2013 - 2015 Microchip Technology Inc. DS00001726B-page 31
USB2422
4.4.25 SERIAL STRING REGISTERS (SERSTR)
4.4.26 BATTERY CHARGING ENABLE REGISTER (BC_EN)
4.4.27 BOOST UPSTREAM REGISTER (BOOSTUP)
Address: 92h-CFh Size: 8 bits
Bits Description Type Default
7:0 Serial String (SER_STR)
UNICODE UTF-16LE per USB 2.0 Specification.
Maximum string length is 31 characters (62 Bytes).
Note: The String consists of individual 16 Bit UNICODE UTF-16LE
characters. The Characters will be stored starting with the LSB at
the least significant address and the MSB at the next 8-bit location
(subsequent characters must be stored in sequential contiguous
address in the same LSB, MSB manner).
R/W 00h
Address: D0h Size: 8 bits
Bits Description Type Default
7:0 Battery Charging Enable (BC_EN)
Enables the battery charging feature for the corresponding port.
0 = Battery Charging support is not enabled
1 = Battery charging support is enabled
Bit 7= Reserved
Bit 6= Reserved
Bit 5= Reserved
Bit 4= Reserved
Bit 3= Reserved
Bit 2= Port 2 Battery Charging Enable
Bit 1= Port 1 Battery Charging Enable
Bit 0= Reserved
R/W 00h
Address: F6h Size: 8 bits
Bits Description Type Default
7:2 RESERVED --
1:0 Boost Upstream (BOOST_IOUT_A)
USB electrical signaling drive strength Boost Bit for Upstream Port 'A'.
00 = Normal electrical drive strength
01 = Elevated electrical drive strength (+4% boost)
10 = Elevated electrical drive strength (+8% boost)
11 = Elevated electrical drive strength (+12% boost)
R/W 00b
