參數(shù)資料
型號(hào)： MCZ33993EWR2
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
中文描述： 多交換檢測(cè)接口
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 504K
代理商： MCZ33993EWR2
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
33993
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
LOGIC COMMANDS AND REGISTERS
PROGRAMMABLE SWITCH REGISTER
Inputs SP0 to SP7 may be programmable for switch-to-
battery or switch-to-ground. These inputs types are defined
using the
settings command
(refer to
Table 5
). To set an SPn
input for switch-to-battery, a logic [1] for the appropriate bit
must be set. To set an SPn input for switch-to-ground, a logic
[0] for the appropriate bit must be set. The MCU may change
or update the Programmable Switch Register via software at
any time in Normal mode. Regardless of the setting, when the
SPn input switch is closed a logic [1] will be placed in the
Serial Output Response Register (refer to
Table 16
,
page
17
).
WAKE-UP INTERRUPT REGISTER
The
Wake-Up nterrupt Register defines the inputs that
are allowed to wake the 33993 from Sleep mode or set the
INT pin low in Normal mode. Programming the wake-up
nterrupt 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 6
). 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 nterrupt Register via
software at any time in Normal mode.
WETTING CURRENT REGISTER
The 33993 has two levels of switch contact current, 16 mA
and 2.0 mA (see
Figure 10
). The
metallic command
s used
to set the switch contact current level (refer to
Table 7
).
Programming the metallic bit to logic [0] will set the switch
wetting current to 2.0 mA. Programming the metallic bit to
logic [1] will set the switch contact wetting current to 16 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 10. Contact Wetting and Sustain Current
Table 5. Settings Command
Settings Command
Not used
Battery/Ground Select
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
0
0
0
1
X
X
X
X
X
X
X
X
sp7
sp6
sp5
sp4
sp3
sp2
sp1
sp0
Table 6. Wake-Up / nterrupt 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
0
0
0
0
0
0
1
0
X
X
X
X
X
X
X
X
sp7
sp6
sp5
sp4
sp3
sp2
sp1
sp0
0
0
0
0
0
0
1
1
X
X
sg1
3
sg1
2
sg1
1
sg1
0
sg9
sg8
sg7
sg6
sg5
sg4
sg3
sg2
sg1
sg0
Switch Contact Voltage
16 mA Switch Wetting Current
2.0 mA Switch Sustain Current
20 ms Wetting Current Timer
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