參數(shù)資料
型號: uPSD3234A-24T1T
廠商: 意法半導(dǎo)體
英文描述: Flash Programmable System Devices with 8032 Microcontroller Core
中文描述: 閃存可編程系統(tǒng)設(shè)備與8032微控制器內(nèi)核
文件頁數(shù): 91/170頁
文件大?。?/td> 2717K
代理商: UPSD3234A-24T1T
91/170
uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
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 1.5k
pull-up resistor to a
3.3V supply. An approved alternative method is a
7.5k
pull-up to the USB V
CC
supply. This alterna-
tive is defined for low-speed devices with an inte-
grated cable. The chip is specified for the 7.5k
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 46. USB Data Signal Timing and Voltage Levels
Figure 47. Receiver Jitter Tolerance
AI06631
VCR
D-
D+
t
R
t
F
10%
90%
90%
10%
V
OH
V
OL
AI06632
T
JR
T
JR1
T
JR2
Consecutive
Transitions
N*T
PERIOD
+T
JR1
T
PERIOD
Paired
Transitions
N*T
PERIOD
+T
JR2
Differential
Data Lines
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參數(shù)描述
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UPSD3234A-24U1T 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM
UPSD3234A-24U6 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core