AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 87
AN2131QC
Manufacturer Part Number
AN2131QC
Description
IC MCU 8051 8K RAM 24MHZ 80BQFP
Manufacturer
Cypress Semiconductor Corp
Series
EZ-USB®r
Datasheet
1.AN2131SC.pdf
(334 pages)
Specifications of AN2131QC
Applications
USB Microcontroller
Core Processor
8051
Program Memory Type
ROMless
Controller Series
AN213x
Ram Size
8K x 8
Interface
I²C, USB
Number Of I /o
24
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
80-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
428-1307
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The logic for the DISCON and DISCOE bits is shown in Figure 5-2. To simulate a USB
disconnect, the 8051 writes the value 00001010 to USBCS. This floats the DISCON# pin,
and provides an internal DISCON signal to the USB core that causes it to perform discon-
nect housekeeping.
To re-connect to USB, the 8051 writes the value 00000110 to USBCS. This presents a
logic HI to the DISCON# pin, enables the output buffer, and sets the RENUM bit HI to
indicate that the 8051 (and not the USB core) is now in control for USB transfers. This
arrangement allows connecting the 1,500-ohm resistor directly between the DISCON# pin
and the USB D+ line (Figure 5-3).
Page 5-12
DISCON
DISCOE
Figure 5-3. Typical Disconnect Circuit (DISCOE=1)
To 3.3V regulator
USB-B
VCC
GND
D+
J1
D-
Figure 5-2. Disconnect Pin Logic
1
2
3
4
Chapter 5. EZ-USB CPU
Internal Logic
1500
DISCON#
D-
D+
EZ-USB
DISCON#
pin
EZ-USB TRM v1.9
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