What types of chips are on the V4.21 version of the S9 hash board?

We introduced the V3.76 version S9 hash board chips in the last article. Today we will introduce the V4.21 version of the S9 hash board in detail. There are slight differences between the two, but there are also many similarities, let's take a look!

BM1387B ASIC chip

A single S9 hash board has a total of 63 BM1387B ASIC chips, which are located under the heat sink and are connected to it by thermosetting adhesives, which are mainly responsible for the hash rate calculation of the whole miner.

U1: UP1542S

The UP1542SSU8 is a compact synchronous rectifier buck controller designed to operate from a 5V or 12V supply voltage and provide a high-quality output voltage down to 0.6V for linear OCPs. Housed in a PSOP-8L package, the part features internal soft-start, over/under-voltage protection, over-current protection, and shutdown functions.

Q4: QN3109

The QN3109 is the highest performance trench N-channel buck converter with extremely high cell density. It provides excellent RDSON and gate charge for most synchronous buck converter applications; its advanced high cell density Trench technology is ideal for hash board repairs.

U3: PIC16F1704

The PIC16F1704 is an 8-bit microcontroller processor that combines intelligent analog integration with low cost and very low power consumption, mainly used to maintain hash boards. The operating temperature of this chip is between -40°C and 85°C.

U88: CT1R

CT1R and CT1F can be used in common use. It is a dual-power bus transceiver chip IC with 6-pin SOT23-6 package technology. The operating voltage is between 1.65V and 5.5V.

U89: T451

The T451 temperature sensor chip adopts WSON-8 packaging technology and is mainly used to sense the temperature of the hash board. If the temperature sensor chip is damaged, it will cause abnormal temperature readings. If the temperature of the temperature sensor chip is too low, the hash board will not start, or if the temperature is too high, the miner will stop running.

U78: M4JD

According to the analysis of the maintenance personnel, the hash board can normally work by replacing the faulty M4JD chip with the normal working 4VK4. Therefore, we can speculate that M4JD and 4VK4 have the same function. They are both voltage regulators. The output voltage is between 1.0V and 5.0V, and the maximum output current is 300mA.

U7: D8M7KW

Antminer S9 hash board chip summary: