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I2C Hub 1 to 6 Expansion Unit (TCA9548A)

SKU:U040

Regular price $3.95
Standard Shipping Estimated Delivery Time: 7-20 days
Description

PaHUB, is a expander for I2C GROVE PORTA(red port on M5Core). 1-to-6. If you want connect mutiple I2C slave devices and some of them may sharing the same address, this unit can resolve I2C address conflicts.

At the Unit PaHUB's heart is an TCA9548A produced by TI. The TCA9548A device has eight bidirectional translating switches that can be controlled through the I2C bus. The SCL/SDA upstream pair fans out to downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can beselected, determined by the contents of the programmable control register.

Technically this Unit allows mutiple levels of nesting, for example you can wire PaHUBs to the root PaHUB to get more seats for your I2C slave devices, if you have 7 of them you can have up to 36 I2C GROVE ports, which makes it easier to get your project more organized.

The I2C address of this unit is 0x77 (changable by resistors).

Notice: Please pay attention to the channel order while programing 

Product Features

  • I2C GROVE PORTA Expander
  • Two Lego-compatible holes
  • Nested allowed
  • 1-To-6

Kit includes

  • 1x PaHUB Unit
  • 1x Grove Cable
Documents
More information

Schematic

Driver Protocol

  • Driver firmware -

  • Test code -

  • protovol type - I2C

  • address - 0x77

Customer Reviews

Based on 16 reviews
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J
J.C.A.
The Pa.Hub has some design flaw, the I2C 5V voltage drops under oraround 1V when plugged ....

The Pa.Hub (which is not a hub but a switch or a multiplexer using the proper telecom terms) is NOT USEFUL at all, as stated in the review title "The Pa.Hub has some design flaw, the I2C 5V voltage drops under oraround 1V when plugged ....(test with Core Fire and Stick-C)." ...that is the case just pluging in the Pa.Hub and/or when another Unit like the RFID Unit is plugged to the hub; here some of my test results (not all shown as system limits it to 2000 characters):
"A) Test with Sticc-C (Speaker HAT permanently connected to it, USB disconnected, Stick-C
on Wifi download mode waiting for download/ no user application runnning)
...
Test A.1C: Grove Hub connected to Stick-C + RFID connected to Hub + RFID tag in close proximity
Vcc-GND voltage (measured on Grove Hub I2C header pins 1 and 2: 5.024V

Test A.2A: Pa.Hub (switch/multiplexer) connected to Stick-C (nothing else connected to Hub)
Vcc-GND voltage (measured on Grove Hub I2C header pins 1 and 2: 5.024V

Test A.2B: Pa.Hub (switch/multiplexer) connected to Stick-C + RFID connected to Pa.Hub Port0 + NO RFID tag in proximity
Vcc-GND voltage (measured on Grove Hub I2C header pins 1 and 2: 0.888V

B) Test with Fire Core , USB disconnected, Core
on Wifi download mode waiting for download/ no user application runnning)

Test B.1A: Grove Hub connected to Core (nothing else connected to Hub)
Vcc-GND voltage (measured on Grove Hub I2C header pins 1 and 2: 5.020V

Test B.1B: Grove Hub connected to Core + RFID connected to Hub + NO RFID tag in proximity
Vcc-GND voltage (measured on Grove Hub I2C header pins 1 and 2: 5.02V

Test B.1C: Grove Hub connected to Core + RFID connected to Hub + RFID tag in close proximity
Vcc-GND voltage (measured on Grove Hub I2C header pins 1 and 2: 5.020V

Test B.2A: Pa.Hub (switch/multiplexer) connected to Core (nothing else connected to Hub)
Vcc-GND voltage (measured on Grove Hub I2C header pins 1 and 2: 1,282V (Core power-down after a while)"

Hey Juan, thanks for your thorough testings, we'll be back to work from 31st Jan, our engineer will take extra testing on your mentions.
E
E.P.

I2C Hub 1 to 6 Expansion TCA9548A Module

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L.G.

I2C Hub 1 to 6 Expansion TCA9548A Module

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B.H.

I2C Hub 1 to 6 Expansion TCA9548A Module

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S.L.

I2C Hub 1 to 6 Expansion TCA9548A Module