TB-FMCL-MIPI Hardware User Manual
14
Rev.3.01
7. Board Power System
7.1. Power System Overview
Figure 7-1 shows the TB-FMCL-MIPI power supply structure. The card uses the 12 Volt, the 3.3 Volt, the
3.3V AUX, and the VADJ rails supplied on the FMC connector from the carrier card. There is one 1.2V
LDO regulator to generate the PHY core voltage (MC20901/MC20902), one 2.5V LDO regulator for the
PHY IOs, and one switching regulator to generate the MIPI VUSER voltage rail. VADJ can range from
1.65V to 3.3V and is used mainly for the GPIO and I2C voltage translators. There is no control of power
sequencing. The 12V and 3.3V rails are protected by 0.5Amp PTC resettable fuses. If either fuse trips
due to an overcurrent fault, remove power to the card and wait a minute for the fuse to cool. Remove the
condition causing the excess current and apply power. If the fuse trips again, remove power, wait for the
fuse to cool, remove the card from the carrier, and contact our sales personnel for repair.
FMC LPC
CONNECTOR
12V
0.5A PTC
3.3V
0.5A PTC
3.3V AUX
EEPROM
I2C I/O
EXPANDER
VADJ
Adjustable
Buck Switching
Regulator
GPIO
LEVEL
SHIFTERS
I2C
LEVEL
SHIFTERS
GPIO
LEVEL
SHIFTERS
VADJ
I2C
LEVEL
SHIFTERS
VUSER
3V3
2V5
VADJ
3V3
2V5
VADJ
VUSER
VUSER
LDO
Regulator
2V5
LDO
Regulator
1V2
1V5
1V8
2V5
3V3
VUSER
SELECTION
MIPI PORT 1
IO VOLTAGE
SELECTION
MIPI PORT A
MIPI PORT B
12V0
3V3_AUX
MIPI PORT 2
IO VOLTAGE
SELECTION
3V3
Figure 7-1 TB-FMCL-MIPI Power Structure
7.2. MIPI User Power Rail
The MIPI User power source connector power is supplied from a Texas Instruments TPS62150 switching
regulator. It provides four user selectable output voltages from 1.5V to 3.3V at a total current of 800mA,
or 400mA per MIPI port. The VUSER voltage does not necessarily need to reflect the MIPI IO logic
levels, however, it is available as one of the level shifter reference options. The VUSER selection
jumper is mapped as follows:
1
3.3V
2
3
4
5
6
7
8
1
2.5V
2
3
4
5
6
7
8
1
1.8V
2
3
4
5
6
7
8
1
1.5V
2
3
4
5
6
7
8
Figure 7-2 VUSER Jumper Select Positions
Note:
Positioning more than one shunt, or positioning a shunt in a position not described above could
result in permanent damage to the board.