參數(shù)資料
型號(hào)： MC33993
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Multiple Switch Detection Interface(多開(kāi)關(guān)監(jiān)測(cè)接口)
中文描述： 多交換檢測(cè)接口（多開(kāi)關(guān)監(jiān)測(cè)接口）
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 820K
代理商： MC33993
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33993/D
19
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/interrupt 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 15
shows the programmable settings of the Scan
timer.
Note
The interrupt and scan timers are disabled in the
Normal mode.
Figure 3
, 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 9
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 9. 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:
Generate an interrupt.
Force all 16 mA pull-up and pull-down current sources to
revert to 2.0 mA current sources.
Maintain the 2.0 mA current source and all other
functionality.
Set the thermal flag bit in the SPI output register.
The thermal flag bit in the SPI word will be cleared on rising
edge of
CS
provided the die temperature has cooled below the
thermal limit. When die temperature has cooled below thermal
limit, the device will resume previously programmed settings.
Table 15. 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
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
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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