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33975 Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc

Part # 33975
Description  Multiple Switch Detection Interface with Suppressed Wake-Up and 32mA Wetting Current
PDF  32 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33975 Datasheet(HTML) 18 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
18
Freescale Semiconductor
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 µs
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 µs calibration pulse.
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
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
Table 13. Calibration Command
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
Table 14. Reset Command
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
LSBI
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
000000
0
0
XXXXXX
XXXXX
XXXXX
Settings Command
Bat=1, Gnd=0
(Default state =
1)
000000
0
1
XXXXXX
XX
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
Wake-Up/Interrupt Bit
Wake-Up=1
Nonwake-Up=0
(Default state = 1)
000000
1
0
XXXXXX
XX
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
000000
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)
000001
0
0
XXXXXX
XX
SP7
SP6
SP5
SP4
SP3
SP2
SP1
SP0
000001
0
1
X
X
SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0



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