Testing method of single bus chip

Abstract

The invention provides a testing method of a single bus chip. The testing method includes the following steps; a first pin of a testing host machine is connected to a first base pin of the chip, a second pin of the testing host machine is connected to a second base pin of the chip, one of the first base pin and the second base pin is a data base pin, and the other is a grounding base pin; the first pin is arranged as a data output pin and outputs grounding signals, and the second pin is arranged as a data input pin; after the chip is powered on, the testing host machine reads the signals input by the second pin and judges whether the read signals are low level signals or not, if the read signals are the low level signals, the first pin is arrranged as the data input pin, the second pin is set as the data output pin, outputs the grounding signals, and communication with the chip is carried out by the first pin; and if the read signals are not the low level signals, the communication with the chip is carried out by the second pin. According to the testing method, the testing host machine can identify the base pins of the chip automatically, set the working modes of the pins according to the conditions of the base pins and improve testing efficiency.

Description

technical field [0001] The invention relates to the field of chip testing, in particular to a testing method for a single-bus chip. Background technique [0002] Existing imaging devices, such as inkjet printers or laser printers, are equipped with consumable containers, such as ink cartridges or toner cartridges, which are detachably installed in the imaging devices to accommodate printing consumables, such as ink or toner. Most of the existing consumable containers are equipped with chips, and the imaging device is also provided with a circuit board, and the circuit board is provided with a controller, and the controller communicates with the consumable container. The communication between the controller and the chip is through a single bus, so most consumable chips are also equipped with a single bus chip, such as the chip produced by Dallas Company. [0003] Since the consumable chip needs to store data related to the imaging device and the consumable container, after t...

AI Technical Summary

Problems solved by technology

[0006] However, the single-bus chip has strict requirements on the connection of the pins and the input and output signals of the pins. Once the connection between the ground pin GND and the data pin DAT is wrong, for example, the data pin DAT is connected to the ground pin of the microcontroller 10. Connect the ground pin GND to the pin GPIO of the single-chip microcomputer 10, and the chip 11 will not work

However, since many single-bus chips do not clearly mark the ground pin GND and the data pin DAT on the appearance, it is easy to confuse the two pins during the test, that is, to connect the two pins in reverse, resulting in the test unsuccessful

At this time, it is necessary to reversely connect the connecting wires of the two pins to perform the test, which brings great inconvenience to the test operation and also leads to low test efficiency.

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