WB SH 3.5: Errata

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0350001: Insufficient peak current

Revision:

3.5


Description

In a small part of devices shipped before 10.06.2014, the power supply circuit incorrectly limits the output current.


Symptoms

  • The Board sometimes reboots when you boot right after initializing the USB hub
  • The Board reboots when GSM is running at a poor signal level.

How to fix

The current-setting resistor needs to be replaced. Contact technical support. See also 0350004

0350002: Intermittent shutdown leads to the impossibility of download

Revision:

3.5


Description

After a short (<1s) shutdown of the WB SH using the switch on the case, the device does not boot.


How to fix

-


Workarounds

Turn off the board for a few seconds, then turn back on.

Reason

Undocumented processor behavior.

0350003: Work with DMX512 is not supported

Revision:

3.5


Description

The built-in RS-485 ports cannot be set to 250 kBaud. This makes it impossible to work with DMX-512.


How to fix

Need to replace the crystal oscillator, and recompile Device Tree/en. Recommended value: 24MHz.


Workarounds

Use a USB-RS485 adapter.

For example: (http://ru.aliexpress.com/item/Free-Shipping-USB-to-RS485-485-Converter-Adapter-Support-Win7-XP-Vista-Linux-Mac-OS-WinCE5/1896086704.html , http://www.dx.com/ru/p/usb-to-rs485-module-black-221402?tc=RUB&gclid=COavlbDOgb8CFeHbcgodIjUAOg#.U6CSrv53TFU )

It is recommended to use adapters on the FT232RL chip and the like.

Delivery of fixed Wiren Board Smart Home is possible.


Reason

The wrong value of the crystal oscillator.

0350004: Insufficient peak current (2)

C11 capacitor placement in WB SH rev. 3.5 (0350004)

Revision:

3.5, S/N before 230


Description

In devices shipped before 20.06.2014 (serial numbers less than 230), the power supply circuit incorrectly limits the output current.


Symptoms

If GSM is active and the signal level is poor, it can be observed under certain conditions:

  • reboot the Board
  • disable and reconnect the Wi-Fi module
  • Ethernet shutdown


How to fix

Unsoldering capacitor C11 fixes the problem. See diagram.

0350005: Leads from GSM on prtctrl line

Revision:

3.5

Description

PRTCTRL lines (power management for USB devices) 
are susceptible to interference from the radiation of the GSM antenna.

At high output power GSM and is close to the antenna location, interference lead to short-term withdrawal power with USB devices.

Symptoms

If GSM is active and the signal level is poor, it can be observed under certain conditions:

  • disable and reconnect the Wi-Fi module
  • disconnect and reconnect external USB devices


How to fix

  • Change the location of the built-in GSM antenna in the housing
  • Take the built-in GSM antenna outside the case
  • Use external GSM antenna


= = 0350006: Board power supply problems =

Revision:

3.5

Description

Incorrect C5 capacitor value in a very small number of boards shipped before June 10, 2014.

Symptoms

There are problems with switching the Board on: the device turns on only after several switches of the on/off button.

How to fix

  • Change the capacitor C5 to the capacitor of capacity 1 µf (see figure)
C5 capacitor in WB SH rev. 3.5 (0350006)