USB4640/USB4640i
High-Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
General Description
Features
The Microchip USB4640/USB4640i is a Hi-Speed
HSIC USB hub and card reader combo solution with an
upstream port that is compliant to HSIC 1.0 (supple-
ment to the USB 2.0 Specification). The two down-
stream ports are compliant with the USB 2.0
Specification.
• Compliance with the following flash media card
specifications SD 2.0; MMC 4.2; MS 1.43; MS-
Pro 1.02; MS-Pro-HG 1.01; MS-Duo 1.10; and
xD 1.2
• Low-power digital HSIC interface offers a replace-
ment for onboard host and device connection for
analog USB bus cable
• HSIC interface enables printers, mobile PCs,
ultra-mobile PCs, and cell phone products to
reduce the total power budget
• HSIC interface provides use of USB connectivity
and compatibility with existing USB drivers and
software
• External 1.2 V reference allows upstream/down-
stream HSIC links to use the same voltage refer-
ence
• Supports a single external 3.3 V supply source;
internal regulators provide 1.8 V internal core volt-
age for additional bill of materials and power sav-
ings
• The hub transaction translator (TT) supports Full-
Speed and Low-Speed peripheral operation
• 9 KB RAM | 64 KB on-chip ROM
• Enhanced EMI rejection and ESD protection per-
formance
High-Speed Inter-Chip (HSIC) is a digital interconnect
bus that enables the use of USB technology as a low-
power chip-to-chip interconnect at speeds up to
480 Mb/s. The HSIC interface is an industry standard
2-pin digital interface which uses standard USB soft-
ware. The USB4640/USB4640i provides an ultra fast
interface between an HSIC enabled host and several
popular flash media formats. The controller allows
read/write capability to flash media from the following
families:
- Secure DigitalTM (SD)
- MultiMediaCardTM (MMC)
- Memory Stick® (MS)
- xD-Picture CardTM (xD)1
The USB4640/USB4640i combo solution leverages
Microchip’s innovative technology that delivers indus-
try-leading data throughput in mixed-speed USB envi-
ronments. Average sustained transfer rates exceeding
35 MB/s are possible.2
• Hub and flash media reader/writer configuration
from a single source:
Highlights
- Configures internal code using an external
• Upstream HSIC port and 2 exposed Hi-Speed
USB 2.0 downstream ports for external peripheral
expansion
• Dedicated flash media reader internally attached
to a 3rd downstream port of the hub as a USB
compound device
- single or multiplexed flash media reader
interface
• PortMap - Flexible port mapping and disable
sequencing
I2C EEPROM
- Supports external code using an SPI Flash
EEPROM
- Customizable vendor ID, product ID, and lan-
guage ID if using an external EEPROM
• The USB4640 supports the commercial tempera-
ture range of 0°C to +70°C
• The USB4640i supports the industrial tempera-
ture range of -40°C to +85°C
• 48-pin QFN (7 x 7 mm) RoHS compliant package
• PortSwap - Programmable USB differential-pair
pin locations ease PCB design by aligning USB
signal lines directly to connectors
• PHYBoost - Programmable USB signal drive
strength for recovering signal integrity using 4-
level driving strength resolution
Applications
• 3G/4G handsets, smartphones, cell phones, and
other mobile devices
• Desktop and mobile PCs
• Printers
• GPS navigation systems
• Media players/viewers
• Consumer A/V
• Set-top boxes
1. Obtain user license from the x-D-Picture Card License
Office.
• Industrial products
2. Host and Media dependent.
2013- 2018 Microchip Technology Inc.
DS00001922B-page 1
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