TS3A24159: High current consume compared with SGM3005...

Please show the schematic, and where you measured the current.

Hi Peter,

As Clemens mentioned, please show a schematic of this application so we can provide a more robust response here. 

Thanks!

Alex

Dears,

The customer measures the current from the input power source. Therefore, 5uA is the total system consumption.

About the schematics, there is no design change but just replace SGM3005 with TS3A24159....

Is there any idea about the issue?

Thanks.

I have no idea how the SGM3005 schematic looks like.

One guess would be that a control input was left floating or has an invalid voltage.

Hi Peter,

Without the original schematic, it's difficult to examine what could be going on at a system level here. As Clemens mentioned, there could have been a floating pin or out of range voltage applied to a pin. Please share any additional information you may have so we can drive a root cause here. 

Thanks!

Alex

Hi Alex,

Below are the SGM3005 schematics and its function.

IR_TX / IR_RX: for IrDA UART

BT_TX / BT_RX: for BT module UART

GSM_TX / GSM_RX; for 4G module UART

BSL_TX / BSL_RX: for MCU BSL programming

Major function is UART switch between MCU and each module. 

the customer just change it to TS3A24159 only.

If the issue cannot be fixed, we cannot convince the customer to change to TI solution.

Please help.

Thanks.

These schematics are incomplete; they do not show what voltages are applied to the supply and I/O pins.

Hi Peter,

I should have been clearer, my apologies. Typically, when we review a schematic for potential root cause of excessive current consumption or any device swap, we want to see what signals are applied to the pins. Can you provide the signals applied to all pins here?

Thanks!

Alex

Hi Alex,

The customer uses TS3A24159 to switch UART between MCU and other modules due to the limited amount of UART interface of MCU.

They cannot provide complete schematics including modules but only can explain how to connect the switch and modules as I said before.

With such information, can you help to check what's the problem it is?

Thanks. 

Hey Peter,

It will be a bit difficult to debug this without a full schematic but we can still try here. Can we get waveforms of the I/O inputs and the control inputs with the supply present? Ideally of both the devices so we can compare?

Additionally, is it possible to run a test where the TS3A24159 is on its own power supply? I'd like to see the isolated current and voltage there. We're looking to see here if the excess current is coming from the mux specifically or if there may be some voltage droop happening or if something else is happening on a system level. 

Thanks,
Rami