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ManualsBrandsMicrochip ManualsIntegrated Circuits (ICs)USB Hub Controller VQFN
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USB251xB/xBi
DS00001692C-page 26 2010 - 2015 Microchip Technology Inc.
5.1.15 REGISTER 0EH: HUB CONTROLLER MAX CURRENT FOR SELF-POWERED OPERATION
5.1.16 REGISTER 0FH: HUB CONTROLLER MAX CURRENT FOR BUS-POWERED OPERATION
5.1.17 REGISTER 10H: POWER-ON TIME
5.1.18 REGISTER 11H: LANGUAGE ID HIGH
5.1.19 REGISTER 12H: LANGUAGE ID LOW
5.1.20 REGISTER 13H: MANUFACTURER STRING LENGTH
Bit Number Bit Name Description
7:0 HC_MAX_C_SP Hub Controller Max Current Self-Powered: the value in 2 mA increments that
the hub consumes from an upstream port (VBUS) when operating as a self-
powered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board. This
value does NOT include the power consumption of a permanently attached
peripheral if the hub is configured as a compound device.
Note: The USB 2.0 Specification does not permit this value to exceed
100 mA
A value of 50 (decimal) indicates 100 mA, which is the default value.
Bit Number Bit Name Description
7:0 HC_MAX_C_BP Hub Controller Max Current Bus-Powered: the value in 2 mA increments that
the hub consumes from an upstream port (VBUS) when operating as a bus-
powered hub. This value will include the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
Note: This value will not include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
A value of 50 (decimal) would indicate 100 mA, which is the default value.
Bit Number Bit Name Description
7:0 POWER_ON_TIME Power-On Time: the length of time that it takes (in 2 ms intervals) from the
time the host initiated the power-on sequence on a port until the port has
adequate power.
Bit Number Bit Name Description
7:0 LANG_ID_H USB Language ID: upper 8 bits of a 16-bit ID field
Bit Number Bit Name Description
7:0 LANG_ID_L USB Language ID: lower 8 bits of a 16-bit ID field
Bit Number Bit Name Description
7:0 MFR_STR_LEN Manufacturer String Length: with a maximum string length of 31 characters
(when supported).