IC MCU 8BIT OTP 4K 20 PDIP

ST62T20CB6

Manufacturer Part NumberST62T20CB6
DescriptionIC MCU 8BIT OTP 4K 20 PDIP
ManufacturerSTMicroelectronics
SeriesST6
ST62T20CB6 datasheet
 


Specifications of ST62T20CB6

Core ProcessorST6Core Size8-Bit
Speed8MHzPeripheralsLVD, POR, WDT
Number Of I /o12Program Memory Size4KB (4K x 8)
Program Memory TypeOTPRam Size64 x 8
Voltage - Supply (vcc/vdd)3 V ~ 6 VData ConvertersA/D 8x8b
Oscillator TypeInternalOperating Temperature-40°C ~ 85°C
Package / Case20-DIP (0.300", 7.62mm)Controller Family/seriesST6
No. Of I/o's12Ram Memory Size64Byte
Cpu Speed8MHzNo. Of Timers1
Rohs CompliantYesProcessor SeriesST62T2x
CoreST6Data Bus Width8 bit
Data Ram Size64 BMaximum Clock Frequency8 MHz
Number Of Programmable I/os12Number Of Timers2
Operating Supply Voltage3 V to 6 VMaximum Operating Temperature+ 85 C
Mounting StyleThrough HoleDevelopment Tools By SupplierST622XC-KIT/110, ST62GP-EMU2, ST62E2XC-EPB/110, ST62E6XC-EPB/US, STREALIZER-II
Minimum Operating Temperature- 40 COn-chip Adc8 bit
Lead Free Status / RoHS StatusLead free / RoHS CompliantEeprom Size-
Connectivity-Other names497-2098-5
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Page 21/104

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CLOCK SYSTEM (Cont’d)
5.1.2 Oscillator Safeguard (OSG)
The Oscillator Safeguard (OSG) feature is a
means of dramatically improving the operational
integrity of the MCU. It is available when the OSG
ENABLED option is selected in the option byte (re-
fer to the Option Bytes section of this document).
The OSG acts as a filter whose cross-over fre-
quency is device dependent and provides three
basic functions:
– Filtering spikes on the oscillator lines which
would result in driving the CPU at excessive fre-
quencies
– Management of the Low Frequency Auxiliary
Oscillator (LFAO), (useable as low cost internal
clock source, backup clock in case of main oscil-
lator failure or for low power consumption)
– Automatically limiting the f
INT
a function of supply voltage, to ensure correct
operation even if the power supply drops.
5.1.2.1 Spike Filtering
Spikes on the oscillator lines result in an effectively
increased internal clock frequency. In the absence
of an OSG circuit, this may lead to an over fre-
quency for a given power supply voltage. The
OSG filters out such spikes (as illustrated in
10). In all cases, when the OSG is active, the max-
Figure 10. OSG Filtering Function
f
OSC
f
OSG
f
INT
Figure 11. LFAO Oscillator Function
MAIN OSCILLATOR
STOPS
f
OSC
f
LFAO
f
INT
ST6208C/ST6209C/ST6210C/ST6220C
imum internal clock frequency, f
f
, which is supply voltage dependent.
OSG
5.1.2.2
Variations
Over-frequency, at a given power supply level, is
seen by the OSG as spikes; it therefore filters out
some cycles in order that the internal clock fre-
quency of the device is kept within the range the
particular device can stand (depending on V
and below f
cy with OSG enabled.
5.1.2.3 LFAO Management
When the OSG is enabled, the Low Frequency
Auxiliary Oscillator can be used (see
5.1.3).
clock frequency as
Note: The OSG should be used wherever possible
as it provides maximum security for the applica-
tion. It should be noted however, that it can in-
crease power consumption and reduce the maxi-
mum operating frequency to f
Characteristics section).
Caution: Care has to be taken when using the
OSG, as the internal frequency is defined between
a minimum and a maximum value and may vary
Figure
depending on both V
cise timing measurements, it is not recommended
to use the OSG.
f
f
OSC>
OSG
INTERNAL CLOCK DRIVEN BY LFAO
, is limited to
INT
Management
of
Supply
: the maximum authorised frequen-
OSG
(see Electrical
OSG
and temperature. For pre-
DD
f
f
OSC<
OSG
MAIN OSCILLATOR
RESTARTS
Voltage
),
DD
Section
21/104
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