FTDI FT4232HP USB Devices with Type-C Power User Guide

: June 15, 2024
: FTDI

Table of Contents

FTDI FT4232HP USB Devices with Type-C Power
Introduction
Overview
Configuration Parameters
Power Role Swap Options
Contact Information
Appendix A – References
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

FTDI FT4232HP USB Devices with Type-C Power

Introduction

The FT4232HP/FT2232HP/FT232HP are high-speed USB devices with Type-C power delivery features. Within the power delivery functionality, there are multiple configurable options available, and this document describes all the configurable options. The configuration options covered in this document only cover the power delivery configuration. For USB configurations, please refer to AN 124 User Guide For FTDI FT_Prog Utility.

Overview

This document describes each configurable option and the configurable values of each parameter in the EEPROM of the FT4232HP/FT2232HP/FT232HP. The EEPROM is external, and it is needed only if the design needs a custom configuration. If the default configuration is sufficient then there is no need to have an external EEPROM. For default values, please refer to the sections below.

Glossary of Terms

SI. No.	Term	Description

1

| ****

Sink / Consumer

| When the device is consuming power from the

host port, the device is said to be in “Sink” mode, or the device is said to be a “consumer”.

2

| ****

Source / Provider

| When the device is supplying power to the host, then the device is operating in “Source” mode.

The device can change the role from Sink to Source if the device is self- powered and power role swap is enabled in the configuration.

3

| ****

Power Role Swap

| The process of changing the role is called role swap. The device can switch the role from Sink to Source if the device is

self-powered.

Configuration Parameters

256 bytes in the configuration EEPROM are reserved for configuration options. Table 1 gives the information for all the configurable options.

Parameter	Description	Default value	Configurable values

Sink Request Power Role Swap

| Sink will initiate a PR SWAP request only if this option is set.

Default settings do not support PR SWAP. However, if the device is self- powered, then PR SWAP can be supported by modifying the

configurations.

|

0 – Disabled.

|

0 – Disabled.

1 – Enabled.

Sink Accept PR Swap

| Option to accept PR SWAP when FT4232HP

/FT2232HP/FT232HP is a sink.

If this option is not set, the PR_SWAP request from a source will be rejected

|

0 – Reject.

|

0 – Reject.

1 – Accept.

Source Request PR SWAP

| When the device is a Source, this option is used to decide whether to swap back to sink

when it sees a port2 disconnect event.

|

0 – Disabled.

|

0 – Disabled.

1 – Enabled.

Source Accept PR SWAP

| When the device is a source, a PR_SWAP request from the sink can be accepted or rejected

based on this option.

|

0 – Reject.

|

0 – Reject.

1 – Accept.

UConn Swap| Option to enable UConn swap support.| 0 – Reject| 0 – Reject

1 – Accept

External MCU| This is to switch over to external MCU mode.| 0 – Internal MCU.| 0 – Internal MCU. 1 – External MCU.

PD Auto Clock

| Auto clock enable/disable. The auto clock feature is explained in section 2.4.|

0 – Disabled.

| 0 – Disabled.

1 – Enabled.

Use EFUSE

| This option indicates whether to use trim values from EFUSE or not. Keep this enabled always. The configurable option is provided for characterization purposes only.|

1 – Use EFUSE.

|

0 – Do not use EFUSE TRIM. 1 – Use EFUSE TRIM

GPIO Count

| PD Source uses GPIOs to control the power supplies. This option indicates how many GPIOs are used for power supply control.|

0

|

0 – 3

GPIO Number1

|

GPIO number for power supply control. GPIO can also be used as an ISET in case of sink-only configuration.

|

‘NA’

| The following options are available as a dropdown list in FT_PROG.

Values 0 – 3,

A Text ‘NA’.

Select the appropriate GPIO value for this

Parameter	Description	Default value	Configurable values
		option. And if this field is unused,

then select ‘NA’.

GPIO Number2

|

GPIO number for power supply control. GPIO can also be used as an ISET in case of sink-only configuration.

|

‘NA’

| The following options are available as a dropdown list in FT_PROG.

Values 0 – 3,

A Text ‘NA’.

Select the appropriate GPIO value for this option. If this field is unused,

then select ‘NA’.

GPIO Number3

|

GPIO number for power supply control. GPIO can also be used as an ISET in case of sink-only configuration.

|

‘NA’

| The following options are available as a dropdown list in FT_PROG.

Values 0 – 3,

A Text ‘NA’.

Select the appropriate GPIO value for this option. And if this field is unused,

then select ‘NA’.

GPIO Number4

|

GPIO number for power supply control. GPIO can also be used as an ISET in case of sink-only configuration.

|

‘NA’

| The following options are available as a dropdown list in FT_PROG.

Values 0 – 3,

A Text ‘NA’.

Select the appropriate GPIO value for this option. And if this field is unused, then select ‘NA’.

PD Load Enable

|

GPIO number configured with load enable switch for PD

|

2

| The following options are available as a dropdown list in FT_PROG.

Values 0 – 3,

A Text ‘NA’.

Select the appropriate GPIO value for this option. And if this field is unused,

then select ‘NA’.

Parameter	Description	Default value	Configurable values

Discharge Pin

|

GPIO to enable the discharge circuit

|

‘NA’

|

(Should not be same as any of the GPIO Number1 to Number4 value). The following options are available as a dropdown list in FT_PROG.

Values 0 – 3,

A Text ‘NA’.

Select the appropriate GPIO value for this option. And if this field is unused,

then select ‘NA’.

Discharge Enable BM

|

GPIO bitmap to enable the discharge circuit

|

1 – drive high

| The following options are available in the dropdown list of FT_PROG.

Drive Low Drive Hi Input Mode.

Don’t Care.

Discharge Disable BM

|

GPIO bitmap to disable the discharge circuit

|

0 – drive low

| The following options are available in the dropdown list of FT_PROG.

Drive Low Drive Hi Input Mode.

Don’t Care.

CC Indication

|

Option to indicate CC Orientation through a GPIO

|

Not Selected in Default Configuration

| (Should not be same as any of the GPIO Number1 to Number7 value). The following options are available as a dropdown list in FT_PROG.

Values 0 – 3,

A Text ‘NA’.

Select the appropriate GPIO value for this option. And if this field is unused,

then select ‘NA’.

ISET1

| GPIO Number. The state of the GPIO is used to indicate which sink profile is used.

ISET1 is to indicate the case non-PD TYPEC_1.5A

attachment.

|

1

| Any GPIO number based on the board design can be used. Any GPIO value 0 – 3 can be used as

long as these pins

Parameter	Description	Default value	Configurable values
		are not used for any other purpose. If the PCB design supports PD

Source, then do not use the pins

reserved for the source as ISET.

ISET2

|

GPIO Number. The state of the GPIO is used to indicate which sink profile is used.

ISET2 is to indicate the case non-PD TYPEC_3A

attachment.

|

3

| Any GPIO number based on the board design can be used. Any GPIO value 0 – 3 can be used as long as these pins are not used for any other purpose.

If the PCB design supports PD Source, then do not use the pins reserved for source

as ISET.

ISET3

|

GPIO Number. The state of the GPIO is used to indicate which sink profile is used.

ISET3 is to indicate PD profile 1 (5V3A).

|

3

| Any GPIO number based on the board design can be used. Any GPIO value 0 – 3 can be used as long as these pins are not used for any other purpose.

If the PCB design supports PD Source, then do not use the pins

reserved for the source as ISET.

ISET_ENABLED

|

bit to enable/disable the ISET feature/

|

1

| 0 – Disable the ISET feature.

All the above ISET fields will be ignored.

1 – ISET Enabled.

GPIO_BM_PDO1(vSafe5v)

| There are two cases for 5V. They are typically the same however, in case there is a difference, this option is for PDO_1.

1. 5V after PD contract

negotiation.

2. vSafe5V during PR_SWAP before negotiating high

power.

In case the GPIO mapping for these two is not the same, then please use the mapping for

case 2 using the vSafe5V

|

‘Don’t Care’

|

For each GPIO, the following options are available as a dropdown list in FT_PROG.

Drive High Drive Low. Input Mode. Don’t Care.

Parameter	Description	Default value	Configurable values
option (another option available).

GPIO_BM_PDO2

|

GPIO Bitmap for PDO2

|

‘Don’t Care’

| Drive High Drive Low Input Mode.

Don’t Care.

GPIO_BM_PDO3

|

GPIO Bitmap for PDO3

|

‘Don’t Care’

| Drive High Drive Low. Input Mode. Don’t Care.

GPIO_BM_PDO4

|

GPIO Bitmap for PDO4

|

‘Don’t Care’

| Drive High Drive Low. Input Mode.

Don’t Care.

vSet0V

| Settings to set 0V (Turn off all supplies)| ‘Don’t Care’| Drive High Drive Low

Don’t Care.

vSafe5V

| vSafe5V – used in case vSafe5V is not same as the 5V at PDO1. (can be different power – as vSafe5V is before negotiation)|

‘Don’t Care’

|

Drive High Drive Low Don’t Care.

Sink PDO1

|

Voltage and current profile for PDO1. Typically, PDO1 is vSafe5.

| Voltage in 1mv Unit – 5000 (5v).

Current in 1ma Unit –

3000 (3A)

|

Voltage – 5000 (5V)

Current – (0-5000) (0-5A)

Sink PDO2

|

Voltage and current profile for PDO2.

|

0

| 0 Means this profile is not used.

The user is allowed to configure the profile to any valid voltage / current value without conflict.

A valid profile is a unique profile (The same voltage profile as another PDO is not allowed – Also the profiles should be in the descending order of

voltage).

Sink PDO3| Voltage and current profile for PDO3.| 0| Same as above.
Sink PDO4| Voltage and current profile for PDO4.| 0| Same as above.
Sink PDO5| Voltage and current profile for PDO5.| 0| Same as above.
Sink PDO6| Voltage and current profile for PDO6.| 0| Same as above.
Sink PDO7| Voltage and current profile for PDO7.| 0| Same as above.
Parameter| Description| Default value| Configurable values
---|---|---|---

Source PDO1

|

Voltage and current profile for PDO1. Typically, PDO1 is vSafe5.

Default Setting does not have source capability.

| Voltage in 1mv Unit – 5000 (5v).

And in 50mV Steps.

Current in 1ma Unit – 300 (3A),

10mA Steps.

|

Voltage – 5000 (5V)

Current – (0-5000) (0-5A)

Source PDO2

|

Default Setting does not have source capability.

| Voltage in 50mv Unit – 0.

Current in 10ma Unit –

0

|

Source PDO3

|

Default Setting does not have source capability.

| Voltage in 50mv Unit – 0.

Current in 10ma Unit –

0

|

Source PDO4

|

Default Setting does not have source capability.

| Voltage in 50mv Unit – 0.

Current in 10ma Unit –

0

|

Sender Response Timer

|

tSenderResponse timer in the PD Spec Rev3.0.

| 27ms (all the timer values are in milli-

seconds)

|

Any Value within Spec.

Sink Activity Timer

| tSinkActivity timer in the PD Spec. However, this timer is not used as it is not required in type-c 1.2+.|

135ms

|

Any Value within Spec.

Sink Request Timer| tSinkRequest timer in the PD Spec.| 110ms| Any Value within Spec.

Discharge Timer

| An internal timer is used to keep the discharge circuit on. During PR_SWAP and also during the Source Voltage transition, the discharge circuit|

100ms

|

Any value is based on the discharge circuit design.

Parameter	Description	Default value	Configurable values
will be turned on for the

duration mentioned in this timer.

TRIM1

| Do not use this in production.

Set to 0.

|

0

|

TRIM2

|

Do not use this in Production.

Set to 0.

|

0

|

External DC

| This option indicates the device is self-powered and has a fixed External power supply. FT4232HP/FT2232HP/FT232H

P does not support power role swap in its default settings as the role swap feature needs a power supply. So, if the device is externally powered, then power role swap can be supported. Use this option to indicate an externally powered

device.

|

UNCHECK

|

CHECKBOX

Power Role Swap Options

There are four different combinations for power role swap. These are the four configurable options available.

Sink Request Power Role (PR) Swap
When this option is set, the sink initiates a power role swap request if the device is self-powered. The “External DC” option indicates if the device is self-powered.
Sink Accept PR Swap
In case the device receives a PR_SWAP request from the source, the sink can either reject it or accept it based on this option. This option should be set only if the device is externally powered through a DC power supply.
Source Request PR SWAP
This option does not apply to single-port devices.
Source Accept PR SWAP
Similar to the above case, the device (source) can go back to the sink if the present sink requests a PR_SWAP. Whether to accept the request or not is based on this option.

vConn Swap
When this option is set, the device will do a vConn Swap every time it changes the power role.

External MCU

By default, the Internal MCU will be active. If the design is using an external MCU instead of an FT4232HP internal MCU, the customer needs to indicate this through a bit in the configuration. Select the “External MCU” Option to enable external MCU. Once this bit is set, the internal MCU won’t be active.
If the design does not have an EEPROM and still needs an External MCU, then both GPIO_0 and GPIO_1 of FT4232HP can be pulled high to achieve this. This has the same behavior as setting the External MCU bit.

PD Auto Clock
To aid in power saving, the clock can be turned off to the PD device when there is no activity. With the auto clock option enabled, the clock will turn on whenever there is any activity to the PD device and will turn off after the activity.

Use EFUSE
The PD device has an internal EFUSE block, and its size is 64 bits. This EFUSE is programmed during the IC characterization time, and it is one-time programmable. The value programmed in this block is used by the software to program bandgap voltage, pull-up current, pull-down resistance, etc. The “Use EFUSE” option is enabled by default. The software uses the EFUSE value only if this option is enabled. For debugging purposes this option can be disabled but not recommended to disable it for production.

GPIO Count

By default, FT4232HP/FT2232HP/FT232HP does not support power role swap and source operation. However, if the device is self-powered then it is possible to do a role swap. When the device is a source, it uses GPIOs to manage the power supplies. There can be multiple GPIOs to control multiple power sources (5V, 9V, 15V etc.). The total number of GPIOs used to control the power supplies should be defined in this field.
FT4232HP/FT2232HP/FT232HP has a total of 4 GPIO Pins. So, the valid value for this field is 0 to 3. When the FT4232HP/FT2232HP/FT232HP is configured as a sink-only device, set this field to 0. Since the number of GPIOs available is only 4, the maximum profiles that can be supported are only 4.

GPIO Number1 – 4
This field represents the GPIO pins used for controlling the power supply. In case there are three GPIO pins used, then GPIO Number 1 to GPIO Number 3 will indicate those three pins.

PD Load Enable

GPIO Pin is used to enable the PD load.

Discharge Pin

This indicates the GPIO Pin used for enabling and disabling the discharge circuit.

Discharge Enable BM

A 2-bit bitmap indicates how to enable the discharge circuit.
This can be one of the following values. FT_PROG gives these options as a dropdown list and hence the user does not need to know the bitmap.

Drive High
Drive Low
Input Mode.
Don’t Care (This means, this pin is not used).

Discharge Disable BM
A 2-bit bitmap indicates how to disable the discharge circuit.
This can be one of the following values. FT_PROG gives these options as a dropdown list and hence the user does not need to know the bitmap.

Drive High
Drive Low
Input Mode.
Don’t Care (This means, this pin is not used).

ISET

There are three ISET options by default. ISET1, ISET2 and ISET3.
These pins are used to indicate the power profile being used when the device is a sink. Even though there are 3 ISET options by default, the ISET feature for legacy cable has been disabled. That is, TYPE-C 1.5A (ISET1) and TYPE-C 3A (ISET2) feature has been disabled and hence only ISET3 (PD MODE) can be used.
These are the GPIO pins.
ISET1 – Type-C 1.5A Attached. (No PD) The feature has been disabled currently.
ISET2 – Type-C 3A Attached – 5V3A. (No PD) The feature has been disabled currently.
ISET3 – PD. 5V, 3A profile.
In case more than three ISETs are needed, it is possible to configure more than three if the device is used in a sink-only configuration. In sink-only configuration, GPIOs reserved for source power supply control are not needed hence those pins can be used as ISETs.
To do this, set the option “EXTEND_ISET” (described in the below sections).

ISET_ENABLED
All the ISET-related fields are valid only if this field is enabled. Instead of changing multiple ISET fields, this single enable/disable option helps to enable/disable the ISET feature.

GPIO_BM_PDO1 (vSafe5v)

GPIO Bitmap to select Source PDO1. The bitmap indicates the combination of the GPIO state used to get the selected profile.
For example, for PD01, GPIO0 – Drive Hi, GPIO1 – Drive Hi, GPIO2 – Don’t Care (NA).
These options are available as a table in FT_PROG and the states of the GPIO as a dropdown list.

GPIO_BM_PDO2

GPIO Bitmap to select Source PDO2. The bitmap indicates the combination of the GPIO state used to get the selected profile.
For example, GPIO0– Drive Hi, GPIO1 – Drive Hi, GPIO2 – Don’t Care (NA).
These options are available as a table in FT_PROG and the states of the GPIO as a dropdown list.

GPIO_BM_PDO3

GPIO Bitmap to select Source PDO3. The bitmap indicates the combination of the GPIO state used to get the selected profile.
For example, GPIO0 – Drive Hi, GPIO1 – Drive Hi, GPIO2 – Don’t Care (NA).
These options are available as a table in FT_PROG and the states of the GPIO as a dropdown list.

GPIO_BM_PDO4

GPIO Bitmap to select Source PDO4. The bitmap indicates the combination of the GPIO state used to get the selected profile.
For example, GPIO0 – Drive Hi, GPIO1 – Drive Hi, GPIO2 – Don’t Care (NA).
These options are available as a table in FT_PROG and the states of the GPIO as a dropdown list.

vSet0V

GPIO Bitmap to set 0V. The bitmap indicates the combination of the GPIO state used to get the selected profile.
For example, GPIO0 – Drive Low, GPIO1 – Drive Low, GPIO2 – Don’t Care (NA).
These options are available as a table in FT_PROG and the states of the GPIO as a dropdown list.

vSafe5V

GPIO Bitmap to select vSafe5. This can be the same as PDO1 too. The bitmap indicates the combination of the GPIO state used to get the selected profile.
For example, GPIO0 – Drive Hi, GPIO1 – Drive Hi, GPIO2 – Don’t Care (NA).
These options are available as a table in FT_PROG and the states of the GPIO as a dropdown list.

Sink PDO [1:7]

Option to select Voltage and Current Profile for Sink PDO1.
Corresponding to every PDO option, there is a voltage dropdown box and a current dropdown box in FT_PROG. Please select the voltage and current from this list for the PDO.
The lowest voltage profile should be PDO1 and the second lowest should be PDO2 and so on. The PDO profile should be in ascending order to the voltage.

Source PDO [1:4]

Option to select Voltage and Current Profile for Source PDO1.
Corresponding to every PDO option, there is a voltage dropdown box and a current dropdown box in FT_PROG. Please select the voltage and current from this list for the PDO.
The lowest voltage profile should be PDO1 and the second lowest should be PDO2 and so on. Basically, the PDO profile should be in ascending order to the voltage.

Sender Response Timer
This option is to configure the tSenderResponse timer. Please refer to the PD spec for tSenderResponse timer details. Timer units are in milliseconds.

Hard Reset Timer
This option is to configure the tPSHardReset timer. Please refer to the PD spec for tPSHardReset timer details. Timer units are in milliseconds.

Source Capability Timer
This option is to configure the tTypeCSendSourceCap timer. Please refer to PD Spec for more details on the tTypeCSendSourceCap timer. Timer units are in milliseconds.

Discover Identity Timer
This option is to configure the tDiscoverIdentity timer. Please refer to the PD Spec for more details on the dDiscoverIdentity timer. Timer units are in milliseconds.

Source Recover Timer
This option is to configure the tSrcRecover timer. Please refer to the PD Spec for more details on the tSrcRecover timer. Timer units are in milliseconds.

Transition Timer
This option is to configure the transition timer. Please refer to the PD Spec for more details on the transition timer. Timer units are in milliseconds.

Source off timer
This option is to configure the tPSSourceOff timer. Please refer to the PD Spec for more details on the tPSSourceOff timer. Timer units are in milliseconds.

No Response Timer
This option is to configure the tNoResponse timer. Please refer to the PD Spec for more details on tNoResponse. Timer units are in milliseconds.

Sink Wait Capability Timer
This option is to configure the tTypeCSinkWaitCap timer. Please refer to the PD Spec for more details on the tTypeCSinkWaitCap timer. Timer units are in milliseconds.

Sink Request Timer
This option is to configure the tSinkRequest timer. Please refer to the PD Spec for more details on tSinkRequest timer. Timer units are in milliseconds.

Discharge Timer
The internal timer is used to keep the discharge circuit enabled. The discharge circuit will be enabled and kept enabled for the timer duration. Timer units are in milliseconds.

Chunk Not Supported Timer
This option is to configure the tChunkingNotSupported timer. Please refer to the PD Spec for more details on tChunkingNotSupported timer. Timer units are in milliseconds.

I2C Address
This is used in the case of an external MCU. The I2C address will default to 0x20 if this is not specified.

TRIM1
For Debug purposes only – Usually, the TRIM values are taken from EFUSE. However, EFUSE can be overridden using this field.

TRIM2
For Debug purposes only – Usually, the TRIM values are taken from EFUSE. However, EFUSE can be overridden using this field.

External DC
If the device is self-powered, then this option can be set to initiate a power role swap request to switch over the role to the source. The Sink Request power role swap option also should be set along with this to achieve this.

Contact Information

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Web Site

http://ftdichip.com

Distributor and Sales Representatives
Please visit the Sales Network page of the FTDI website for the contact details of our distributor(s) and sales representative(s) in your country.

System and equipment manufacturers and designers are responsible for ensuring that their systems, and any Future Technology Devices International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory, and system-level performance requirements. All application-related information in this document (including application descriptions, suggested FTDI devices, and other materials) is provided for reference only. While FTDI has taken care to ensure it is accurate, this information is subject to customer confirmation, and FTDI disclaims all liability for system designs and any application assistance provided by FTDI. Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the user agrees to defend, indemnify, and hold harmless FTDI from all damages, claims, suits, or expense resulting from such use. This document is subject to change without notice. No freedom to use patents or other intellectual property rights is implied by the publication of this document. Neither the whole nor any part of the information contained in, or the product described in this document, may be adapted, or reproduced in any material or electronic form without the prior written consent of the copyright holder. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park, Glasgow G41 1HH, United Kingdom. Scotland Registered Company Number: SC136640

Appendix A – References

Document References

https://usb.org/sites/default/files/USB%20Power%20Delivery_1.zipFT_PROG
AN 124 User Guide For FTDI FT_Prog Utility
USB High-Speed Series ICs

Acronyms and Abbreviations

Terms	Description
BM	Bit Map
BOS	Binary Object Store
GPIO	General Purpose Input Output
PD	Power Delivery
PDO	Power Delivery Object
PR SWAP	Power Role Swap.
USB	Universal Serial Bus
USB-IF	USB Implementers Forum

Appendix B – List of Tables and Figures
List of Tables
Table 1 – Configuration Parameters …………………………………………………………………………. 11
List of Figures
NA

Appendix C – Revision History