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Cypress Semiconductor Corporation
SL811HS and SL811HST: Application Notes
©2001 Cypress Semiconductor Corporation. All rights reserved. The information
and specifications contained in this document are subject to change without
notice.
Date: 07/26/01
Revision: 1.21
Page: 10
Open Collector **
HOST/SLAVE
500mA
Open Collector **
U3A
74LVQ125
2 3
1
U3B
74LVQ125
5 6
4
H_PWC
U4A
74LCX06
1 2
R8
15K
R4
1.5K
C3
4.7uH
JP2
1
2
3
4
U2
TPS2104DBVR
1
2
3
5
4
EN
GND
IN2
IN1
OUT
External CPU GPIO
** Needs 3.3V Logic
JP1
1
2
3
4
+3.3V
C2
0.01u
DATA+
R7
15K
Invertor **
F1
FUSE
1 2
I C2
DATA-
External CPU GPIO
VCC
NOTE:
CONNECT EXTERNAL DEVICE TO EITHER JP1 OR JP2.
NEVER CONNECT TO BOTH SIMULTANEOUSELY.
USB TYPE A
CONNECTOR
USB TYPE B
CONNECTOR
Figure 2: SL811HS Host/Slave diagram
2.5. Software Initialization
Cypress provides Host and Slave code in development Kit. To switch Host/Slave mode, you
need to write an appropriate value to the register 0FH of SL811HS. After writing value to
register 0FH, you need to do Initialization.
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