3.1. Power Supply

Pin

Signal

Description

type

I/O

1-4

VDDIN

Module power supply input (observe DIMM socket contact current rating)

power

I

5-7

VDDIO

1.8V or 3.3V I/O power supply output This output can be used for the module side supply of level shifters or for peripherals which are operated at the VDDIO voltage level.

power

O

Module

Remark

TX27

VDDIO=1.8V

max. 900mA

TX51

max. 200mA

TXSD

max. 200mA

TX28S

VDDIO=3.3V

max. 20mA

TX25, TX28

max. 200mA

TX48, TX53

max. 900mA

TX6

max. 300mA

TX8M

max. 900mA

TXMP

max. 300mA

9-12

VDD33

+3.3V Power supply output

power

0

Module

Remark

TX27

max. 1A

TX51

TXSD

max. 200mA

TX25, TX28, TX48, TX53, TX6, TX8M, TXMP

VDDIO and VDD33 are connected on the module. Refer to ratings above.

18,26,32,39,50,58,71,82, 88,94,102,111,116,129, 142,147,160,171,200

GND

TX modules operates on a single supply and provide regulated power supply outputs to the baseboard.

../../../_images/power_supply.png

The use of level shifters on the baseboard to interface to 3.3V logic allows for universal module selection, because the voltage is automatically translated between VDDIO (1.8V or 3.3V) and VDD33 (3.3V) levels. Level shifters can be omitted on 3.3V only modules like the TX25, but in that case it’s not possible to use 1.8V modules anymore.