Cypress Semiconductor SL811HS Specifications download pdf (Page 8)

SL811HS

Document #: 38-08008 Rev. *A Page 8 of 29

4.7.1 Typical Crystal Requirements

The following are examples of “typical requirements”. Please note that these specifications are generally found as standard crystal

values and are therefore less expensive than custom values. If crystals are used in series circuits, load capacitance is not

applicable. Load capacitance of parallel circuits is a requirement.

4.8 USB Transceiver

The SL811HS has a built in transceiver that meets USB Specification 1.1. The transceiver is capable of transmitting and receiving

serial data at USB full speed (12 Mbits) and low speed (1.5 Mbits). The driver portion of the transceiver is differential while the

receiver section is comprised of a differential receiver and two single-ended receivers. Internally, the transceiver interfaces to the

Serial Interface Engine (SIE) logic. Externally, the transceiver connects to the physical layer of the USB.

5.0 SL811HS Registers

Operation of the SL811HS is controlled through 16 internal registers. A portion of the internal RAM is devoted to the control

register space, and access is through the microprocessor interface. The registers provide control and status information for

transactions on the USB, microprocessor interface, and interrupts.

Any Write to control register 0FH will enable the SL811HS full features bit. This is an internal bit of the SL811HS that enables

additional features not supported by the SL11H. For SL11H hardware backward compatibility, this register should not be

accessed.

The table below shows the memory map and register mapping of both the SL11H and SL811HS. The SL11H is shown for users

upgrading to the SL811HS.

12-MHz Crystals:

Frequency Tolerance: ±100 ppm or better

Operating Temperature Range: 0°C to 70°C

Frequency: 12 MHz

Frequency Drift over Temperature: ± 50 ppm

ESR (Series Resistance): 60Ω

Load Capacitance: 10 pF min.

Shunt Capacitance: 7 pF max.

Drive Level: 0.1–0.5 mW

Operating Mode: fundamental

48-MHz Crystals:

Frequency Tolerance: ±100 ppm or better

Operating Temperature Range: 0°C to 70°C

Frequency: 48 MHz

Frequency Drift over Temperature: ± 50 ppm

ESR (Series Resistance): 40 Ω

Load Capacitance: 10 pF min.

Shunt Capacitance: 7 pF max.

Drive Level: 0.1–0.5 mW

Operating Mode: third overtone

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 28 29

No comments

Cypress Semiconductor SL811HS Specifications Page 8