As for the common EEPROM chip on the car, it is divided into three types according to its interface mode: I2C, Microwire and SPI, but each chip is divided into various capacity specifications, such as 24C01, 24C02, 24C04 in I2C. The large mantissa has a smaller capacity than the mantissa and has a direct multiple relationship.
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Among them, the car audio uses the most types of chips, from I2C's 24C01-24C16, Microwire's 93C06 to 93C56, the current audio also uses SIP 25160, and Mirowire's 93C46 series is divided into standard and non-standard, two The main function is in the pin distribution, and its internal functions are basically the same. Must be carefully distinguished when using, otherwise there will be no data to read or write. It is also mistaken for chip damage. The main reason is that the car audio will use this kind of chip, and the European and American audio basically do not use this kind of "non-standard" chip. There is also a chip of S130 and S220, which correspond to 93C46 and 93C56 respectively. The 85C52 chip is often seen in European-made audio, usually in a chip package, and the appearance is wider than the general chip. It is basically the same as 24C02, but the write protection of pin 7 and the write protection pin of 24C02 are reversed, and 85C52 is high potential. In the older Mercedes-Benz audio can also be common to BAW574252, it is the same as 24C01, 24C01 some chips will appear can read and can not write data, then a new 24C01 or 24C02 can be replaced. The 24C02 is fully compatible with all 24C01 functions.
The chips used in liquid crystal meters are relatively more standardized. Most of them are Microwire. They are used from 93C46 to 93C86. There are basically no "non-standard" chips, and most of them use 16-bit structure. 16bit or 8bit, otherwise there will be high and low levels of reversed or even data errors, which is a special consideration for metering. In the new Mercedes-Benz, 24C04 and B58 chips are also common, and the B58 can be replaced with 93C56. However, when reading and writing data, the seventh pin must be set to a low potential. Older BMWs are often used with CS56 and CS66, and they must also set the seventh pin to a low potential. The domestically produced instruments also use SPI 25010 and X25043 (X5043), Shanghai Buick and the time-use ATMEL68343A, which is actually 25010. The S220 is also used on Toyota's 4700 Jeep, which is equivalent to the 93C56.
There are several types of body anti-theft chips in the public: 93C46, 93C56, 93C86, including 93C46 (8bit) for imported old Audi, 93C56 for old (8bit for old, 16bit for new), C5A6, PASSAT, BORA for 93C86 (16bit). ).
In addition, these chips are also used in airbag computers, gearbox computers, and remote door lock computers. In the case of a lot of unavoidable situations (such as gearbox locks, no original diagnostic computer), we can also perform maintenance work by directly reading and writing EEPROM data.
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