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Power levels and consumption

JP150PCB 1.3PCB 1.4Jan PřibyslavskýThis page does not apply to the product or PCB revision chosen in the header.

The module operates in one of five power levels. Each switches off progressively more; the control interface (UART and USB) answers at every level, including standby.

Level Power stage DSP Wi-Fi module Idle current at 36 V (PCB 1.3)
NORMAL Playing Running Powered 250 mA
PWRSTAGE_IDLE Muted Running Powered 120 mA
PWRSTAGE_OFF Muted, unpowered Running Powered 75 mA
SLEEP Muted, unpowered Stopped Powered 55 mA
STANDBY Muted, unpowered Stopped Unpowered 30 mA

The currents are typical measured values on PCB 1.3 with no audio playing. They depend on the DSP program, the Wi-Fi module's network activity and the Bluetooth connection state.

To be added

The idle currents of PCB 1.4 at 36 V, as a second column of the table.

Entering and leaving a level

Levels are entered from MuraLink or by command, by automatic power-down, or on PCB 1.4 by the 12 V trigger. SLEEP keeps the Wi-Fi module powered, so the module stays reachable on the network and wakes when you play to it; STANDBY is the only level that removes Wi-Fi power.

Returning from a level that removed power from the power stages takes several hundred milliseconds, because the power stages are re-initialised. Waking from SLEEP or STANDBY also restarts the DSP, which reloads its program from the boot memory: about 50 ms on PCB 1.4, 200 to 250 ms on PCB 1.3. Audio is back within about a second.

In STANDBY the host MCU keeps running and answering commands, which accounts for most of the remaining current.

Device > Power Modes: the Power mode row has a button per level (Normal, PS idle, PS off, Sleep, Standby); the current level is highlighted and a click switches at once. The automatic power-down and, on PCB 1.4, the 12 V trigger are set on the same page.

Device, Power Modes
Device > Power Modes: the power level, the automatic power-down and, on PCB 1.4, the 12 V trigger.

Over the control interface

SYS:POWER:MODE? answers the level and SYS:POWER:MODE with a level name of the table above sets it; the control interface answers at every level (SYS:POWER reference).