Device integration drives down USB cost
By Robert Cravotta -- EDN, March 31, 2005
Cypress Semiconductor based its new enCoRe II (enhanced component-reduction) CY7C633xx, CY7C638xx, and CY7C639xx microcontroller lines on the M8 architecture. The devices integrate features and external components that target low-speed USB applications, including an on-chip oscillator, internal USB pullup resistors, wake-up circuitry, and a 3.3V regulator. The flash-based, 24-MHz devices integrate a USB transceiver and conform to USB Specification Version 2.0 and USB HID (host-interface-device) Specification Version 1.1. The devices support one control endpoint, two data endpoints, and one low-speed USB-device address.
These devices include as much as 8 kbytes of flash that supports EEPROM emulation and as much as 256 bytes of RAM, and they require no external components to switch between supporting PS/2 and USB interfaces. Typical power consumption for these devices is 10 mA at 6 MHz and is as low as 10 μA in sleep mode. The internal 125-mA, 3.3V voltage regulator can power external 3.3V devices. To simplify the interface to RF inputs for wireless designs, these devices provide a two-channel, 8-bit or one-channel, 16-bit capture timer that store both rising and falling edge times.
The CY7C639xx controllers enable a lower component count for keyboard designs. The CY7C638xx products target high-end optical-mice and wireless-dongle designs. The CY7C633xx devices target low-end optical- and optomechanical-mice designs. All of these devices support an operating-temperature range of 0 to 70°C and are available for sampling; production units will become available in April. CY7C633xx devices are available in 16-pin PDIP and SOIC packages. CY7C638xx controllers are available in PDIP, SOIC, and QSOP packages, and CY7C639xx products are available in 40-pin PDIP and 28/48-pin SSOP packages. Prices for these devices start 85 cents, 90 cents, and $1.30 (100,000) for the CY7C633xx, CY7C638xx, and CY7C639xx, respectively.
Cypress Semiconductor, 1-408-943-2600, www.cypress.com.
