UPSD3234A-40U6T STMicroelectronics, UPSD3234A-40U6T Datasheet - Page 102

• 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: -

USB hardware
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Low speed driver characteristics
The UPSD323xx devices use a differential output driver to drive the Low Speed USB data
signal onto the USB cable. The output swings between the differential high and low state are
well balanced to minimize signal skew. The slew rate control on the driver minimizes the
radiated noise and cross talk on the USB cable. The driver’s outputs support three-state
operation to achieve bi-directional half duplex operation. The UPSD323xx devices driver
tolerates a voltage on the signal pins of -0.5 V to 3.6 V with respect to local ground
reference without damage. The driver tolerates this voltage for 10.0µs while the driver is
active and driving, and tolerates this condition indefinitely when the driver is in its high
impedance state.
A low speed USB connection is made through an unshielded, untwisted wire cable a
maximum of 3 meters in length. The rise and fall time of the signals on this cable are well
controlled to reduce RFI emissions while limiting delays, signaling skews and distortions.
The UPSD323xx devices driver reaches the specified static signal levels with smooth rise
and fall times, resulting in segments between low speed devices and the ports to which they
are connected.
Figure 43. Low speed driver signal waveforms
Receiver characteristics
UPSD323xx devices have a differential input receiver which is able to accept the USB data
signal. The receiver features an input sensitivity of at least 200 mV when both differential
data inputs are in the range of at least 0.8 V to 2.5 V with respect to its local ground
reference. This is the common mode range, as shown in
static input voltages between -0.5 V to 3.8 V with respect to its local ground reference
without damage. In addition to the differential receiver, there is a single-ended receiver for
each of the two data lines. The single-ended receivers have a switching threshold between
0.8 V and 2.0 V (TTL inputs).
V
V
SE
SE
(max)
(min)
Signal Pins
V
SS
Driver
1.5 Mb/s
One Bit
Time
UPSD3234A, UPSD3234BV, UPSD3233B, UPSD3233BV
Signal pins
pass output
spec levels
with minimal
reflections and
ringing
Figure
44. The receiver tolerates
AI06629