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參數(shù)資料
| 型號(hào)： | 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)： | 18/28頁 |
| 文件大?。?/td> | 504K |
| 代理商： | MCZ33993EW |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
18
33993
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
The scan timer sets the polling period between input
switch reads in Sleep mode. The period is set in the
sleep
command
and may be set to 000 (no period) to 111 (64 ms).
In Sleep mode when the scan timer expires, inputs will
behave as programmed prior to sleep command. The 33993
will wake up for approximately 125
μ
s and read the switch
inputs. At the end of the 125
μ
s,
the input switch states are
compared with the switch state prior to sleep command.
When switch state changes are detected, an interrupt (when
enabled; refer to
wake
-
up / nterrupt command
description on
page
13
) is generated and the device enters Normal mode.
Without switch state changes, the 33993 will reset the scan
timer, inputs become tri-state, and the Sleep mode continues
until the scan timer expires again.
Table 19
shows the programmable settings of the Scan
timer.
Note
The interrupt and scan timers are disabled in the
Normal mode.
Figure 5
, page
8
, is a graphical description of how the
33993 device exits Sleep mode and enters Normal mode.
Notice that the device will exit Sleep mode when the interrupt
timer expires or when a switch change of state occurs. The
falling edge of INT triggers the MCU to wake from Sleep
state.
Figure 11
illustrates the current consumed during
Sleep mode. During the 125
μ
s, the device is fully active and
switch states are read. The quiescent current is calculated by
integrating the normal running current over scan period plus
approximately 60
μ
A.
Figure 11. Sleep Current Waveform
TEMPERATURE MONITOR
With multiple switch inputs closed and the device
programmed with the wetting current timers disabled,
considerable power will be dissipated by the IC. For this
reason temperature monitoring has been implemented. The
temperature monitor is active in the Normal mode only. When
the IC temperature is above the thermal limit, the temperature
monitor will do all of the following:
Table 17. Sleep Command
Sleep 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
1
0
0
X
X
X
X
X
X
X
X
X
X
i
i
i
s
s
s
Table 18. Interrupt Timer
Bits 543
Interrupt Period
000
32 ms
001
64 ms
010
128 ms
011
256 ms
100
512 ms
101
1.024 s
110
2.048 s
111
4.096 s
Table 19. Scan Timer
Bits 210
Scan Period
000
No Scan
001
1.0 ms
010
2.0 ms
011
4.0 ms
100
8.0 ms
101
16 ms
110
32 ms
111
64 ms
Table 19. Scan Timer
Bits 210
Scan Period
out of 32 ms
I=V/R or 0.270 V/100
=2.7 mA
I=V/R or
6.0 mV/100
=60
μ
A
Inputs active for 125 us
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