71M6541D Datasheet, PDF (146/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
6.4.13 VLCD Generator
Table 108: LCD Driver Performance Specifications¹
Parameter
Condition
Min Typ Max Unit
V3P3 = 3.3 V,
VSYS to VLCD switch impedance
RVLCD=removed, LCD_BAT=0,
LCD_VMODE[1:0]=0,
750
Ω
∆ILCD=10 µA
V3P3 = 0 V, VBAT = 2.5 V,
VBAT to VLCD switch impedance
RVLCD =removed, LCD_BAT =1,
LCD_VMODE[1:0]=0,
700
Ω
∆ILCD=10 µA
LCD_VMODE[1:0] = 2,
RVLCD = removed,
LCD Boost Frequency
CVLCD = removed
PLL_FAST=1
820
kHz
PLL_FAST=0
786
kHz
LCD_VMODE[1:0] = 2,
VLCD IOH current
(VLCD(0)-VLCD(IOH)<0.25)
LCD_CLK[1:0] = 2,
RVLCD = removed,
V3P3 = 3.3V,
10
µA
LCD_DAC[4:0] = 1F
From LCDADJ0 and LCDADJ12 fuses:
𝐿𝐶𝐷𝐴𝐷𝐽(𝐿𝐶𝐷_𝐷𝐴𝐶)
=
5𝑚𝑉
�𝐿𝐶𝐷𝐴𝐷𝐽0
+
𝐿𝐶𝐷𝐴𝐷𝐽12 −
12
𝐿𝐶𝐷𝐴𝐷𝐽0
𝐿𝐶𝐷_𝐷𝐴𝐶�
𝐿𝐶𝐷_𝐷𝐴𝐶
𝑉𝐿𝐶𝐷_{𝑁𝑂𝑀}(𝐿𝐶𝐷_𝐷𝐴𝐶) = 2.65 + 2.65 ₃₁ + 𝐿𝐶𝐷𝐴𝐷𝐽(𝐿𝐶𝐷_𝐷𝐴𝐶)
The above equations describe the nominal value of VLCD for a specific LCD_DAC value. The
specifications below list the maximum deviation between actual VLCD and VLCDnom. Note that when
VCC and boost are insufficient, the LCD DAC will not reach its target value and a large negative error
will occur.
LCD_DAC Error. VLCD-VLCDnom
(see note 2)
Full Scale, with Boost
V3P3 =3.6 V
V3P3 =3.0 V
VBAT=4.0 V, V3P3=0, BRN Mode
VBAT=2.5 V, V3P3=0, BRN Mode
LCD_VMODE[1:0] = 2,
LCD_DAC[4:0] = 1F,
LCD_CLK[1:0]=2,
LCD_MODE[2:0]=6
-0.15
-0.4
-0.15
-1.3
0.15
V
0.15
V
0.15
V
V
LCD_DAC Error. VLCD-VLCDnom
DAC=12, with Boost
V3P3 = 3.6 V
V3P3 = 3.0 V
VBAT = 2.5 V, V3P3 = 0 V, BRN Mode
LCD_VMODE[1:0] = 2,
LCD_DAC[4:0] = C,
LCD_CLK[1:0]=2,
LCD_MODE[2:0]=6
-0.15
-0.15
-0.15
0.15
V
0.15
V
0.15
V
LCD_DAC Error. VLCD-VLCDnom
LCD_VMODE[1:0] = 2,
Zero Scale, with Boost
LCD_DAC[4:0] =0,
V3P3 = 3.6 V
LCD_CLK[1:0]=2,
V3P3 = 3.0 V
LCD_MODE[2:0]=6
VBAT = 4.0 V, V3P3 = 0 V, BRN Mode
(see note 2)
VBAT = 2.5 V, V3P3 = 0 V, BRN Mode
LCD_DAC Error. VLCD-VLCDnom
LCD_VMODE[1:0] = 1,
Full Scale, no Boost
LCD_DAC[4:0] = 1F,
V3P3 = 3.6 V (see note 2)
V3P3 = 3.0 V (see note 2)
LCD_CLK[1:0]=2,
LCD_MODE[2:0]=6
VBAT = 4.0 V, V3P3 = 0 V, BRN Mode
VBAT = 2.5 V, V3P3 = 0 V, BRN Mode
-0.15
-0.15
-0.15
-0.15
-2.1
-2.8
-1.8
-3.2
0.15
V
0.15
V
0.15
V
0.15
V
V
V
V
V