UPSD3422E-40U6 STMicroelectronics, UPSD3422E-40U6 Datasheet - Page 76
UPSD3422E-40U6
Manufacturer Part Number
UPSD3422E-40U6
Description
MCU 8BIT 8032 64KB FLASH 80TQFP
Manufacturer
STMicroelectronics
Series
µPSDr
Datasheet
1.UPSD3422EV-40U6.pdf
(300 pages)
Specifications of UPSD3422E-40U6
Core Processor
8032
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, IrDA, SPI, UART/USART, USB
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
46
Program Memory Size
80KB (80K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
80-TQFP, 80-VQFP
For Use With
497-5577 - BOARD EVAL USB POWER SWITCH497-5518 - EVAL BOARD RFID READER
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Other names
497-4903
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
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Manufacturer:
STMicroelectronics
Quantity:
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Oscillator and external components
16
Note:
76/300
Oscillator and external components
The oscillator circuit of UPSD34xx devices is a single stage, inverting amplifier in a Pierce
oscillator configuration. The internal circuitry between pins XTAL1 and XTAL2 is basically an
inverter biased to the transfer point. Either an external quartz crystal or ceramic resonator
can be used as the feedback element to complete the oscillator circuit. Both are operated in
parallel resonance. Ceramic resonators are lower cost, but typically have a wider frequency
tolerance than quartz crystals. Alternatively, an external clock source from an oscillator or
other active device may drive the UPSD34xx oscillator circuit input directly, instead of using
a crystal or resonator.
The minimum frequency of the quartz crystal, ceramic resonator, or external clock source is
3MHz if the USB is used. The minimum is 8MHz if I
cases. This frequency is f
MCU clock generation on page
The pin XTAL1 is the high gain amplifier input, and XTAL2 is the output. To drive the
UPSD34xx device externally from an oscillator or other active device, XTAL1 is driven and
XTAL2 is left open-circuit. This external source should drive a logic low at the voltage level of
0.3 V
5 V tolerant.
Most of the quartz crystals in the range of 25MHz to 40 MHz operate in the third overtone
frequency mode. An external LC tank circuit at the XTAL2 output of the oscillator circuit is
needed to achieve the third overtone frequency, as shown in
this LC circuit, the crystal will oscillate at a fundamental frequency mode that is about 1/3 of
the desired overtone frequency.
In
overtone mode) do not need the LC circuit components. Since quartz crystals and ceramic
resonators have their own characteristics based on their manufacturer, it is wise to also
consult the manufacturer’s recommended values for external components.
Figure 14 on page 77
CC
or below, and logic high at 0.7V V
crystals which are specified to operate in fundamental mode (not
OSC
, which can be divided internally as described in
68.
CC
UPSD3422, UPSD3433, UPSD3434, UPSD3454
or above, up to 5.5 V V
2
C is used. The maximum is 40MHz in all
Figure 14 on page
CC
. The XTAL1 input is
Section 14:
77. Without
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