Data Sheet

Compute Module 3+ Datasheet

fall

rise

DIGITAL

OUTPUT

Figure 3: Digital IO Characteristics

7 Power Supplies

The Compute Module 3+ has six separate supplies that must be present and powered at all times; you

cannot leave any of them unpowered, even if a speciﬁc interface or GPIO bank is unused. The six

supplies are as follows:

1. VBAT is used to power the BCM2837 processor core. It feeds the SMPS that generates the chip

core voltage.

2. 3V3 powers various BCM2837 PHYs, IO and the eMMC Flash.

3. 1V8 powers various BCM2837 PHYs, IO and SDRAM.

4. VDAC powers the composite (TV-out) DAC.

5. GPIO0-27 VREF powers the GPIO 0-27 IO bank.

6. GPIO28-45 VREF powers the GPIO 28-45 IO bank.

Supply Descripion Minimum Typical Maximum Unit

VBAT Core SMPS Supply 2.5 - 5.0 + 5% V

3V3 3V3 Supply Voltage 3.3 - 5% 3.3 3.3 + 5% V

1V8 1V8 Supply Voltage 1.8 - 5% 1.8 1.8 + 5% V

VDAC TV DAC Supply

2.5 - 5% 2.8 3.3 + 5% V

GPIO0-27 VDD GPIO0-27 I/O Supply Voltage 1.8 - 5% - 3.3 + 5% V

GPIO28-45 VDD GPIO28-45 I/O Supply Voltage 1.8 - 5% - 3.3 + 5% V

SDX VDD Primary SD/eMMC Supply Voltage 1.8 - 5% - 3.3 + 5% V

Requires a clean 2.5-2.8V supply if TV DAC is used, else connect to 3V3

Table 7: Power Supply Operating Ranges

13 Release 2