Antminer S9 - DC-PIC and DC-DC System; DC-PIC Module Functionality and Schematic; DC-DC Circuit Implementation

Operator Board Maintenance Instructions
Need to be aware of：An abnormally high voltage rise in the boost circuit can lead to the calculation board finally 6 Voltage domain. LDO
Damage，also easily lead to chip damage. While the boost voltage the exception is mostly U110 、 R812 、 R811 Oxidation-induced.
5 、 DC-PIC ： PIC16 (L) F1704 Composition As shown in figure 13 and Figure 14 ：
A device that stores the frequency information and voltage values of an operational board chip，It also allows control of the operational DC-DC Output voltage.
13、PIC Schematic diagram
14、
PIC
6 、 DC-DC Circuit ：由 LM27402SQ 与 CMOS 管 TPHR9003NL Composition Figure 15 below and Figure 16 is shown ：
15 、 DC-DC Schematic diagram
9
PIC is running, every minute, we need to control the heartbeat signal.，if
not, With heartbeat information, PIC will work for one minute and then
shut down.
PIC pin 1 is VDD 3.3V, 14 is GND, pins 9 and 10 are connected to the I2C
bus of the IO port to the control board, pins 5, 6, and 7 are PIC addresses;
pin 4 is PIC3 .3V; pin 8 is PIC.
FB output, control DC-DC voltage; 11 pin is EN signal of PIC output, control
DC-DC working status.
Figure 15