AN2131QC Cypress Semiconductor Corp, AN2131QC Datasheet - Page 189

• Manufacturer Part Number: AN2131QC
• Description: IC MCU 8051 8K RAM 24MHZ 80BQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB®r

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

A USB device recognizes SUSPEND as 3 ms of a bus idle (“J”) state. The EZ-USB core
alerts the 8051 by asserting the USB (INT2) interrupt and the SUSPEND interrupt vector.
This gives the 8051 code a chance to perform power SUSPEND interrupt vector. This
gives the 8051 code a chance to perform power conservation housekeeping before shut-
ting down the oscillator.
Page 11-2
11.2
Suspend
No USB activity
for 3 msec.
Figure 11-2. EZ-USB Suspend Sequence
Chapter 11. EZ-USB Power Management
"SUSPEND"
Interrupt
STOP
USB
PCON.0
Oscillator
12 MHz
48 MHz
8051
div by
INT2
PLL
2
CLK24
EZ-USB TRM v1.9