Power input

Applicable receivers:  BD940 | BD940-INS | BX940

The unit, excluding the antenna operates at 3.3 V +5%/-3%. The 3.3 V should be able to supply 1.8 A of worst-case surge current. Full-load power consumption including antenna is 2.7 W.

BD940 evaluation board

Over-voltage protection

The absolute maximum voltage is 3.6 V.

Under-voltage protection

The absolute minimum voltage is 3.2 V below nominal.

Reverse voltage protection

The unit is protected down to -3.6 V.

Power On reset (PORESET)

There is a PORESET controller that monitors the power rails. The PORESET signal will be low if Maxwell Core, CPU Core, and CPU 1.8 V are not correct. The signal will stay low for 200 mSec after all of these rails are good. If any of the rails drop, PORESET will be toggled. PORESET is connected to a hardware reset on the CPU.

I/O READY

For the BD940 module integration, avoid back-powering the module by waiting for the I/O_READY (pin 74) to go high before any connected I/O devices are powered.