UPSD3212C-40U6 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

UPSD3212C-40U6

Flash programmable system devices with 8032 MCU and USB and programmable logic

STMicroelectronics 

uPSD3212A, uPSD3212C, uPSD3212CV

External USB Pull-Up Resistor

The USB system specifies a pull-up resistor on the

D- pin for low-speed peripherals. The USB

Spec 1.1 describes a 1.5kΩ pull-up resistor to a

3.3V supply. An approved alternative method is a

7.5kΩ pull-up to the USB VCC supply. This alterna-

tive is defined for low-speed devices with an inte-

grated cable. The chip is specified for the 7.5kΩ

pull-up. This eliminates the need for an external

3.3V regulator, or for a pin dedicated to providing

a 3.3V output from the chip.

Figure 42. USB Data Signal Timing and Voltage Levels

VOH

VCR

VOL

tR

D+

10%

D-

90%

tF

90%

10%

AI06631

Figure 43. Receiver Jitter Tolerance

TPERIOD

Differential

Data Lines

TJR

TJR1

TJR2

Consecutive

Transitions

N*TPERIOD+TJR1

Paired

Transitions

N*TPERIOD+TJR2

AI06632

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