PIC16LC926-I/PT Microchip Technology, PIC16LC926-I/PT Datasheet - Page 97
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PIC16LC926-I/PT
Manufacturer Part Number
PIC16LC926-I/PT
Description
IC MCU CMOS 20MHZ 8K W/LCD64TQFP
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Specifications of PIC16LC926-I/PT
Core Size
8-Bit
Program Memory Size
14KB (8K x 14)
Core Processor
PIC
Speed
20MHz
Connectivity
I²C, SPI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
25
Program Memory Type
OTP
Ram Size
336 x 8
Voltage - Supply (vcc/vdd)
2.5 V ~ 5.5 V
Data Converters
A/D 5x10b
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TFQFP
Controller Family/series
PIC16C
No. Of I/o's
25
Ram Memory Size
336Byte
Cpu Speed
20MHz
No. Of Timers
3
Interface
I2C, SPI
Embedded Interface Type
I2C, SPI
Rohs Compliant
Yes
Processor Series
PIC16LC
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
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16LC926-I/PT
Manufacturer:
Microchip Technology
Quantity:
10 000
Part Number:
PIC16LC926-I/PT
Manufacturer:
MIC
Quantity:
20 000
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 =