TUSB211: whether we need the redriver TUSB211

Hi Frank,

Could you also describe the "switch node" in this system? What is the end equipment?  To best way to evaluate this case would be through simulation. In this case TUSB216 should be used and not TUSB211. In addition multiple TUSB216 will most likely needed to be used. I recommend  placing the redriver closest to the connectors to start. 

Hi Malik,

i have highlight the SW( switch node--75mm=3inch) on the table above( yesterday post), it's switch board. The EE is blade server. How many db our device can compensate?

Could you please also share why we need 216 not 211?

Thanks.

Hi Frank,

 TUSB216 should be used on the puck board. TUSB216 has greater re-driving capability on both the rising and failing edge of the eye. TUSB211 has less re-driving capability. TUSB216 also has more options when used in I2C mode for tuning with atypically transmission media. USB 2 redriver do not use "equalization" like USB 3 re-drivers, so there is no "strict" insertion loss (dB) that can be stated. Estimates in dB do not correlate well. The impedance profile and inductance play a bigger role in USB 2 signal integrity. I recommend modeling the design as closely as possible to get a better understanding of SI performance of the system. 

hi Malik,

Many thanks for your help. Can the customer use the schematic compatible solution for TUSB211 and TUSB216? We want to try the two devices at the same time.(For 211 is in their library). From previous reply, one device is ok here. Thanks.

Hi Frank,

Yes the schematic should be able to be re-sued with TUSB216. Please keep in mind that there some minor pin differences, see below for details.

• TUSB211 EQ ---> TUSB216 BOOST: Pin straps are slightly different between the two pins
• TUSB211 ENA_HS ---> TUSB216 RX_SEN/ENA_HS: RX_SEN can be pin strapped to help fine tune re-driving settings. See datasheet for recommend settings
• TUSB211 VREG --> TUSB216 CDP_ENZ: TUSB216 no longer requires 0.1-µF external capacitor. pin strap used for additional CDP functionality

Hi Malik,

We have finished the schematic below as your suggestions(please neglect the part number, the real part number is TUSB211). For the pin 9 whether we need to reserve the pull up and pull down resistor here?