UPSD3234A-40U6T STMicroelectronics, UPSD3234A-40U6T Datasheet - Page 103

• Manufacturer Part Number: UPSD3234A-40U6T
• Description: IC MCU 8032 64KB FLASH 80TQFP
• Manufacturer: STMicroelectronics
• Series: µPSDr

Specifications of UPSD3234A-40U6T

• Core Processor: 8032
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, UART/USART, USB
• Peripherals: LVR, POR, PWM, WDT
• Number Of I /o: 46
• Program Memory Size: 288KB (288K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
17.4
Figure 44. Differential input sensitivity over entire common mode range
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 1.5 kΩ pull-up resistor to a 3.3 V supply. An approved alternative
method is a 7.5 kΩ pull-up to the USB V
devices with an integrated cable. The chip is specified for the 7.5 kΩ pull-up. This eliminates
the need for an external 3.3 V regulator, or for a pin dedicated to providing a 3.3 V output
from the chip.
Figure 45. USB data signal timing and voltage levels
Figure 46. Receiver jitter tolerance
Differential
Data Lines
T
PERIOD
1.0
0.8
0.6
0.4
0.2
0.0
V
VCR
0.0
V
OH
OL
0.2
D+
D-
0.4
10%
0.6
N*T
T
Consecutive
0.8
JR
Transitions
t
R
PERIOD
1.0
90%
+T
Common Mode Input Voltage (volts)
JR1
1.2
N*T
CC
1.4
Transitions
PERIOD
Paired
supply. This alternative is defined for low-speed
1.6
+T
1.8
JR2
2.0
90%
T
2.2
JR1
t
F
2.4
10%
2.6
2.8 3.0
3.2
T
JR2
USB hardware
AI06630
AI06631
AI06632
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