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參數(shù)資料
| 型號(hào)： | PC33975A |
| 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(cè)接口，具有抑制喚醒和32毫安濕電流 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 641K |
| 代理商： | PC33975A |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
20
33975
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
critical to understand
INT
will not be cleared on the rising
edge of
CS
if a switch closure occurs while
CS
is low. The
maximum duration a switch state change can exist without
acknowledgement depends on the software response time to
the interrupt.
Figure 6
, page
10
, shows the interaction
between changing input states and the
INT
and
CS
terminals.
If desired the user may disable interrupts (
wake up/
interrupt command
) from the 33975 device and read the
switch states on a periodic basis. Switch activation and
deactivation faster than the MCU read rate will not be
acknowledged.
The 33975 device will exit the Normal mode and enter the
Sleep mode only with a valid sleep command.
SLEEP MODE
Sleep mode is used to reduce system quiescent currents.
Sleep mode may be entered only by sending the
sleep
command.
All register settings programmed in Normal mode
will be maintained in Sleep mode.
The 33975 will exit Sleep mode and enter Normal mode
when any of the following events occur:
Input Switch Change of State (when enabled)
Table 18. Sleep Command
Interrupt Timer Expire
Falling Edge of
WAKE
Falling Edge of
INT
(with VDD = 5.0 V and
WAKE
at
Logic [1])
Falling Edge of
CS
(with VDD = 5.0 V)
Power-ON Reset (POR)
The VDD supply may be removed from the device during
Sleep mode. However removing VDD from the device in
Sleep mode will disable a wake-up from falling edge of
INT
and
CS
.
Note
In cases where
CS
is used to wake the device, the
first SO data message is not valid.
The sleep command contains settings for two
programmable timers for Sleep mode, the interrupt timer and
the scan timer, as shown in
Table 18
The interrupt timer is
used as a periodic wake-up timer. When the timer expires, an
interrupt is generated and the device enters Normal mode.
Note
The interrupt timer in the 33975 device may be
disabled by programming the interrupt bits to logic [1 1 1].
Table 19
shows the programmable settings of the Interrupt
timer.
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 33975
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 15
) is generated and the device enters Normal mode.
Without switch state changes, the 33975 will reset the scan
timer, inputs become tri-state, and the Sleep mode continues
until the scan timer expires again.
Table 20
shows the programmable settings of the Scan
timer.
Table 20. Scan Timer
Note
The interrupt and scan timers are disabled in the
Normal mode.
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 19. 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
No interrupt wake-up
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
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| PC33975AEK | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Multiple Switch Detection Interface with Suppressed Wake-Up and 32mA Wetting Current |
| PC33975AR2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Multiple Switch Detection Interface with Suppressed Wake-Up and 32mA Wetting Current |
| PC33981PNA/R2 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:High-Frequency, High-Current, Self-Protected High-Side Switch (4.0 mз up to 60 kHz) |
| PC33984CHFKR2 | 制造商:Freescale Semiconductor 功能描述: |
| PC33989DW | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:System Basis Chip with High Speed CAN Transceiver |
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