ZM407 [ETC]

Peripheral IC ; 周边IC\n


型号：	ZM407
厂家：	ETC
描述：	Peripheral IC 周边IC\n
文件：	总4页 (文件大小：66K)
中文：	中文翻译
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Features

Application

Description

n A/D conversion with 6-bit

resolution

n Time base programmable

from 50ns to 3.27 ms (at

a clock frequency of 20

MHz)

n Trigger Modes: Auto, In-

ternal + /-, External + /-

n 5 discrete trigger levels

n Internal SRAM for 128

values

n SRAM bypass mode

n Shift of base line by ad-

justable offset

The Graphic Signal Monitor IC

was developed for visualization

of the time behavior of electri-

cal signals. Interaction with an

external µC makes it possible

to achieve the functionality of a

one-channel digital storage

oscilloscope with additional

digital voltmeter function.

After the parameters of time

basis, trigger level and trigger

mode have been loaded into

the control register, the recor-

ding starts as soon as the trig-

ger condition occurs. This

procedure ends when 128

times 6 bit data have been

written from the flash A/D con-

verter into the internal SRAM.

The small dimensions as well

as a minimum of external wi-

ring facilitate both the applica-

tion in miniaturized measuring

devices for service and test

area, and placement near the

front panels in control panels

and switch cabinets.

Afterwards, an externally con-

nected microcontroller can

read the data and formate it for

an LC display or for transmis-

sion via an interface.

n Supply voltage 5 Volts

n Bidirectional µC interface

n Power-down for analog

part

n PLCC44 package

Block Diagram

SRAM

ADC

A_IN

Z_IN

uC Interface

MUX

REFT

REF

REFB

PARITY

DIO_0..7

OUT_10

STATUS

TRIGGER

TIME BASE

OUT_100

SEL_AC

SEL_DC

CONTROL

LD-DISPL

EN_REC

EXT_PWR

BP_RAM

T_IN

CPUCLK

WR_TEST

TRIG_OUT

TRIG_IN

DISP_DATA

DISP_CLK

SHIFT REG

Functional Description

The input amplifier serves for

impedance matching and

amplifies the input signal.

The measured signal is digiti-

zed in an analog-to-digital

converter operating according

to the flash principle. When the

measurement is activated, it

converts the input signal into a

6-bit digital word at a fixed

conversion rate of 20 MHz.

depending on the level of the

input signal, in an automatic or

edge- and level triggered mo-

de.

In order to allow also bipolar

input signals to be processed

even if there is only one supply

voltage, a level shift takes

place in the input amplifier.

Using an external potentiome-

ter, such shift can be varied

into a base line shift.

For this purpose, there is a

comparator, the reference level

of which can be selected in five

discrete stages. The compara-

tor has been provided with a

hysteresis for noise suppressi-

on.

The 63 comparators of the

flash ADC consist of a differen-

tial stage with subsequent

latch.

The measuring range can be

extended by connection of an

external voltage divider. An AC

input can be implemented by

means of an additional external

capacitor. Two special inputs

of the integrated circuit can be

connected with the external

voltage divider; they supply a

low current during the measu-

rement pauses. The resulting

voltage at the pins indicates

the selected measurement

range. Two more pins have

been provided for detection of

the selected signal coupling

type. The external AC/DC

The Control unit coordinates

the circuit functions, such as

the data exchange via the inter-

face. Measured data and status

information are output in paral-

lel. The loading of the time

base, trigger level, trigger mo-

de parameters into registers,

which is uncritical with regard

to time, is done serially via 2

pins of the bidirectional inter-

face.

For storaging the measured

data, the integrated circuit

contains an SRAM which is 6

bits wide and 128 values deep.

The SRAM Write signal is ge-

nerated by the Time Base unit

by means of a programmable

shift register.

The time base is freely se-

lectable within the range from

2⁰to 2¹⁶times the clock peri-

od.

The analog part of the circuit is

activated only during the short

data recording time, which

significantly reduces the total

power consumption.

Connection with a 20-MHz

quartz will result in a range

from 50ns to 3,27ms.

switch is to tie the pins to gro-

und. The status information

about measurement range and

coupling type, multiplexed with

the measured data, is provided

for interpretation at the bidi-

rectional interface.

The RAM bypass mode creates

more possibilities of applicati-

on; the values are output di-

rectly to the bidirectional inter-

face, not into the RAM.

For special applications, e. g.

for control of an LCD module, a

shift register has been imple-

mented. Loading of information

into the shift register is parallel,

while the output is serial via

two pins.

The measurement can be initia-

ted by an external signal or,

controlled by the trigger logic,

Pin Configuration

39 38 37 36 35 34 33 32 31 30 29

10 11 12 13 14 15 16 17

Pin Description

Name

IN/OU Description

Name

IN/OUT Description

Power Supply Connections

Digital Outputs

VDD

VDDA

Pos. supply voltage, digital

Pos. supply voltage, analog

CPUCLK

O (ub)

Analog power-down

5 MHz clock (for proces-

sor)

VSS

VSSA

AGND

Neg. supply voltage, digital

Neg. supply voltage, analog

Signal ground

WR_TEST

TRIG_OUT

DISP_CLK

RAM Write mode active

Trigger output

1.25 MHz clock

(Display data clock)

Display data serial

Analog Inputs

DISP_DATA

A_IN

T_IN

Z_IN

Analog signal input

Trigger signal input

Zero-level input

Data I/Os

PARITY

bid

Bid. data pin (parity)

Bidirectional data inter-

face

28...21 DIO_0...7

Digital Inputs

Analog Outputs

OUT_10

OUT_100

I (puc) Status 1 (10V area switch)

I (puc) Status 2 (100V area switch)

REFT

REFB

Reference voltage (top)

Reference voltage

(bottom)

SEL_AC

SEL_DC

N_MODE

TRIG_IN

EN_REC

I (pu)

Status 3 (AC operation)

Status 4 (DC operation)

Control 1 (operating mode)

Trigger input

VED

Internal base potential

External Components

XOUT

XIN

Crystal output

Qrystal input

Enable Record

Follower stage,

Connection to trim-C

Amplifier ,

Connection to trim-C

A/D converter

LD_DISPL

EXT_PWR

BP_RAM

Load Display

Control 2 (external power)

Bypass Ram Mode

power bypass capacitor

Test Pins

TRESULT

TEST

I (pd)

Test mode output

Test mode input

pu = Internal Pull-Up

puc = Internal Pull-Up Controlled

pd= Internal Pull-Down

ub = Unbuffered output

Characteristics (Selection)

Maximum Ratings

Symbol

Min

Typ

Max

Unit

General

Supply voltage (VDDA= VDD)

Oscillator frequency

Operating temperature

Current drain

V_DD

f_q

4.75

5.0

5.25

MHz

^oC

I_S

100

Digital

Input H-level

Input L-level

Output H-level (2mA, pin32: 8mA))

Output L-level (-2mA, pin32 -8mA)

Analog Part

Input voltage

Input resistance

Input capacitance

A/D Converter

V_IH

V_IL

V_OH

V_OL

V_DD-0.8

2.4

0.8

0.4

+ 0.5

V ,V

-0.5

100

is it

R ,R

is id

C_is,C_it

Resolution

Differential non-linearity

Integral non-linearity

radc

DNL

INL

Bit

LSB

0.8

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.

and byte-serial form at DIO(0 to

5).

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 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.

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

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.

DISP_DATA (data).

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.

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.

The integrated circuit is now

ready to record measured va-

lues, which happens as soon

as the trigger condition occurs.

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.

Subsequently, the microcon-

troller, by clocking of

LD_DISPL, reads out the con-

tents of the SRAM in bit-parallel

A shift register is available in

the integrated circuit for special

applications. In the application

shown below, it controls an

Application Circuit

SCOPE IC

uController

RS232

Y-POSITION

REFT

DIO1..7

PARITY

Z_IN

REFB

EN_REC

LD_DISPL

CPUCLK

A_IN

OUT_10

OUT_100

AC/DC

DISP_DATA

DISP_CLK

LC Display

10V/100V

SEL_AC

SEL_DC

T_IN

TRIG_OUT

TRIG_IN

TRG

ZM407 [ETC]

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