CN108089112B

CN108089112B - Bluetooth electronic scale PCBA batch test method and system

Info

Publication number: CN108089112B
Application number: CN201711145943.3A
Authority: CN
Inventors: 陈定平
Original assignee: Chipsea Technologies Shenzhen Co Ltd
Current assignee: Chipsea Technologies Shenzhen Co Ltd
Priority date: 2017-11-17
Filing date: 2017-11-17
Publication date: 2021-01-19
Anticipated expiration: 2037-11-17
Also published as: CN108089112A

Abstract

The invention discloses a Bluetooth electronic scale PCBA batch test method and a system, wherein the system consists of a Bluetooth PCBA test board and 4 PCBAs to be tested, and the Bluetooth PCBA test board comprises the following components: the device comprises a BLE DTM mode testing module, a BLE connection testing module, a power supply module, a TFT LCD module, a key module, a current detection module, a crystal oscillator frequency offset testing module and a master control MCU; the invention can test 4 PCBAs to be tested at the same time, so that the test efficiency is greatly improved compared with the traditional test method.

Description

Bluetooth electronic scale PCBA batch test method and system

Technical Field

The invention belongs to the technical field of electronic scales, and particularly relates to a testing method and device of a Bluetooth electronic scale.

Background

With the application of the microelectronic and internet of things technologies, the traditional electronic scale cannot meet the requirements of people due to single function. In order to change the problem that traditional electronic scale exists in the use, intelligent bluetooth electronic scale comes into production in return. Besides the weight measurement function of the traditional electronic scale, the intelligent Bluetooth electronic scale is matched with APP, and can analyze various human body composition parameters such as human body fat percentage, water percentage, muscle mass and BMI.

For example, patent application 201310078220.1 discloses a watch with health management function and a system thereof, wherein the watch comprises a main control panel, and a power supply, a key, a display screen, a vibration sensor and a bluetooth module which are respectively connected with the main control panel, and the main control panel receives data of weight, fat, moisture, muscle or BMI value transmitted by a pairing signal through the bluetooth module and displays the data on the display screen. The system comprises the watch with the health management function and an electronic scale, wherein the electronic scale comprises a scale main control panel, a weighing sensor, a scale display screen, a BIA testing module, a scale Bluetooth module and a scale power supply, the weighing sensor, the scale display screen, the BIA testing module, the scale Bluetooth module and the scale power supply are respectively connected with the scale main control panel, the weighing sensor is connected with a stress mechanism, the scale Bluetooth module can be paired with the Bluetooth module, and weight, fat, moisture, muscle or BMI value data obtained by the scale main control panel are transmitted to the Bluetooth module.

PCBA is the abbreviation of English Printed Circuit Board + Assembly, that is, the whole process of soldering electronic components on PCB blank Board. In order to reduce the failure rate of finished electronic scale products, the whole finished product scrapping caused by PCBA failure after the finished product is installed is reduced, and the Bluetooth electronic scale PCBA needs to be tested.

In the existing testing method of the Bluetooth electronic scale PCBA, the mobile phone Bluetooth is required to be connected with each PCBA board. This test method has the obvious disadvantages of:

A) and the testing efficiency is low. Because need use cell-phone APP to connect the bluetooth balance, need many times operation on the cell-phone APP, just can successfully connect the bluetooth balance, and during operation at every turn, can only carry out test operation to a bluetooth balance. Because the Bluetooth address of the current equipment cannot be known, the current Bluetooth scale to be tested cannot be known clearly when the current mobile phone APP is connected, and the Bluetooth scale can be confirmed by multiple operations. Due to the above reasons, the efficiency of the whole mass production test is low.

B) And the bluetooth RF test results are inaccurate. Due to the fact that the Bluetooth of different mobile phones has difference and tolerance degrees on error rates are inconsistent, test results of different mobile phones are inconsistent, and after a part of PCBA boards are tested successfully by the mobile phone A and replaced by the mobile phone B, the test results fail.

C) And partial parameters cannot be tested. Parameters such as crystal oscillator frequency deviation, transmitting power, transmitting and receiving power consumption, sleep power consumption and the like cannot be tested, so that hidden dangers cannot be eliminated.

Disclosure of Invention

Therefore, the invention primarily aims to provide a batch test method and a system for the PCBAs of the Bluetooth electronic scales, the method and the system can quickly test the PCBAs of the Bluetooth electronic scales, can accurately analyze the quality of wireless signals, and avoid the problems of complicated operation and inaccurate test result of the traditional test mode.

The invention also aims to provide a batch test method and a system for PCBA of the Bluetooth electronic scale, which have the advantages of high test efficiency, low cost, accurate and reliable test result and capability of testing parameters such as crystal oscillator frequency deviation, transmitting power, transmitting and receiving power consumption, sleep power consumption and the like.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a Bluetooth electronic scale PCBA batch test system is characterized in that the whole system is composed of a Bluetooth PCBA test board and 4 PCBAs to be tested, the Bluetooth PCBA test board is a test device of the whole system, and the Bluetooth PCBA test board can be simultaneously connected with the 4 PCBAs to be tested to test the 4 Bluetooth electronic scales PCBAs to be tested; the bluetooth PCBA test panel including: the device comprises a BLE DTM mode testing module, a BLE connection testing module, a power supply module, a TFT LCD module, a key module, a current detection module, a crystal oscillator frequency offset testing module and a master control MCU; because 4 PCBAs to be tested can be tested simultaneously, the test efficiency is greatly improved compared with the traditional test method.

Further, the BLE DTM mode testing module performs quantitative testing on the sending error rate and the receiving error rate of the 4 PCBAs to be tested, so that the sending and receiving performance of the PCBAs to be tested is definitely obtained. If the error rate is lower than a certain range, the packet loss problem is easy to occur in communication, and the PCBA is judged to be a defective product. The module can only detect the signal quality of a single channel.

Further, the BLE is connected with the testing module and used for carrying out frequency hopping testing on the PCBA to be tested.

Further, the current detection module detects the current of the PCBA to be detected.

Further, the crystal oscillator frequency offset test module performs frequency offset test on the PCBA to be tested. The method comprises the steps that a debugging interface of the PCBA to be tested is controlled, the PCBA to be tested outputs a PWM square wave, a master control MCU of the Bluetooth PCBA test board samples the PWM square wave output by the PCBA to be tested at a high speed, and whether the period of the square wave is in a frequency deviation range is judged, so that the crystal oscillator frequency deviation test is realized.

A Bluetooth electronic scale PCBA batch test method is characterized by comprising the following steps:

101. after the Bluetooth PCBA test board is powered on, initializing each module of the system;

102. the test was started on 4 PCBA to be tested.

Before testing, the key release is judged firstly, if the key is pressed, the test is started on the 4 PCBAs to be tested, otherwise, the key is waited to be pressed.

103. Performing DTM mode initialization on the 4 PCBAs to be tested through a debugging interface of the PCBA to be tested, so that the 4 PCBAs to be tested enter a DTM mode;

104. controlling the PCBA to be tested to send a DTM RF signal through a debugging interface of the PCBA to be tested, receiving the DTM RF signal by a Bluetooth PCBA test board, and calculating a sending packet error rate;

105. controlling the PCBA to be tested to receive the DTM RF signal through a debugging interface of the PCBA to be tested, sending the DTM RF signal through a Bluetooth PCBA test board, and calculating a receiving packet error rate;

106. controlling the PCBA to be tested to output a clock signal subjected to frequency division through a debugging interface of the PCBA to be tested, and carrying out high-speed sampling on the PWM clock signal by using the Bluetooth PCBA test board to test the period of the PWM clock signal;

and calculating the crystal oscillator frequency offset of the PCBA to be detected according to the period, and judging whether the crystal oscillator frequency offset is in a reasonable range.

107. Performing BLE normal mode initialization on the 4 PCBAs to be tested through a debugging interface of the PCBA to be tested, and enabling the 4 PCBAs to be tested to enter a BLE normal working mode;

108. searching the broadcast signal of the PCBA to be detected, judging whether the broadcast signal is normal, and simultaneously detecting the received RSSI (received signal strength indicator), thereby indirectly judging whether the Bluetooth transmitting power of the PCBA to be detected is within a reasonable range;

109. establishing Bluetooth connection with the PCBA to be tested, reading the characteristic value of the PCBA for multiple times, and judging whether the reading is successful each time; if the reading can be normally carried out, the frequency hopping communication is normal;

110. in the BLE connection communication process, testing the working current of the PCBA to be tested, and judging whether the transmitting current, the receiving current and the sleep current are in a reasonable range;

111. the test is ended.

The step 104 and the step 106 can be adjusted and set according to different PCBA to be tested, and do not need to be according to a fixed order.

Similarly, the 108-110 steps can also be adjusted and set according to different PCBA to be tested.

The invention has the following beneficial effects:

A) the PCBA to be tested can be tested simultaneously, intervention is not needed midway in the test, tedious operation of traditional mobile phone APP test is avoided, and test efficiency is improved.

B) The PCBA's that awaits measuring bluetooth communication error rate can be acquireed to accurate acquisition PCBA's that awaits measuring bluetooth RF performance guarantees that the PCBA bluetooth uniformity that the test came out is high, and communication is stable.

C) The frequency offset of the crystal oscillator of the PCBA to be tested can be tested, so that the problem of poor compatibility of a mobile phone caused by the frequency offset is avoided.

D) The system can test the instantaneous power consumption of RF transmission, RF reception, Sleep and the like, and not only test the average power consumption of the whole test process, thereby finding more potential risks.

Drawings

FIG. 1 is a block diagram of a test device architecture in which the present invention is implemented.

FIG. 2 is a flow chart of a test performed by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 is a hardware block diagram of a bluetooth electronic scale PCBA batch test system implemented by the present invention, which is shown in the figure. Whole system is surveyed the board by bluetooth PCBA, and 4 PCBA that await measuring constitute. The Bluetooth PCBA test board is a test device of the whole system and can simultaneously test 4 Bluetooth electronic scales to be tested. Because 4 PCBAs to be tested can be tested simultaneously, the test efficiency is greatly improved compared with the traditional test method.

The bluetooth PCBA test panel's constitution module has: BLE DTM mode test module, BLE connection test module, power supply module, TFT LCD module, button module, current detection module, crystal oscillator frequency offset test module, master control MCU. The realization functions of each module are as follows:

A) a BLE DTM mode test module:

the module carries out quantitative test on the sending error rate and the receiving error rate of the 4 PCBAs to be tested, thereby definitely obtaining the receiving and sending performance of the PCBAs to be tested. If the error rate is lower than a certain range, the packet loss problem is easy to occur in communication, and the PCBA is judged to be a defective product. The module can only detect the signal quality of a single channel.

B) BLE connection test module

In actual BLE communications, the signal will be frequency hopped. The BLE DTM mode test module can only carry out error rate test on a single signal channel and does not carry out frequency hopping test. The module is introduced to carry out frequency hopping test on the PCBA to be tested.

C) Power supply module

The module is mainly responsible for supplying power to the PCBA to be tested

D) TFT LCD module

The module is mainly responsible for displaying the test result.

E) Key module

This module mainly controls the start of the test procedure.

F) Current detection module

The module mainly detects the current of the PCBA to be detected.

G) Crystal oscillator frequency deviation testing module

When the frequency offset of the crystal oscillator of the PCBA to be detected is not within a reasonable range, the mobile phone cannot be normally connected and communicated, and the compatibility problem of the mobile phone is very easily caused, namely, part of the mobile phone can be normally used, and part of the mobile phone cannot be normally used. In order to control the frequency offset of the crystal oscillator within a reasonable range, the frequency offset test of the PCBA to be tested is required. And controlling a debugging interface of the PCBA to be tested to enable the PCBA to be tested to output a PWM square wave. The master control MCU of the Bluetooth PCBA test board samples the PWM square wave output by the PCBA to be tested at a high speed and judges whether the period of the square wave is in the frequency deviation range, thereby realizing the frequency deviation test of the crystal oscillator.

H) And a main control MCU

The module is the heart of the whole system, and the control of each module of the whole system is realized.

The testing work flow realized by the invention is shown in figure 2. The workflow is illustrated as follows:

A) and after the Bluetooth PCBA test board is powered on, each module of the system is initialized.

B) And judging that the key is released and pressed, if the key is pressed, starting to test the 4 PCBAs to be tested, and if not, waiting for the key to be pressed.

C) And after the key is pressed down, starting to test the 4 PCBAs to be tested.

D) Carrying out DTM mode initialization on 4 PCBAs to be tested through debugging interfaces of the PCBAs to be tested, and enabling the 4 PCBAs to be tested to enter DTM modes

E) And controlling the PCBA to be tested to send the DTM RF signal through the debugging interface of the PCBA to be tested, and controlling the Bluetooth PCBA test board to receive the DTM RF signal and calculating the error rate of the sending packet.

F) And controlling the PCBA to be tested to receive the DTM RF signal through the debugging interface of the PCBA to be tested, sending the DTM RF signal through the Bluetooth PCBA test board, and calculating the error rate of the received packet.

G) Through the debugging interface of the PCBA to be tested, the PCBA to be tested is controlled to output a clock signal (namely a PWM square wave) after frequency division, and the Bluetooth PCBA test board performs high-speed sampling on the PWM clock signal and tests the period of the PWM clock signal. And calculating the crystal oscillator frequency offset of the PCBA to be detected according to the period, and judging whether the crystal oscillator frequency offset is in a reasonable range.

H) Through PCBA's that awaits measuring debugging interface, carry out BLE normal mode initialization to 4 PCBA that await measuring, make 4 PCBA that await measuring get into BLE normal operating mode

I) Searching the broadcast signal of the PCBA to be detected, judging whether the broadcast signal is normal or not, and simultaneously detecting the received broadcast signal RSSI (received signal strength indicator), thereby indirectly judging whether the Bluetooth transmitting power of the PCBA to be detected is in a reasonable range or not.

J) And establishing Bluetooth connection with the PCBA to be tested, reading the characteristic value of the PCBA for multiple times, and judging whether the reading is successful each time. If the reading can be normally carried out, the frequency hopping communication is normal.

K) And in the BLE connection communication process, testing the working current of the PCBA to be tested. And judging whether the transmitting current, the receiving current and the sleep current are in a reasonable range.

L), finish the test.

Therefore, the beneficial effects of the invention are mainly as follows:

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A Bluetooth electronic scale PCBA batch test method is characterized by comprising the following steps:

102. starting to test 4 PCBAs to be tested;

106. controlling the PCBA to be tested to output a PWM clock signal through a debugging interface of the PCBA to be tested, and carrying out high-speed sampling on the PWM clock signal by using the Bluetooth PCBA test board to test the period of the PWM clock signal;

111. the test is ended.

2. The method for batch testing of PCBAs of Bluetooth electronic scales as claimed in claim 1, wherein in step 102, before testing, it is determined that the button is released and pressed, if the button is pressed, testing of 4 PCBAs to be tested is started, otherwise, the button is waited for pressing.

3. The method for batch testing of PCBAs (printed circuit boards assemblies) of Bluetooth electronic scales as claimed in claim 2, wherein in the step 106, the crystal frequency deviation of the PCBAs to be tested is calculated according to the period, and whether the crystal frequency deviation is within a reasonable range is judged.