TCPP03-M20: The Promise of Twin-Position Energy USB-C Ports Lastly Fulfilled in New Functions

The TCPP03-M20 is ST’s first USB-C port safety machine for twin function energy (DRP) purposes, which means that it’ll serve programs designed as a supply (charger) or a sink (charging). In probably the most simplistic phrases, the element brings collectively the TCPP01-M12 (sink) and the TCPP02-M18 (supply) featured on the ST Weblog. For example, it contains their gate drivers to guard in opposition to over-voltage and over-current on the VBUS. Equally, the TCPP03-M20 embeds the identical present sensing factor because the TCPP02-M18 and an an identical discharge path on the VBUS and VCONN. Nevertheless, it additionally contains energy consumption states to assist engineers optimize the purposes which are clamoring for dual-role energy safety.

The Rise of Hybrid Functions

Why Twin-Position Ports Are a Flagship Characteristic?

Hybrid purposes, which combine charging an inner battery after which utilizing that battery to cost a cellular product like a smartphone, have gotten flagship options. For example, exterior batteries are getting smaller. Beforehand, makers would dedicate one port to cost the interior battery and one other to cost exterior merchandise. To avoid wasting area and enhance the consumer’s expertise, engineers now use a single dual-role port for each roles. Equally, producers are including USB-C ports to merchandise that beforehand didn’t have any. For example, batteries for energy instruments use dual-role energy ports to extend their enchantment. Shoppers can use the port to cost the interior battery and cost smartphones or tablets when within the area.

The place Did the Development Originate?

The brand new market tendencies appear to answer client calls for fairly than laws. Certainly, the TCPP01-M12 and TCPP02-M18 supply options to the distinctive challenges introduced by the European Union’s selections to harmonize charging ports. As merchandise all use USB-C, it’s crucial to guard in opposition to edge instances and poorly designed programs. But, the rise of dual-role energy purposes doesn’t come from European rules. As an alternative, producers are lastly implementing a long-standing promise of the USB-IF. Certainly, the Discussion board first launched the DRP as early as 2016 throughout a developer’s convention. Since then, the press has been selling this characteristic. Producers at the moment are capable of ship it to shoppers.

TCPP03-M20 and the Challenges of Twin-Position Energy Ports

Why Does Twin-Position Port Safety Wants Extra Energy?

Releasing hybrid purposes took time partly as a result of designing a system supporting sink and supply is hard. In essence, a USB-C port in a sink mode will use a pull-down resistor whereas a supply element will depend on a pull-up resistor, and a twin function connector will swap between the 2. Nevertheless, whereas the basics are easy, engineers face optimization challenges to create environment friendly programs. For example, designing a PCB with a big exterior USB-PD controller supporting DRP usually implies that the safety machine will usually draw greater than 15 µA when there’s no cable connected. Certainly, the safety machine have to be prepared for each a supply and a sink software till it could make a willpower.

How Does a Companion Chip Assist Enhance Effectivity?

The TCPP03-M20 presents new options to the facility consumption challenges as a result of it really works as a companion machine with the USB PD controller discovered inside STM32 microcontrollers. The embedded nature of the answer means fewer exterior parts and better coordination with the processor. For example, the safety machine can use a hibernate mode by default when no cable is connected. The I2C interface is energetic, permitting the microcontroller to ship instructions, however the safety machine doesn’t eat any energy. Certainly, our checks present an influence consumption of 0 µA, with out accounting for the dynamic present of the I2C interface.


Equally, the TCPP03-M20 features a low-power mode that calls for solely 3 µA in an unattached state at 1.8 V, and 10 µA at 3.3 V. In that energy mode, the element presents over-voltage safety however doesn’t permit for communication with the USB-C PD controller but. It’s thus a manner for engineers to extend effectivity whereas ready for consumer interactions. The system is able to obtain a cable and both undertake the sink or supply mode. Nevertheless, till the consumer initiates the interplay, the low-power mode will assure the bottom energy consumption potential.

Why Do Some New Sink Functions Need a Present Monitor?

USB-CDRP safety may also resolve issues nobody anticipated. Just lately, producers of communication programs for first responders expressed the will to make use of a present sensing mechanism with a USB-C sink machine. It may well assist enhance reliability and security when utilizing these merchandise in very harsh environments, as an example. Nevertheless, sink safety gadgets don’t supply present sensing. Subsequently, they deal with over-voltage safety and don’t embody the comparator essential. The TCPP03-M20 solves these points since it could work with sink gadgets and accommodates the identical present sensor because the TCPP02-M18. Engineers can, subsequently, supply new redundant protections with out including complexity or blowing up the invoice of supplies.

Methods to Get Began?

The easiest way to get began with a TCPP03-M20 is to seize the X-NUCLEO-DRP1M1. The board works with STM32 MCUs that embody a USB PD controller to create demos quickly. ST even licensed the answer as a 100 W DRP (USB-IF TID: 6408). Because of this, corporations reusing our schematics and our supply code present in X-CUBE-TCPP can certify their merchandise sooner. Utilizing the daughterboard and the software program enlargement package deal may also assist run energy modes demos on the NUCLEO-G071RB or a NUCLEO-G474RE.

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