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参数资料
型号： ADE5166ASTZF62
厂商： Analog Devices Inc
文件页数： 106/156页
文件大小： 0K
描述： IC METER/8052/RTC/LCD DRV 64LQFP
产品变化通告： Product Discontinuance 27/Oct/2011
标准包装： 1
输入阻抗： *
测量误差： *
电压 - 高输入/输出： *
电压 - 低输入/输出： *
电流 - 电源： *
电源电压： *
测量仪表类型： *
工作温度： *
安装类型： 表面贴装
封装/外壳： 64-LQFP
供应商设备封装： 64-LQFP（10x10）
包装： 托盘
ADE5166/ADE5169/ADE5566/ADE5569
Data Sheet
Charge Pump
Voltage generation through the charge pump requires external
capacitors to store charge. The external connections to LCDVA,
?
?
?
Type of LCD: 5 V, 4× multiplexed with 1/3 bias, 96 segments
Voltage generation: internal charge pump
Refresh rate: 64 Hz
LCDVB, and LCDVC, as well as to LCDVP1 and LCDVP2, are
shown in Figure 90.
A 96-segment LCD with 4× multiplexing requires 96/4 = 24
segment lines. Sixteen pins, FP0 to FP15, are automatically
CHARGE PUMP
AND
LCD WAVEFORM
CIRCUITRY
LCDVC
LCDVB
LCDVA
LCDVP1
LCDVP2
100nF
470nF
470nF
470nF
dedicated for use as LCD segments. Eight more pins must be
chosen for the LCD function. Because the LCD has 4× multi-
plexing, all four common lines are used. As a result, COM2/FP28
and COM3/FP27 cannot be used as segment lines. Based on the
alternate functions of the pins used for FP16 through FP25, FP16 to
Figure 90. External Circuitry for Charge Pump Option
External Resistor Ladder
Set the EXTRES bit (Bit 6) in the LCD Configuration X SFR
(LCDCONX, Address 0x9C) to enable the external resistor ladder
option. When EXTRES = 1, the LCD waveform voltages are sup-
plied by the external resistor ladder. Because the LCD voltages
are not generated on chip, the LCD bias compensation that is
implemented to maintain contrast over temperature and supply
is not possible.
The external circuitry needed for the resistor ladder option is
shown in Figure 91. The resistors required should be in the range
of 10 k? to 100 k? and should be based on the current required
by the LCD being used.
LCDVC
FP23 are chosen for the eight remaining segment lines. These
pins are enabled for LCD functionality in the LCD segment
enable SFR (LCDSEGE, Address 0x97) and the LCD Segment
Enable 2 SFR (LCDSEGE2, Address 0xED).
To determine the contrast setting for this 5 V LCD, see Table 93
for the BIASLVL bit settings in the LCD Configuration X SFR
(LCDCONX, Address 0x9C) that correspond to a V C of 5 V in
1/3 bias mode. The maximum bias level setting for this LCD is
BIASLVL = 101110.
The LCD is set up with the following 8052 code:
; set up LCD pins to have LCD functionality
MOV LCDSEGE,#FP20EN+FP21EN+FP22EN+FP23EN
MOV LCDSEGE2,#FP16EN+FP17EN+FP18EN+FP19EN
; set up LCDCON for f LCDCLK = 2048Hz, 1/3 bias
LCD WAVEFORM
LCDVB
and 4x multiplexing
CIRCUITRY
LCDVA
MOV
LCDCON,#BIAS+LMUX1+LMUX0
LCDVP1
LCDVP2
Figure 91. External Circuitry for External Resistor Ladder Option
LCD FUNCTION IN PSM2 MODE
LCDPSM2 (Bit 4) and LCDEN (Bit 7) in the LCD configuration
SFR (LCDCON, Address 0x95) control the LCD functionality
; set up LCDCONX for charge pump and
BIASLVL[110111]
MOV
LCDCONX,#BIASLVL5+BIASLVL4+BIASLVL3+BI
ASLVL2+BIASLVL1+BIASLVL0
; set up refresh rate for 64Hz with f LCDCLK =
2048 Hz
in the PSM2 operating mode (see Table 103).
MOV
LCDCLK,#FD3+FD2+FD1+FD0
Note that the internal voltage reference must be enabled by set-
ting REF_BAT_EN (Bit 3) in the peripheral configuration SFR
(PERIPH, Address 0xF4) to allow LCD operation in PSM2
mode (see Table 20).
Table 103. Bits Controlling LCD Functionality in PSM2 Mode
LCDPSM2 LCDEN Result
0 0 The display is off in PSM2.
; set up LCD data registers with data to be
displayed using
; LCDPTR and LCDDAT registers
; turn all segments on FP27 ON
ORL LCDCONY,#01h ; start data memory
refresh
MOV LCDDAT,#F0H
0
1
1
X
The display is on in PSM2.
The display is off in PSM2.
MOV
ANL
LCDPTR, #80h OR 0DH
LCDCONY,#0FEh ; end of data memory
In addition, note that the LCD configuration and data memory
are retained when the display is turned off.
Example LCD Setup
An example of how to set up the LCD peripheral for a specific
LCD is described in this section with the following parameters:
refresh
ORL LCDCON,#LCDEN ; enable LCD
To set up the same 3.3 V LCD for use with an external resistor
ladder,
; setup LCDCONX for external resistor ladder
MOV LCDCONX,#EXTRES
Rev. D | Page 106 of 156
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