Epson Develops Host Controller LSI Designed Exclusively for SD Memory Cards

Seiko Epson Corporation (“Epson”, TSE: 6724) has developed the S1R72E11 host controller LSI designed exclusively for SD memory cards and ideally suited for embedded devices. Shipment of samples has already commenced with a sample price of 650 yen per unit.

Use of the SD memory card, which has become the de facto standard for memory cards, has become common worldwide for a wide range of applications. The SD memory card makes it easier for users to transport stored data because is not only compact, but also offers increasingly high capacities and speeds. The SD memory card is an extremely convenient type of media that can be used with various types of devices, including personal computers. Demand for SD memory cards in embedded devices has also grown dramatically in recent times.

The newly developed S1R72E11 has been equipped exclusively with a SD memory card control function in order to achieve both a slimmer structure and a lower price. This product can be connected to a universal bus on an existing CPU, eliminating the need for major system upgrades and allowing for speedy, simple SD memory card control. By using the sample firmware provided free of charge, it is also possible to reduce development costs and work hours for product development involving the installation of SD memory cards for the first time.

With a wide operating temperature range of -40°C to 85°C and a capability for high-speed transfer, this product supports a wide variety of applications for consumer and industry devices. The S1R72E11 is also compatible with SDHC cards, currently the most popular type of SD memory card with capacities in excess of 2GB, and supports SD Speed Classes 2, 4, and 6, eliminating concerns about the type of media that can be used with it.

System block diagram


  • Slim structure
  • Easy to add on
  • Speedy development
  • Cost reductions

Special features of the S1R72E11

SD host controller functions

  • Compliant with SD Physical Layer Specification Ver.2.0
  • Transfer clock: 50 MHz (max.)
  • Supports SDHC cards
  • Bus width: 4 bit/1 bit

CPU interface functions

  • 16-bit asynchronous CPU bus interface
  • DMA: 1 ch
  • Supports Little Endian/Big Endian

Main specifications

Supply voltage

3.3 V ±0.3 V (single source)

Operating temperature range

-40°C to 85°C


TQFP13-64 pin


Available now

Sample price

650 yen (excluding tax)

Power management

Equipped with SLEEP function (oscillation circuit shutdown mode)

Clock input

External input or crystal oscillator (max. 50 MHz)

About Epson
Epson is a global leader in imaging products including printers, 3LCD projectors and small- and medium-sized LCDs. With an innovative and creative culture, Epson is dedicated to exceeding the vision and expectations of customers worldwide with products known for their superior quality, functionality, compactness and energy efficiency.
Epson is a network of 93,279 employees in 107 companies around the world, and is proud of its ongoing contributions to the global environment and to the communities in which it is located. Led by the Japan-based Seiko Epson Corp., the Group had consolidated sales of 1,347 billion yen in fiscal 2007.