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Cypress Semiconductor Corporation

SL811HS and SL811HST: Application Notes

and specifications contained in this document are subject to change without

notice.

Date: 07/26/01

Revision: 1.21

Page: 13

2.6. M/S pin (pin27/pin40)

It is recommended that M/S pin is “NC”. If you want to set the “Host” or “Slave” mode as power-

on-default, you need to make M/S pin be tied to

Mode M/S pin

Host GND

Slave VCC3.3

2.7. Pull-up/down registers on USB lines

A 1.5K pull-up resister is required for “Slave” mode, a 15K pull-down resisters is required for

“Host” mode. You will need to enable/disable each registers.

NOTE: See the “SL811HS and SL811HST Application Notes page.8” for more details.

2.8. Host/Slave detector

Since the SL811HS does not have a mechanism to know if the inserted device is operating as

“Host” or as “Slave”, you need to add a Host/Slave detector. Following are examples of this.

(Example.1) Using 2 different cable with special connectors either “Host” or “Slave”

Connector for Host (pin5 and 6 are inter-connected.)

GND

USB Bus power switch

D-

VBUS

CPU_GPIO

VCC

D+

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Cypress Semiconductor SL811HS Bedienungsanleitung Seite 13