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Ligne 46 :
Ligne 46 : + − VSW supplies power to a 5 V regulator, whose output is designated '''VREG'''. The battery voltage is regulated to 5 V by an MP4423H switching buck converter; although the regulator itself works with input voltages up to 36 V, the motor drivers limit the control board’s maximum input voltage to 10.8 V. When available, VREG is generally used to supply logic power for the ATmega32U4, motor drivers, and encoders. The rest of the regulator’s achievable output current, which depends on input voltage and ambient conditions, can be used to power other devices; this can include an attached Raspberry Pi (which typically draws a few hundred milliamps). Under typical conditions, up to 2 A of current is available from the VREG output. (We also make a standalone regulator {{polpl|2858}} based on this integrated circuit.)+ − The MP4423H regulator features an open-drain power good output, '''PG''', which requires an external pull-up. PG drives low when the 5 V regulator’s output voltage falls below around 85% of the nominal voltage and becomes high-impedance when the output voltage rises above around 90%. The regulator circuit on the Romi 32U4 Control Board can be disabled by driving the regulator shutdown pin, '''REGSHDN''', high; this will cause 5 V logic power for the control board to be sourced from USB instead if it is available.+
Pololu-Romi-32U4-Carte-Alimentation (voir la source)
Version du 17 juillet 2019 à 22:57
, 17 juillet 2019 à 22:57→Régulateurs 5V et 3.3V
== Régulateurs 5V et 3.3V ==
== Régulateurs 5V et 3.3V ==
La connexion VSW fourni l'alimentation au régulateur 5 V, dont la sortie est désignée par '''VREG'''. La tension des piles est régulée vers 5 V par un régulateur MP4423H (hacheur de type buck). Même si le régulateur accepte une tension jusqu'à 36 V, le contrôleur moteur accepte une tension maximale de 10.8 V. Lorsque disponible, VREG est généralement utilisé pour alimenter l'ATmega32U4, contrôleur moteur et les encodeurs. Le restant du courant disponible sur le régulateur, qui dépends de la tension d'entrée et conditions ambiantes, peut être utilisé pour alimenter d'autres périphériques; cela peut inclure un Raspberry Pi branché sur la carte (consommant généraleent quelques centaines de milliampères).
Dans les conditions normales, un courant allant jusque 2 A peut être disponible sur la sortie VREG. (Ce régulateur {{polpl|2858}} Pololu est également disponible sous la forme d'un circuit intégré.)
Le régulateur MP4423H {{traduction}} regulator features an open-drain power good output, '''PG''', which requires an external pull-up. PG drives low when the 5 V regulator’s output voltage falls below around 85% of the nominal voltage and becomes high-impedance when the output voltage rises above around 90%. The regulator circuit on the Romi 32U4 Control Board can be disabled by driving the regulator shutdown pin, '''REGSHDN''', high; this will cause 5 V logic power for the control board to be sourced from USB instead if it is available.
The Romi 32U4 Control Board also contains a 3.3 V LDO that draws its power from the output of the logic power selection circuit described below. The output of the 3.3 V regulator is designated '''3V3''' and is used to supply the on-board inertial sensors and level shifters.
The Romi 32U4 Control Board also contains a 3.3 V LDO that draws its power from the output of the logic power selection circuit described below. The output of the 3.3 V regulator is designated '''3V3''' and is used to supply the on-board inertial sensors and level shifters.