sp6
sp5
sp4
sp3
sp2
sp1
sp0
0
0
0
0
1
0
1
0
X
X
sg1
3
sg1
2
sg1
1
sg1
0
sg9
sg8
sg7
sg6
sg5
sg4
sg3
sg2
sg1
sg0
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