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参数资料
| 型号： | 71M6543F-IGT/F |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP100 |
| 封装： | LEAD FREE, LQFP-100 |
| 文件页数： | 118/157页 |
| 文件大小： | 2178K |
| 代理商： | 71M6543F-IGT/F |
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71M6543F/H and 71M6543G/GH Data Sheet
v1.2
2008–2011 Teridian Semiconductor Corporation
63
Table 52: LCD_VMODE Configurations
LCD_VMODE[1:0] LCD_EXT LDAC_E LCD_BSTE Description
11
1
0
External VLCD connected to the VLCD pin.
10
0
1
LCD boost is enabled. Maximum VLCD voltage is
2*V3P3L-1.
VLCD = max(2*V3P3L-1, 2.65(1+LCD_DAC[4:0]/31)
01
0
1
0
LCD boost is disabled. The maximum VLCD
voltage is V3P3L.
VLCD = max(V3P3L, 2.65(1+LCD_DAC[4:0]/31)
00
0
VLCD=V3P3L, the LCD DAC and LCD boost are dis-
abled. In LCD mode, this setting causes the lowest
battery current.
Notes:
1.
LCD_EXT, LDAC_E and LCD_BSTE are 71M6543 internal signals which are decoded from
the LCD_VMODE[1:0] control field setting (I/O RAM 0x2401[7:6]). Each of these decoded signals,
when asserted, has the effect indicated in the description column above, and as summarized
below.
LCD_EXT : When set, the VLCD pin expects an external supply voltage
LDAC_E : When set, LCD DAC is enabled
LCD_BSTE : When set, the LCD boost circuit is enabled
2.
V3P3L is an internal supply rail that is supplied from either the VBAT pin or the V3P3SYS pin,
depending on the V3P3SYS pin voltage. When the V3P3SYS pin drops below 3.0 VDC, the
71M6543 switches to BRN mode and V3P3L is sourced from the VBAT pin, otherwise V3P3L
is sourced from the V3P3SYS pin while in MSN mode.
When using the VLCD boost circuit, use care when setting the LCD_DAC[4:0] (I/O RAM 0x240D[4:0])
value to ensure that the LCD manufacturer’s recommended operating voltage specification is not
exceeded.
The voltage doubler is active in all LCD modes including the LCD mode when LCD_BSTE = 1. Current
dissipation in LCD mode can be reduced if the boost circuit is disabled and the LCD system is operated
directly from VBAT.
The LCD DAC uses a low-power reference and, within the constraints of VBAT and the voltage doubler,
generates a VLCD voltage of 2.65 VDC + 2.65 * LCD_DAC[4:0]/31. Two fuse bytes increase the accuracy
of the LCD_DAC. LCDADJ12 and LCDADJ0 indicate the actual VLCD output voltage when the DAC is
programmed to 12 and 0 respectively.
The LCD_BAT (I/O RAM 0x2402[7]) bit causes the LCD system to use the battery voltage in all power
modes. This may be useful when an external supply is available for the LCD system. The advantage of
connecting the external supply to VBAT, rather than VLCD is that the LCD DAC is still active.
If LCD_EXT = 1, the VLCD pin must be driven from an external source. In this case, the LCD DAC has
no effect.
The LCD system has the ability to drive up to six segments per SEG driver. If the display is configured with
six back planes, the 6-way multiplexing reduces the number of SEG pins required to drive a display and
therefore enhances the number of DIO pins available to the application. Refer to the LCD_MODE[2:0] field
(I/O RAM 0x2400[6:4]) settings (Table 53) for the different LCD multiplexing choices. If 5-state multiplexing
is selected, SEGDIO27 is converted to COM4. If 6-state multiplexing is selected, SEGDIO26 is converted
to COM5. These conversions override the SEG/DIO mapping of SEGDIO26 and SEGDIO27. Additionally,
independent of LCD_MODE[2:0], if LCD_ALLCOM = 1 (I/O RAM 0x2400[3]), then SEGDIO26 and
SEGDIO27 become COM4 and COM5 if their LCD_MAP[ ] bits are set.
The LCD_ON (I/O RAM 0x240C[0]) and LCD_BLANK (I/O RAM 0x240C[1]) bits are an easy way to either
blank the LCD display or turn it fully on. Neither bit affects the contents of the LCD data stored in the
LCDSEG_DIO[ ] registers. In comparison, LCD_RST (I/O RAM 0x240C[2]) clears all LCD data to zero.
LCD_RST affects only pins that are configured as LCD.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 71M6543F-IGTR/F | 功能描述:计量片上系统 - SoC Precision Energy Meter IC RoHS:否 制造商:Maxim Integrated 核心:80515 MPU 处理器系列:71M6511 类型:Metering SoC 最大时钟频率:70 Hz 程序存储器大小:64 KB 数据 RAM 大小:7 KB 接口类型:UART 可编程输入/输出端数量:12 片上 ADC: 安装风格:SMD/SMT 封装 / 箱体:LQFP-64 封装:Reel |
| 71M6543FT-IGT/F | 制造商:Maxim Integrated Products 功能描述:ENERGY METER ICS - Rail/Tube |
| 71M6543FT-IGTR/F | 制造商:Maxim Integrated Products 功能描述:3-PHASE SOC, 64KB FLASH, PRES TEMP SENSOR - Tape and Reel |
| 71M6543G | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation |
| 71M6543GH | 制造商:未知厂家 制造商全称:未知厂家 功能描述:电表IC |
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