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參數(shù)資料
| 型號： | PC33975AEK |
| 廠商： | 飛思卡爾半導(dǎo)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)： | 18/32頁 |
| 文件大?。?/td> | 641K |
| 代理商： | PC33975AEK |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
18
33975
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
CALIBRATION OF TIMERS
In cases where an accurate time base is required, the user
may calibrate the internal timers using the
calibration
command
(refer to
Table 13
)
.
After the 33975 device
receives the calibration command, the device expects 512
μ
s
logic [0] calibration pulse on the
CS
terminal. The pulse is
used to calibrate the internal clock. No other SPI terminals
should transition during this 512
μ
s calibration pulse.
Table 13. Calibration Command
Because the oscillator frequency changes with temperature,
calibration is required for an accurate time base. Calibrating
the timers has no affect on the quiescent current
measurement. The calibration command simply makes the
time base more accurate. The
calibration command
may be
used to update the device on a periodic basis. All reset
conditions clear the calibration register and places the device
in the uncalibrated state.
RESET
The reset command resets all registers to Power-ON
Reset (POR) state. Refer to
Table 15
, page
18
, for POR
Table 14. Reset Command
states or the paragraph entitled
Power-ON Reset (POR)
on
page
14
of this datasheet.
SPI COMMAND SUMMARY
Table 15
below provides a comprehensive list of SPI
commands recognized by the 33975 and the reset state of
each register.
Table 16
and
Table 17
contain the Serial
Output (SO) data for input voltages greater or less than the
threshold level. Open switches are always indicated with a
logic [0], closed switches are indicated with logic [1].
Table 15. SPI Command Summary
Calibration 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
1
0
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Reset 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
1
1
1
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
MSB
Command Bits
Setting Bits
LSB
I
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Switch Status
Command
0
0
0
0
0
0
0
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Settings Command
Bat=1, Gnd=0
(Default state =
1)
0
0
0
0
0
0
0
1
X
X
X
X
X
X
X
X
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
Wake-Up/Interrupt Bit
Wake-Up=1
Nonwake-Up=0
(Default state = 1)
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
Metallic Command
Metallic = 1
Non-metallic = 0
(Default state =
1)
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
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