Test-Ok EC-test-mate Guía rápida de usuario

eC-test-mate

Hardware Reference Manual

Version 1.1.0.0.

10/21/2014

Table of contents

Overview ..................................................................................... 3

eC-test-mate types ..................................................................... 4

eC-test-mate Type I (TCC 211) ................................................. 5

Functional description ................................................................................. 5

Analog Inputs (101..104) ............................................................................ 5

Analog Outputs (101..104) .......................................................................... 7

Digital Inputs (101..104) ............................................................................. 8

Digital Outputs (Group 101 and 102) ............................................................ 9

Bi-Directional Digital I/O ............................................................................ 10

Serial Channel (UART 101) ........................................................................ 11

Programmable Power Supply (Supply 101) .................................................. 13

Board Presence ......................................................................................... 14

Pin assignment Type I .............................................................................. 15

Footprint technical drawings Type I ......................................................... 17

eC-test-mate Type II (TCC 212) .............................................. 19

Functional Description .............................................................................. 19

Analog Inputs (201..202) ........................................................................... 19

Digital Inputs (201..204) ............................................................................ 20

Digital Outputs (Group 201 and 202) .......................................................... 20

Bi-Directional Digital I/O ............................................................................ 20

Serial Channel (UART 201) ........................................................................ 20

RS485 (RS485 201) ................................................................................... 21

CAN (CAN 201) ........................................................................................ 21

I2C (I2C 201) ........................................................................................... 22

Programmable Power Supply (Supply 201) .................................................. 22

Board Presence ......................................................................................... 22

Pin assignment Type II ............................................................................. 23

Footprint technical drawing Type II ......................................................... 25

eC-test-mate Type III (TCC 213) ............................................ 27

Functional description ............................................................................... 27

Analog Inputs (301..308) ........................................................................... 27

Analog Outputs (301..304) ........................................................................ 28

Digital Inputs (301..308) ............................................................................ 28

Digital Outputs (Group 301) ....................................................................... 28

Programmable Power Supply (Supply 301) .................................................. 28

Board Presence ......................................................................................... 28

Pin assignment Type III ........................................................................... 29

Footprint technical drawing Type III ....................................................... 32

eC-test-mate Docking Station .................................................. 34

eC-test-mate Dimensions ......................................................... 35

Overview

The eC-test-mate is a family of portable devices for production testing of printed circuit boards (PCBs). The

devices (Test Probes) are controlled by a command language on a PC to which they are connected via

USB. Each Test Probe type provides a fixed number of functions. By combining multiple Test Probes, it is

possible to create a customized of test features.

Working voltages are in the range of 0..24V for most test functions (e.g. power supply, digital and analog I/

O) except where this is not useful (e.g. UART or I2C). All inputs and outputs are protected against higher

voltages however. Although care has been taken to protect the electronics as much as possible (see the

description for each functional group in the corresponding Test Probe Type chapter), applying too high

voltages may result in damage to the device.

Unlike the TEST-OK fixture, the Test Probes are connected directly to the Unit Under Test (UUT hereafter)

without an intermediate nail bed. In order to be testable with one or more Test Probes, it is necessary that

the required pattern of test points and associated holes (the footprint) be present on the UUT.

Each Test Probe type has a unique footprint so that it is impossible to connect a Test Probes to the wrong

test points.

An eC-test-mate Docking Station is available as well. The main advantage of plugging a Test Probe into the

Docking Station is that the power that can be delivered by the Test Probe's power supply is increased. The

USB standard limits the output current to 500mA which results in a maximum output power of 2.5W. About

2W of this is available to the power supply. When connected to the eC-test-mate Docking Station, the

maximum power that is available is 7W or 1A output current whichever limit is reached first.

eC-test-mate types

eC-test-mate Type I - green -

General purpose tester with a power supply: four analog inputs, four analog outputs and four digital

bidirectional in/outputs and four digital outputs and a UART for serial communication.

eC-test-mate Type II - blue -

This type focuses on communication interfaces. Besides a power supply, two analog inputs and four digital

bidirectional in/outputs and four digital outputs, interfaces for some common standards are provided: CAN,

RS485, I2C and UART.

eC-test-mate Type III - red -

Another general purpose tester with multiple functions on some pins for optimal flexibility. Eight pins can be

used as analog input or digital input. Furthermore, four analog outputs are provided and one group of seven

digital outputs with programmable logic '1' level.

As every eC-test-mate, a programmable power supply is available as well.

Combining eC-test-mates into a bigger tester

If the Unit Under Test (UUT) requires more test points then there are available on one or when the mix of

required test functions is not available from a specific eC-test-mate type, then it is possible to combine

multiple eC-test-mates.

There is one restriction however: it is not possible to combine multiple eC-test-mates of the same type. It is

easy to see why: since two identical eC-test-mates cannot be physically distinguished, it is possible to

interchange the two eC-test-mates when connecting them to the UUT. Besides unexpected test results, this

may even damage the UUT if e.g. the wrong power supply is set to a too high voltage.

In order to distinguish between common functions (like power supplies or digital/analog I/O) on different eC-

test-mates, the functions are numbered with a global 3-digit numbering scheme in which the first digit

indicates the eC-test-mate type. As an example, all eC-test-mates have at least one power supply. The

power supply of Type I is Supply 101 while the one of Type II is Supply 201. The same applies e.g. to analog

inputs: Type I has analog input 101..104 while Type III has analog inputs 301..308

eC-test-mate Type I (TCC 211)

General purpose tester with a power supply: four analog inputs, four analog outputs and four digital

bidirectional in/outputs and four digital outputs and a UART for serial communication.

Functional description

This section describes all the functional blocks of the eC-test-mate Type I.

Besides the electrical specification of the interface pins on the connectors of the eC-test-mate Type I there

are also references to the TEST-OK Description Language (TDL) commands that can be used to control the

functional blocks.

A block diagram of the eC-test-mate Type I is shown in the figure below:

The eC-test-mate Type I board is connected to a PC via USB. Via this connection, information about outputs

to be set and values of inputs are exchanged about five times per second.

Analog Inputs (101..104)

There are four identical high impedance analog inputs on the board which are fed into 12-bit Analog-to-Digital

Converters (ADC for short). It is sampled at 2kHz and digitally filtered. The valid input voltage range is

100mV..24V, with a resolution of 1 mV.

Input specifications

Input impedance: 1.8MΩ

Input range: 100mV .. 24V

Resolution: 1 mV

Accuracy: 20mV or 0.2%

Sampling rate: 2kHz with digital filtering.

The maximum allowed input voltage that will not result in damage is 44V.

Associated test command(s):

• TEST_ANALOG

• MAP

Analog Outputs (101..104)

Four identical analog outputs can be independently programmed with an output voltage between 0 and 24V.

The output voltage is controlled by a 12-bit Digital-to-Analog Converter (DAC for short) and the resulting

precision is therefore 6 mV.

Note that voltages close to 0V may experience an error up to 30mV.

The outputs are protected against short circuit by means of a 100Ω series resistor. Clamping diodes protect

the outputs against voltages above 26V and below 0V if such voltages were inadvertently applied to the

outputs.

All outputs are set to 0V when communication is lost with the PC.

The maximum output current per channel is:

• 40 mA Source

• 20 mA Sink

Note: however that there will be a voltage drop across the internal 100Ω series resistor, resulting in a lower

voltage on test pin.

Output specifications

Input range: 100mV .. 24V

Resolution: 6 mV

Accuracy:

100mV .. 1V 20mV

1V and higher 0.1% (typically 0.05% above 3V)

Associated test command(s):

• SET_ANALOG

• MAP

Digital Inputs (101..104)

There are four digital inputs. The inputs contain a Schmitt trigger circuit and therefore have a hysteresis: the

digital level goes from '0' to '1' at 1.5V while remains '1' until the voltage drops below 0.75V.

Input impedance: 1MΩ

The maximum specified working input voltage is 24V. Clamping diodes protect the inputs against voltages

above 25V and below 0V.

The maximum allowed input voltage that will not result in damage is 31V.

Some of the inputs have extra functionality:

Inputs 101..104

Inputs 101..104 are located on the same test pins as (open collector) output bits 1..4 of group 102, making

them useful for testing bidirectional signals.

Note however the 330R resistor between the open collector output and the test pin!!!

Associated test command(s):

• TEST_DIGITAL

• MAP

Digital Outputs (Group 101 and 102)

For optimal flexibility, the digital outputs are separated into two groups. The output voltage corresponding to

a '1' can be programmed separately for group 101. Group 102 has open drain outputs meaning that

'configuration' of the '1' output level must be done via an external pull-up resistor if necessary.

All outputs are switched off when communication is lost with the PC.

Group 101

Specifications: VoutH = 2.5..24V,

VoutL = 0V

Isource max = 40mA, Isink Max 20mA,

Rout = 100Ω

Group 101, is protected against short circuit by means of a 100Ω series resistor. Clamping diodes protect

the outputs against voltages above 25V and below 0V if such voltages were inadvertently applied to the

outputs.

Note: the internal 100R resistor can only dissipate 100mW. E.g. when the output is programmed for 5V and

24V is applied on the corresponding EC-test-mate pin, then there will be a voltage of 18.5V across the 100R

resistor which would result in 3.4W dissipation!

Note: besides the maximum current, there is also a limit on dissipated power by the outputs. The total

power dissipated by bits 1..4 shall not exceed 500mW

Note: the configured output voltage of Group 101 is also used to determine the logic '1' output level of the

serial channel as long as the voltage is less or equal to 5V (above this voltage, the serial output is fixed to

5V independently of the Group 101 voltage)

Note: the outputs of group 101 are not rail-to-rail (LM324) and special care must be taken when the outputs

must sink a pull-up on the UUT. If the load to be sinked is less than 10kΩ, then an offset voltage will be

present on the output. As an example, if a 1KΩ pull-up to 5V is connected to an output, then the output

voltage will not go lower than 1.4V!!

Group 102

Group 102 consists of four 'open drain' outputs, pulling the output to GND via a 330R series resistor. The

outputs share the same test pins as digital inputs 101..104 making these pins 'bi-directional'.

Setting a '1' with the SET_DIGITAL command on the open drain outputs will activate the output. I.e. the

output will pulled to GND.

When the output is pulled up to a positive voltage, the output may seem inverted since setting a '1' via the

SET_DIGITAL command will result in a '0' on the output!

Note: due to the series resistor at the input pins, the open-drain outputs have this series resistor as well,

resulting in a voltage divider. This may cause unexpected behaviour is low resistance pull-up resistors are

present.

Associated test command(s):

• CONFIG_DIGITAL_GROUP

• SET_DIGITAL

• MAP

Bi-Directional Digital I/O

With the eC-test-mate Type I, it is possible to test up to 4 bi-directional digital signals.

As described in previous two sections, the 4 output bits of Group 102 are located on the same connector

locations as digital inputs 101..104. Since the outputs are open-collector outputs, the line can be left floating

by setting the output to '0'. A pull-up resistor shall be present on the UUT.

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