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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)： | 19/32頁 |
| 文件大?。?/td> | 641K |
| 代理商： | PC33975AR2 |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
19
33975
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
EXAMPLE OF NORMAL MODE OPERATION
The operation of the device in Normal Mode is defined by
the states of the programmable internal control registers. A
typical application may have the following settings:
Programmable Switch – Set to Switch-to-Ground
All Inputs Set as Wake-Up
Wetting Current On (32 mA)
Wetting Current Timer On (20 ms)
All inputs Tri-State-Disabled (comparator is active)
Analog select 00000 (no input channel selected)
With the device programmed as above, an interrupt will be
generated with each switch contact change of state (open-to-
close or close-to-open) and 32 mA of contact wetting current
will be source for 20 ms. The
INT
terminal will remain low until
switch status is acknowledged by the microprocessor. It is
Analog Command
0
0
0
0
0
1
1
0
X
X
X
X
X
X
X
X
X
32mA
0
4.0m
A
0
0
0
0
0
0
Wetting Current Timer
Enable Command
Timer ON = 1
Timer OFF = 0
(Default state = 1)
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
SG13 SG12 SG11 SG10 SG9
SG8
SG7
SG6
SG5
SG4
SG3
SG2
SG1
SG0
Tri-State Command
Input Tri-State=1
Input Active = 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
SG13 SG12 SG11 SG10 SG9
SG8
SG7
SG6
SG5
SG4
SG3
SG2
SG1
SG0
Calibration Command
(Default state -
uncalibrated)
0
0
0
0
1
0
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Sleep Command
(See
Sleep
Mode on page
20
)
0
0
0
0
1
1
0
0
X
X
X
X
X
X
X
X
X
X
int
timer
int
timer
int
timer
scan
timer
scan
timer
scan
timer
Reset Command
0
1
1
1
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
SO Response Will
Always Send
therm
flg
RST
flg
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0 SG13 SG12 SG11 SG10 SG9
SG8
SG7
SG6
SG5
SG4
SG3
SG2
SG1
SG0
MSB
Command Bits
Setting Bits
LSB
I
Table 16. Serial Output (SO) Bit Data
Type of Input
Input
Programmed
Voltage on
Input terminal
SO SPI Bit
SP
Switch to Ground
SPn < 4.0 V
1
Switch to Ground
SPn > 4.0 V
0
Switch to Battery
SPn < 4.0 V
0
Switch to Battery
SPn > 4.0 V
1
SG
N/A
SGn < 4.0 V
1
N/A
SGn > 4.0 V
0
Table 17. Serial Output (SO) Response Register
SO Response Will
Always Send
therm
flg
RST
flg
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0 SG13 SG12 SG11 SG10 SG9
SG8
SG7
SG6
SG5
SG4
SG3
SG2
SG1
SG0
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