参数资料
型号: TC7129CKW
厂商: Microchip Technology
文件页数: 10/28页
文件大小: 0K
描述: IC ADC 4 1/2DGT LCD DVR 44-MQFP
标准包装: 96
显示器类型: LCD
配置: 7 段显示
数字或字符: A/D,4.5 位数字
电流 - 电源: 800µA
电源电压: 6 V ~ 12 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 44-QFP
供应商设备封装: 44-PQFP(10x10)
包装: 托盘
TC7129
4.2.3
+5V Power Supply
Measurements are made with respect to power supply
ground. COMMON (pin 28) is connected to REF LO
(pin 35). A voltage doubler is needed, since the supply
voltage is less than the 6V minimum needed by the
TC7129. DGND (pin 36) must be isolated from power
V
+
24
supply ground (see Figure 4-3).
+5V
24
V+
0.1 μF
TC7129
34
35
External
Logic
I LOGIC
36
TC7129
DGND
23
V-
8
V+
2
36
0.1 μF
DGND
V–
28
33
32
+
V IN
Figure 4-4:
Directly to DGND.
External Logic Referenced
V+
+
23
TC7660
4
10 μF
24
5
GND
External
3
10 μF
+
Logic
TC7129
Figure 4-3: Powering the TC7129 From
a +5V Power Supply.
+
36
DGND
4.3
Connecting to External Logic
I LOGIC
23
External logic can be directly referenced to DGND
(pin 36), provided that the supply current of the external
logic does not exceed the sink current of DGND
(Figure 4-4). A safe value for DGND sink current is
1.2 mA. If the sink current is expected to exceed this
value, a buffer is recommended (see Figure 4-5).
Figure 4-5: External Logic Referenced
to DGND with Buffer.
V–
4.4
Temperature Compensation
For most applications, V DISP (pin 19) can be connected
directly to DGND (pin 36). For applications with a wide
temperature range, some LCDs require that the drive
levels vary with temperature to maintain good viewing
angle and display contrast. Figure 4-6 shows two
circuits that can be adjusted to give temperature com-
pensation of about 10 mV/°C between V+ (pin 24) and
V DISP . The diode between DGND and V DISP should
have a low turn-on voltage because V DISP cannot
exceed 0.3V below DGND.
DS21459D-page 10
? 2006 Microchip Technology Inc.
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