PIC18F65K90T-I/PT Microchip Technology, PIC18F65K90T-I/PT Datasheet - Page 281

• Manufacturer Part Number: PIC18F65K90T-I/PT
• Description: 32kB Flash, 2kB RAM, 1kB EE, NanoWatt XLP, LCD 64 TQFP 10x10x1mm T/R
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 18Fr

Specifications of PIC18F65K90T-I/PT

• Processor Series: PIC18F
• Core: PIC
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 32 KB
• Data Ram Size: 2 KB
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 64 MHz
• Number Of Timers: 8
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734, 52712-325, EWPIC18
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 16 Channel
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 64MHz
• Connectivity: I²C, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 53
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 16x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Lead Free Status / Rohs Status: Details

20.3
The LCD module can be configured in one of three bias
types:
• Static bias (two voltage levels: V
• 1/2 bias (three voltage levels: V
• 1/3 bias (four voltage levels: V
LCD bias voltages can be generated with an internal or
external resistor ladder. The internal resistor ladder
eliminates the external solution’s use of up to three
pins.
FIGURE 20-3:
 2009-2011 Microchip Technology Inc.
V
2/3 V
* These values are provided for design guidance only and should be optimized for the application by the designer.
AV
AV
AV
DD
DD
DD
DD
)
DD
*
*
*
LCD Bias Types
and V
LCD Bias 3
DD
10 k*
10 k*
)
LCD BIAS EXTERNAL RESISTOR LADDER CONNECTION DIAGRAM
LCD Bias 2
SS
10 k*
SS
SS
, 1/3 V
, 1/2 V
and V
DD
DD
DD
,
LCD Bias 1
and
)
10 k*
10 k*
VLCD3
VLCD2
VLCD1
VLCD0
PIC18F87K90 FAMILY
If the internal reference ladder is used to generate bias
voltages, it also can provide software contrast control
(using LCDCST<2:0>). An external resistor ladder can
not do this.
20.3.1
The external resistor ladder should be connected to the
VLCD1 pin (Bias 1), VLCD2 pin (Bias 2), VLCD3 pin
(Bias 3) and V
highest voltage to the LCD glass and can be connected
to V
Figure 20-3
resistor ladder to the Bias pins.
Connections for External R-ladder
To
LCD
Driver
DD
AV
AV
or a lower voltage.
SS
SS
VLCD0
VLCD1
VLCD2
VLCD3
EXTERNAL RESISTOR BIASING
shows the proper way to connect the
Static Bias
1/2 Bias
1/3 Bias
SS
. The VLCD3 pin is used to set the
Static
AV
AV
Bias
—
—
SS
DD
1/2 AV
1/2 AV
1/2 Bias 1/3 Bias
AV
AV
DS39957D-page 281
SS
DD
DD
DD
1/3 AV
2/3 AV
AV
AV
SS
DD
DD
DD