參數(shù)資料
型號: PIC18F452-I/PT
廠商: Microchip Technology
文件頁數(shù): 4/134頁
文件大?。?/td> 0K
描述: IC MCU FLASH 16KX16 EE 44TQFP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 160
系列: PIC® 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 40MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,LVD,POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 1.5K x 8
電壓 - 電源 (Vcc/Vdd): 4.2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤
配用: XLT44PT3-ND - SOCKET TRAN ICE 44MQFP/TQFP
AC164305-ND - MODULE SKT FOR PM3 44TQFP
444-1001-ND - DEMO BOARD FOR PICMICRO MCU
AC164020-ND - MODULE SKT PROMATEII 44TQFP
1997 Microchip Technology Inc.
DS30444E - page 101
PIC16C9XX
13.5
Voltage Generation
There are two methods for LCD voltage generation,
internal charge pump, or external resistor ladder.
13.5.1
CHARGE PUMP
The LCD charge pump is shown in Figure 13-13. 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 VLCD1 on the charge
pump. The charge pump boosts VLCD1 into VLCD2 =
2*VLCD1 and VLCD3 = 3 * VLCD1. When the charge pump
is not operating, Vlcd3 will be internally tied to VDD. See
the Electrical Specications section for charge pump
capacitor and potentiometer values.
13.5.2
EXTERNAL R-LADDER
The LCD module can also use an external resistor lad-
der
(R-Ladder)
to
generate
the
LCD
voltages.
Figure 13-13 shows external connections for static and
1/3 bias. The VGEN (LCDCON<4>) bit must be cleared
to use an external R-Ladder.
FIGURE 13-13:CHARGE PUMP AND RESISTOR LADDER
C2
VLCD2
VLCD1
VLCD3
C1
VDD
VLCDADJ
10
A
Connections for
internal charge
pump, VGEN = 1
VDD
Connections for
external R-ladder,
1/3 Bias,
VGEN = 0
Connections for
external R-ladder,
Static Bias,
VGEN = 0
nominal
Charge Pump
LCDEN
SLPEN
0.47
F*
0.47
F*
0.47
F*
0.47
F*
10k*
5k*
10k*
130k*
100k*
* These values are provided for design guidance only and should be
optimized to the application by the designer.
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