PIC16F87-I/ML Microchip Technology, PIC16F87-I/ML Datasheet - Page 476

• Manufacturer Part Number: PIC16F87-I/ML
• Description: IC MCU FLASH 4KX14 EEPROM 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F87-I/ML

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Oscillator Type: Internal
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Controller Family/series: PIC16F
• No. Of I/o's: 16
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 368Byte
• Cpu Speed: 20MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT28QFN3 - SOCKET TRAN ICE 18DIP/28QFNAC164322 - MODULE SOCKET MPLAB PM3 28/44QFNAC164033 - ADAPTER 28QFN TO 18DIPDV007003 - PROGRAMMER UNIVERSAL PROMATE II
• Data Converters: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
25.10
DS31025A-page 25-18
Discrimination Ratio
Discrimination ratio is a way to calculate the contrast levels that a panel can achieve. The first
example is a static waveform from Figure 25-3. The voltages V
of 1 and 0. The next step is to construct an equation for one frame to help visualize the DC and
RMS voltages present on an individual pixel that is ON and OFF. The rest of the following shows
the calculation of the DC, RMS, and Discrimination Ratio.
Example 25-3:
See
Figure 25-3
D = V
Discrimination Ratio Calculation for Static MUX
V
COMx - SEGx [ON]
COMx - SEGx [OFF]
RMS
RMS
V
V
for Static waveform.
RMS
RMS
[ON]
[OFF]
[ON] =
[OFF] =
= 1 V
0 V
V
V
= 1 - 1,
= 0 + 0,
(1)
(0)
=
2
2
+ (-1)
+ (0)
2
2
V
V
DC
DC
2
2
= 0
= 0
=
=
1
and V
1 V
0 V
1997 Microchip Technology Inc.
0
will be assigned values