参数资料
型号: KSZ8864RMN
厂商: Micrel Inc
文件页数: 4/111页
文件大小: 0K
描述: IC ETHERNET SW 4PORT 64QFN
标准包装: 348
控制器类型: 以太网开关控制器
接口: MII,RMII
电源电压: 1.8V,2.5V,3.3V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘
供应商设备封装: 64-QFN(8x8)
包装: 托盘
配用: 576-3869-ND - BOARD EVALUATION FOR KSZ8864RMN
其它名称: 576-3787
KSZ8864RMN-ND
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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