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參數資料
| 型號： | VMX1C1020 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Versa Mix 8051 Mixed-Signal MCU |
| 中文描述： | 反之亦然混合8051混合信號微控制器 |
| 文件頁數： | 65/80頁 |
| 文件大?。?/td> | 3605K |
| 代理商： | VMX1C1020 |
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VMX51C1020
_________________________________________________________________________________________________
www.ramtron.com
page 65 of 80
Digitally Controlled Switches
The VMX51C1020 include a digital switch
composed of 4 sub-switches connected in
parallel. These sub-switches can be individually
controlled by writing to the SFR register at B7h.
F
IGURE
42:
SWITCH
F
UNCTIONAL DIAGRAM
SW1B
SW1A
sw1d sw1c sw1b sw1a
x
x
x
x
SWITCHCTRL register
The switch “ON” resistance is between 50 and
100 Ohms depending on the number of sub-
switches being used. If, for example, one sub-
switch is closed, the switch resistance will be
about 100 Ohms, and if all 4 switches are
closed, the switch resistance will go down to
about 50 Ohms.
T
ABLE
111:
(SWITCHCTRL)
U
SER
S
WITCHES
C
ONTROL
R
EGISTERS
-
SFR
B7
H
7
6
5
4
Not Used but implemented
Bit
Mnemonic
Function
Not used but implemented bits
Can be used as general
purpose storage
Switch 1 control (composed of 4
individual switches each bit
controlled)
The upper 4 bits of the SWITCHCTRL register
can be used as general purpose flags.
3
2
1
0
SWTCH1 [3:0]
7:4
User Flags
3:0
SWITCH1[3:0]
Analog Output Multiplexer
The VMX51C1020’s analog output multiplexer is
used for production test purposes and provides
access to internal test points of the analog signal
path.. It can however, be used in applications,
but due to its high intrinsic impedance, care
must be taken with respect to loading.
The analog output multiplexer shares its output
with the current source output and therefore
must be disabled when the current source or the
ADC is used.
Inversely, when the analog output multiplexer is
used, the current source must be powered
down.
The following table summarizes the analog
output multiplexer select line settings.
T
ABLE
112:
(OUTMUXCTRL)
A
NALOG
O
UTPUT
M
ULTIPLEXER
C
ONTROL
R
EGISTER
-
SFR
B6
H
7
6
5
4
3
-
-
-
-
-
Bit
Mnemonic
Function
7:3
Unused
Unused
2:0
TAOUTSEL[2:0]
Signal output on TA
000 – AIN0
001 – AIN1
010 – AIN2
011 – AIN3
100 – VBGAP
101 – reserved
110 – unused
111 – unused
2
TAOUTSEL [2:0]
1
0
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