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參數(shù)資料
| 型號： | ZM407 |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運(yùn)算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 63K |
| 代理商： | ZM407 |
4
Notes for Application
Before starting the measure-
ment, the parameters of time
base, trigger level and trigger
mode are to be serially loaded
to DIO(0) (clock) and DIO(1)
(data) by the microcontroller.
The recording of measured
values is prepared by activati-
on of EN_REC.
Then, the IC outputs the status
of the 4 pins for measurement
range and AC/DC coupling to
DIO(2 to 5) (parallel), until a
High pulse is applied to the
LD_DISPL pin.
The integrated circuit is now
ready to record measured va-
lues, which happens as soon
as the trigger condition occurs.
Subsequently, the microcon-
troller, by clocking of
LD_DISPL, reads out the con-
tents of the SRAM in bit-parallel
and byte-serial form at DIO(0 to
5).
The measured data and status
information taken over are
prepared in the external micro-
controller in a way that allows
to indicate them on an external
LC display or to transfer them
to a computer, for instance,
formatted according to the
RS232-Protocol.
For digital voltmeter functions,
the microprocessor can calcu-
late the average value of all
128 recorded measured valu-
es, and, by multiplying them by
0.7, it can determine the
approximate effective value.
This value can be shown on
the display as well.
A shift register is available in
the integrated circuit for special
applications. In the application
shown below, it controls an
LCD module of 16 x 32 pixels.
The microcontroller loads the
data available in parallel at DIO
(0 to 7) as well as the parity
information into the register.
The process of loading is con-
trolled by means of the signals
EN_REC and LD_DISPL. A
start and stop bit are added,
then the output takes place at
DISP_CLK (data) and
DISP_DATA (data).
When using the ZM407, it is
absolutely necessary to ensure
synchronous operation of the
system. Therefore, a 5-MHz
system clock for an external
microcontroller is provided at
the CPUCLK pin.
Multi-channel recording is
possible by cascading of se-
veral SCOPE ICs. In this case,
one TRIG_OUT output will
control several TRIG_IN inputs.
Application Circuit
SCOPE IC
DIO1..7
PARITY
EN_REC
LD_DISPL
CPUCLK
REFT
Z_IN
REFB
A_IN
OUT_10
OUT_100
SEL_AC
SEL_DC
T_IN
DISP_DATA
DISP_CLK
TRIG_OUT
TRIG_IN
AC/DC
10V/100V
TRG
IN
Y-POSITION
uController
LC Display
RS232
TX
RX
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