User Manual

In the program memory, along with the Firmware Application, there is a bootloader that launches the Application at power-up.
Mounted on the MPSoC heatsink, there is a 12 V fan with a 4-pin header. It can automatically be controlled by the Platform MCU based
on the MPSoC temperature or set to the fixed full speed. This option is controlled by JP2 and is user-selectable.
Table 10.3.1: Fan jumper positions
Jumper JP2 “AUTO FAN” Fan Speed
Set Automatic
Not set Full
A Seiko TS621E lithium rechargeable battery provides power to the MPSoC Battery Power Domain (BPD) through the
VCC
()_PSBATT pin. It is connected in parallel with a 100 uF capacitor. The BPD includes the real-time clock with a dedicated crystal
oscillator and a
RAM () available for storing a secure configuration key. The capacitor alone can provide power for approx. 15 minutes
after main power is turned off. The battery will provide power after that.
The nominal voltage of the TS621E is 1.5 V and has a nominal capacity of 1.3 mAh. The Zynq UltraScale+ MPSoC Data Sheet: DC and
AC Switching Characteristics (ds925) lists the maximum I at 3.65 uA. Some leakage current exists through the charging diode, a
maximum of 100 nA. Therefore, the capacity of the fully-charged battery is enough for a minimum of: 1.3 mAh * 1000 uA / 1 mA / 3.75
uA = 347 hours = 14 days without main power. Whenever main power is turned on the battery will be re-charged.
The battery is removable and can be replaced only by a 1.5 V, 6.8 mm rechargeable lithium coin battery. Do not use non-rechargeable
batteries!
However, those prepared to void their warranty can physically remove the charging circuit by de-soldering D13 or R400. In this case any
battery, even a non-rechargeable one, that meets MPSoC voltage specs can be used.
10.2.2. Bootloader Section
10.3. Fan
10.4. Coin battery
CC_PSBATT