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33972 Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc

Part # 33972
Description  Multiple Switch Detection Interface with Suppressed Wake-up
PDF  32 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33972 Datasheet(HTML) 17 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
17
33972
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 (Table 13). After the 33972 device receives the
calibration command, the device expects 512
μs logic [0]
calibration pulse on the CS pin. The pulse is used to calibrate
the internal clock. No other SPI pins 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.
Table 12. Analog Channel
Bits 43210
Analog Channel Select
00000
No Input Selected
00001
SG0
00010
SG1
00011
SG2
00100
SG3
00101
SG4
00110
SG5
00111
SG6
01000
SG7
01001
SG8
01010
SG9
01011
SG10
01100
SG11
01101
SG12
01110
SG13
01111
SP0
10000
SP1
10001
SP2
10010
SP3
10011
SP4
10100
SP5
10101
SP6
10110
SP7
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



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