From 0e4678d86fa3f5025b0dc4abed17b39c40df8807 Mon Sep 17 00:00:00 2001 From: Phil Elwell <8911409+pelwell@users.noreply.github.com> Date: Tue, 21 Nov 2023 10:53:01 +0000 Subject: [PATCH 1/2] Document the lack of USB-PPS support --- .../asciidoc/computers/raspberry-pi-5/power-supply.adoc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/documentation/asciidoc/computers/raspberry-pi-5/power-supply.adoc b/documentation/asciidoc/computers/raspberry-pi-5/power-supply.adoc index 6e3a69c098..8321323ac8 100644 --- a/documentation/asciidoc/computers/raspberry-pi-5/power-supply.adoc +++ b/documentation/asciidoc/computers/raspberry-pi-5/power-supply.adoc @@ -14,7 +14,7 @@ While USB-PD capable phone chargers advertise greater than 15W of power, virtual .On-screen warning of under-voltage event image::images/firstboot-powerwarning.png[alt="On-screen warning of under-voltage event in Raspberry Pi OS",width="100%"] -For users who wish to drive high-power peripherals like hard drives and SSDs, while retaining margin for peak workloads, a USB-PD enabled power supply capable of supplying a 5A at +5V (25W) should be used. If the Raspberry Pi 5 firmware detects such a supply, it increases the USB current limit for peripherals to 1.6A, providing 5W of extra power for downstream USB devices, and 5W of extra onboard power budget. +For users who wish to drive high-power peripherals like hard drives and SSDs, while retaining margin for peak workloads, a USB-PD enabled power supply capable of supplying a 5A at +5V (25W) should be used. N.B. USB-PPS is not supported. If the Raspberry Pi 5 firmware detects a supported 5A-capable supply, it increases the USB current limit for peripherals to 1.6A, providing 5W of extra power for downstream USB devices, and 5W of extra onboard power budget. We recommend the official Raspberry Pi Power Supply, which has been designed to consistently provide +5V despite rapid fluctuations in current draw. Those fluctuations in demand are common and frequent when you’re using peripherals with the Raspberry Pi. Other power supplies — usually designed to provide consistent current for charging cellphones — don’t cope with power fluctuations all that well. The official supply also has an attached (captive) USB cable, which means that you don’t accidentally use a poor-quality or "dumb" cable, which can be an issue with other supplies. From 6e30cf3a31bf4371e863d3a31bb8324b8836536c Mon Sep 17 00:00:00 2001 From: Alasdair Allan Date: Tue, 21 Nov 2023 10:54:33 +0000 Subject: [PATCH 2/2] Switched out to use a NOTE block --- .../asciidoc/computers/raspberry-pi-5/power-supply.adoc | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/documentation/asciidoc/computers/raspberry-pi-5/power-supply.adoc b/documentation/asciidoc/computers/raspberry-pi-5/power-supply.adoc index 8321323ac8..cfd14c5920 100644 --- a/documentation/asciidoc/computers/raspberry-pi-5/power-supply.adoc +++ b/documentation/asciidoc/computers/raspberry-pi-5/power-supply.adoc @@ -14,7 +14,9 @@ While USB-PD capable phone chargers advertise greater than 15W of power, virtual .On-screen warning of under-voltage event image::images/firstboot-powerwarning.png[alt="On-screen warning of under-voltage event in Raspberry Pi OS",width="100%"] -For users who wish to drive high-power peripherals like hard drives and SSDs, while retaining margin for peak workloads, a USB-PD enabled power supply capable of supplying a 5A at +5V (25W) should be used. N.B. USB-PPS is not supported. If the Raspberry Pi 5 firmware detects a supported 5A-capable supply, it increases the USB current limit for peripherals to 1.6A, providing 5W of extra power for downstream USB devices, and 5W of extra onboard power budget. +For users who wish to drive high-power peripherals like hard drives and SSDs, while retaining margin for peak workloads, a USB-PD enabled power supply capable of supplying a 5A at +5V (25W) should be used. If the Raspberry Pi 5 firmware detects a supported 5A-capable supply, it increases the USB current limit for peripherals to 1.6A, providing 5W of extra power for downstream USB devices, and 5W of extra onboard power budget. + +NOTE: USB-PPS is not supported. We recommend the official Raspberry Pi Power Supply, which has been designed to consistently provide +5V despite rapid fluctuations in current draw. Those fluctuations in demand are common and frequent when you’re using peripherals with the Raspberry Pi. Other power supplies — usually designed to provide consistent current for charging cellphones — don’t cope with power fluctuations all that well. The official supply also has an attached (captive) USB cable, which means that you don’t accidentally use a poor-quality or "dumb" cable, which can be an issue with other supplies.