OPERATIONAL MODES WAKE-UP/INTERRUPT REGISTER" />
參數(shù)資料
型號： MC33975TEKR2
廠商： Freescale Semiconductor
文件頁數(shù)： 9/32頁
文件大?。?/td> 0K
描述： IC SWITCH DETECT MULT 32-SOIC
標(biāo)準(zhǔn)包裝： 1,000
應(yīng)用： 開關(guān)監(jiān)控
接口： SPI 串行
封裝/外殼： 32-SSOP（0.295"，7.50mm 寬）裸露焊盤
供應(yīng)商設(shè)備封裝： 32-SOICW 裸露焊盤
包裝： 帶卷 (TR)
安裝類型： 表面貼裝
Analog Integrated Circuit Device Data
Freescale Semiconductor
17
33975
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
WAKE-UP/INTERRUPT REGISTER
The Wake-up/Interrupt Register defines the inputs that are
allowed to wake the 33975 from Sleep mode or set the INT
pin low in Normal mode. Programming the wake-up/interrupt
bit to logic [0] will disable the specific input from generating
an interrupt and will disable the specific input from waking the
IC in Sleep mode (refer to Table 7). Programming the wake-
up/interrupt bit to logic [1] will enable the specific input to
generate an interrupt with switch change of state and will
enable the specific input as wake-up. The MCU may change
or update the Wake-up/Interrupt Register via software at any
time in Normal mode.
WETTING CURRENT REGISTER
The 33975 has two levels of switch-to-ground contact
current, 32 and 4.0 mA, and two levels of switch-to-battery
contact current, 16 and 2.0 mA (see Figure 11). The metallic
command is used to set the switch contact current level (refer
to Table 8). Programming the metallic bit to logic [0] will set
the switch wetting current to 2.0 mA/4.0 mA. Programming
the metallic bit to logic [1] will set the switch contact wetting
current to 16 mA/32 mA. The MCU may change or update the
Wetting Current Register via software at any time in Normal
Mode.
Wetting current is designed to provide higher levels of current
during switch closure. The higher level of current is designed
to keep switch contacts from building up oxides that form on
the switch contact surface.
Figure 11. Contact Wetting and Sustain Current
for Switch-to-Ground Input
WETTING CURRENT TIMER REGISTER
Each switch input has a designated 20 ms timer. The timer
starts when the specific switch input crosses the comparator
threshold (4.0 V). When the 20 ms timer expires, the contact
current is reduced from 16 to 2.0 mA for switch-to-battery
inputs and 32 to 4.0 mA for switch-to-ground inputs. The
wetting current timer may be disabled for a specific input.
When the timer is disabled, wetting current will continue to
flow through the closed switch contact. With multiple wetting
current timers disabled, power dissipation for the IC must be
considered.
The MCU may change or update the Wetting Current Timer
Register via software at any time in Normal mode. This allows
the MCU to control the amount of time wetting current is
applied to the switch contact. Programming the wetting
current timer bit to logic [0] will disable the wetting current
timer. Programming the wetting current timer bit to logic [1]
will enable the wetting current timer (refer to Table 9).
Table 7. Wake-Up /Interrupt Command
Wake-up/Interrupt 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
1
0
X
sp7 sp6 sp5 sp4 sp3 sp2 sp1 sp0
0
1
X
sg1
3
sg1
2
sg1
1
sg1
0
sg9 sg8 sg7 sg6 sg5 sg4 sg3 sg2 sg1 sg0
Switch Contact Voltage
32 mA Switch Wetting Current
4.0 mA Switch Sustain Current
20 ms Wetting Current Timer
Table 8. Metallic Command
Metallic 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
1
0
X
sp7 sp6 sp5 sp4 sp3 sp2 sp1 sp0
0
1
0
1
X
sg1
3
sg1
2
sg1
1
sg1
0
sg9 sg8 sg7 sg6 sg5 sg4 sg3 sg2 sg1 sg0
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