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參數(shù)資料
| 型號(hào)： | M494 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SINGLE-CHIP VOLTAGE TUNING SYSTEM WITH 4 ANALOG CONTROLS AND mP INTERFACE |
| 中文描述： | 單片電壓調(diào)整系統(tǒng)，4模擬控制和MP接口 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 223K |
| 代理商： | M494 |
FUNCTIONAL DESCRIPTION
(continued)
AudioVisual Outputs
Two audiovisualoutputsareprovidedfor automat-
ic selection of a VCR and/or personal computer.
The logicstateofthepinsdependsontheAVoption
selected, the program option and the program
number selected according to the truth tables be-
low :
Table 3 :
AVOption 1 (16/20 Programs)
Program
16/0
15/19
Others
AV0
1
0
0
AV1
0
1
0
Table 4 :
AVOption 2 (16/20 Programs)
Program
8/8
7/7
6/6
Others
AV0
1
0
1
0
AV1
0
1
1
0
External pullup resistors must be used to realisea
logic HI as the outputs are open drain transistors.
See I/OConfiguration.
AFC Defeat Output
The AFC defeatoutput is a TTLcompatiblesignal
that is capableof switching the AFC circuitry inand
out. The AFC defeat output is pulled LO on any
program change including memory sequence up
and downand isheldLOfor 500ms afterexecution
of the command. When tune up or downare com-
mandedtheAFCdefeatoutputistakento logicLO.
After the tuning operation the AFC defeat is held
LO for 1 second after the key is released (see
Figure 9). Onpower on& start up resets it is taken
to logic LO for approx. 1.1 seconds.
AFC DEFEAT
OUTPUT
TUNE UP/DOWN:
KEYED
RELEASED
1s
4
Figure9
Standby
The standby output is a push pull output capable
of directly drivingan NPN transistor for switching
a relay. The states of this pin are defined in the
definition of terms. When standbyis commanded,
availablefrom allcommand sourcesas Standbyor
On/Standbycommands, the standby outputis en-
abled.
If the device goes into Standby from On then any
program command will bring the device On with
that programselected.On/Offcommand from key-
board only will execute the Off function.
On/Standby, Memory sequence up or down, 1 *
and
±
10(decade)commands from any command
source will bring the device On in the program
selected before Standbywith the displayshowing
that program only, i.e. the device executes an On
command only.
IfthedevicegoesintoStandbyfromPowereddown
thenthe On/Offcommand from keyboardonly and
any program command, On/Standby,Memory se-
quence up or down, 1 * and
±
10 (decade) com-
mands from any command source will bring the
device On in program 1. i.e. the device executes
an On command only.
Option Select
The Option select pin provides an extra line that
performs a ”hard wired keyboard function” in con-
junction with the keyboard scanning lines D0-D4.
This line has integrated logic associated with it
that enables one or many of the functions to be
active simultaneously. In contrast, the keyboard
inputs a-g will allow one key active at any given
time. See keyboard section.
Various optionscan be selectedby the connection
or not of a diode as shown in Figures 7 & 8.
From left to right along the Option select line col-
umn 1 selects the number of programs. A diode
connectedhere selects 20 programs (full comple-
ment)and no diode (default) selects16 programs
onlythat can be accessed.The 20 program option
only enables selection of 1 * or decade modes in
column 4. In column 2 the AV option defines the
stateof the AVoutputs for two protocols.
ThesearedescribedinsectionAudiovisualoutput.
Column3definesthestatethe M494powersup in.
If no connectionof a diode (default) is made here
the device powers up in the Off state. If a diode is
present then the device powersup in the Standby
state. In column 4, activated by the 20 program
option only, the presence of a diode places the
device in 1 * mode and the absence of a diode
selects decade mode. The diode and switch in
column 5 defeats the skip condition and enables
program memory words to be read with the skip
flag set.
This allows programming (or reprogramming) of
previouslyskipped words.
M494
12/22
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