EG80C196EA Intel, EG80C196EA Datasheet - Page 27

• Manufacturer Part Number: EG80C196EA
• Description: IC MPU 16-BIT 5V 40MHZ 160-QFP
• Manufacturer: Intel
• Series: 80Cr

Specifications of EG80C196EA

• Core Processor: MCS 96
• Core Size: 16-Bit
• Speed: 40MHz
• Connectivity: SIO
• Peripherals: PWM, WDT
• Number Of I /o: 83
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 160-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Other names: 864391

6.7
Preliminary Datasheet
A/D Sample and Conversion Times
Two parameters, sample time and conversion time, control the time required for an A/D
conversion. The sample time is the length of time that the analog input voltage is actually
connected to the sample capacitor. If this time is too short, the sample capacitor will not charge
completely. If the sample time is too long, the input voltage may change and cause conversion
errors. The conversion time is the length of time required to convert the analog input voltage stored
on the sample capacitor to a digital value. The conversion time must be long enough for the
comparator and circuitry to settle and resolve the voltage. Excessively long conversion times allow
the sample capacitor to discharge, degrading accuracy.
The AD_TIME register programs the A/D sample and conversion times. Use the T
specifications in
otherwise, erroneous conversion results may occur.
When the SAM and CONV values are known, write them to the AD_TIME register. Do not write
to this register while a conversion is in progress; the results are unpredictable.
Use the following formulas to determine the SAM and CONV values.
where:
At 40 Mhz, to meet T
10-bit mode:
8-bit mode:
SAM
CONV
T
T
f
B
SAM
CONV
SAM
CONV
SAM
CONV
Table 12
SAM
equals a number, 1 to 7
equals a number, 2 to 31
is the sample time, in sec
is the conversion time, in sec
is the operating frequency, in MHz
is the number of bits to be converted (8 or 10)
=
=
SAM
=
=
5 6 7
5 6 7
=
18 19 20
23 24
and T
and
T
------------------------------ -
S A M
Table 14
CONV
8
T
T
f 2
SAM
SAM
–
31
minimum specifications:
31
to determine appropriate values for SAM and CONV;
1 s
1 s
T
CONV
(Table 12
T
(Table 12
CONV
10 s
and
10 s
CONV
and
Table
Table
14)
=
14)
T
----------------------------------
C O N V
2
80C196EA - Commercial
B
f 3
–
–
1
SAM
and T
CONV
23