UPD78F0500MC-5A4-A Renesas Electronics America, UPD78F0500MC-5A4-A Datasheet - Page 426

• Manufacturer Part Number: UPD78F0500MC-5A4-A
• Description: MCU 8BIT FLASH SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2r

Specifications of UPD78F0500MC-5A4-A

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0/Kx2
13.5 How to Read A/D Converter Characteristics Table
(1) Resolution
(2) Overall error
(3) Quantization error
(4) Zero-scale error
R01UH0008EJ0401 Rev.4.01
Jul 15, 2010
Here, special terms unique to the A/D converter are explained.
This is the minimum analog input voltage that can be identified. That is, the percentage of the analog input voltage
per bit of digital output is called 1LSB (Least Significant Bit). The percentage of 1LSB with respect to the full scale is
expressed by %FSR (Full Scale Range).
1LSB is as follows when the resolution is 10 bits.
1LSB = 1/2
Accuracy has no relation to resolution, but is determined by overall error.
This shows the maximum error value between the actual measured value and the theoretical value.
Zero-scale error, full-scale error, integral linearity error, and differential linearity errors that are combinations of these
express the overall error.
Note that the quantization error is not included in the overall error in the characteristics table.
When analog values are converted to digital values, a ±1/2LSB error naturally occurs. In an A/D converter, an analog
input voltage in a range of ±1/2LSB is converted to the same digital code, so a quantization error cannot be avoided.
Note that the quantization error is not included in the overall error, zero-scale error, full-scale error, integral linearity
error, and differential linearity error in the characteristics table.
This shows the difference between the actual measurement value of the analog input voltage and the theoretical
value (1/2LSB) when the digital output changes from 0......000 to 0......001.
If the actual measurement value is greater than the theoretical value, it shows the difference between the actual
measurement value of the analog input voltage and the theoretical value (3/2LSB) when the digital output changes
from 0……001 to 0……010.
1 …… 1
0 …… 0
= 0.098%FSR
Figure 13-14. Overall Error
10
0
= 1/1024
Ideal line
Analog input
Overall
error
AV
REF
1 …… 1
0 …… 0
Figure 13-15. Quantization Error
0
1/2LSB
CHAPTER 13 A/D CONVERTER
Analog input
1/2LSB
Quantization error
AV
REF
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