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UM2153

Board revision history and limitations

Appendix C

Board revision history and limitations

Table 12. Board revision history and limitations

Board

Version

Revision details

Known limitations

MB1297

Not available; engineering samples

only

MB1297

Not available; engineering samples

only

MB1297

C-01

First official IoT Discovery kit

version with following changes

compared to MB1297C

schematics:

– Capacitor value for NFC

matching changed (C53 = 10 pF

instead of 47 pF and C71 =

10 pF instead of 47 pF)

– STSAFE-A100 (U9 component)

not fitted on MB1297C

– Firmware revision inside the

Wi-Fi module must be:

C3.5.2.3.BETA9. The Wi-Fi

module maximum output power

is limited to 9 dBm to fulfill

FCC/IC/CE requirements.

– A limitation is present on the

MB1297C-01 board. The reset

connexion between STM32L4

and the ST-LINK MCU

(STM32F103) is not present

even if schematics are correct.

The software reset is available

so that the hardware missing

reset may not be necessary. If

the hardware reset is needed, a

simple workaround is available

by soldering an external wire

between the SB2 and SB8.

– Firmware revision inside the

Wi-Fi module must be:

C3.5.2.3.BETA9. The Wi-Fi

module maximum output power

is limited to 9 dBm to fulfill

FCC/IC/CE requirements.

MB1297

D-01

Second official IoT Discovery kit.

No BOM changes compared to the

MB1297 C-01 BOM, that is C53 =

10pF, C71 = 10pF and STSAFE-

A100 (U9 component) not fitted.

Two pcb changes compared to the

MB1297 C-01 pcb:

– The reset connexion between

STM32L4 and the ST-LINK MCU

(STM32F103) is implemented of

the MB1297 rev D

– The pcb below the Wi-Fi antenna

has been removed to have more

Wi-Fi radiated output power

Firmware revision inside the Wi-Fi

module must be: C3.5.2.3.BETA9.

The Wi-Fi module maximum

output power is then limited to 9

dBm to fulfill FCC/IC/CE

requirements.

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