PIC16C926-I/L Microchip Technology, PIC16C926-I/L Datasheet - Page 97

• Manufacturer Part Number: PIC16C926-I/L
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,LDCC,68PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Cr

Specifications of PIC16C926-I/L

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Size: 14KB (8K x 14)
• Program Memory Type: OTP
• Ram Size: 336 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 68-PLCC
• Processor Series: PIC16C
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 336 B
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 25
• Number Of Timers: 1 x 16 bit
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 5 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC164308 - MODULE SKT FOR PM3 68PLCCDVA16XL680 - ADAPTER DEVICE FOR MPLAB-ICEAC164024 - ADAPTER PICSTART PLUS 68PLCCAC164022 - MODULE SKT PROMATEII 68PLCC
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details
• Other names: PIC16C926I/L

11.5
There are two methods for LCD voltage generation:
internal charge pump, or external resistor ladder.
11.5.1
The LCD charge pump is shown in Figure 11-9. The
1.0V - 2.3V regulator will establish a stable base volt-
age from the varying battery voltage. This regulator is
adjustable through the range by connecting a variable
external resistor from VLCDADJ to ground. The poten-
tiometer provides contrast adjustment for the LCD. This
base voltage is connected to V
FIGURE 11-9:
2001 Microchip Technology Inc.
* These values are provided for design guidance only and should be optimized to the application by the designer.
V
DD
100 k *
VLCDADJ
130 k *
Voltage Generation
Regulator
10 A
CHARGE PUMP
CHARGE PUMP AND RESISTOR LADDER
V
V
LCD
LCD
CPCLK
VGEN
3
V
0.47 F*
3
3
LCD
10 k *
LCD
3
1 on the charge
2
V
0.47 F*
LCD
10 k *
10 k *
Preliminary
2
3
Control
3
Logic
2
V
0.47 F*
C
C
LCD
pump. The charge pump boosts V
2*V
pump is not operating, Vlcd3 will be internally tied to
V
charge pump capacitor and potentiometer values.
11.5.2
The LCD module can also use an external resistor lad-
der (R-Ladder) to generate the LCD voltages.
Figure 11-9 shows external connections for static and
1/3 bias. The VGEN (LCDCON<4>) bit must be cleared
to use an external R-Ladder.
DD
2
1
LCD
. See the Electrical Specifications section for
10 k *
1 and V
C+ VGEN
EXTERNAL R-LADDER
VGEN
PIC16C925/926
LCD
3 = 3 * V
0.47 F*
C1
5 k *
5 k *
LCD
C2
1. When the charge
LCD
V
V
V
V
Connections for
internal charge
pump, VGEN = 1
Connections for
external R-ladder,
1/3 Bias,
VGEN = 0
Connections for
external R-ladder,
Static Bias,
VGEN = 0
DS39544A-page 95
LCD
LCD
LCD
LCD
1 into V
3
2
1
0
To
LCD
Drivers
LCD
2 =