71M6541DSLASHFSLASHG datasheet(147/166 Pages) MAXIM

147 / 166 page

71M6541D/F/G and 71M6542F/G Data Sheet

Rev 5

147

6.4.13 VLCD Generator

Table 108: LCD Driver Performance Specifications

Parameter

Condition

Min

Typ

Max

Unit

VSYS to VLCD switch impedance

V3P3 = 3.3 V,

RVLCD=removed, LCD_BAT=0,

LCD_VMODE[1:0]=0,

∆ILCD=10 µA

750

Ω

VBAT to VLCD switch impedance

V3P3 = 0 V, VBAT = 2.5 V,

RVLCD =removed, LCD_BAT =1,

LCD_VMODE[1:0]=0,

∆ILCD=10 µA

700

Ω

LCD Boost Frequency

LCD_VMODE[1:0] = 2,

RVLCD = removed,

CVLCD = removed

PLL_FAST=1

PLL_FAST=0

820

786

kHz

VLCD IOH current

(VLCD(0)-VLCD(IOH)<0.25)

LCD_VMODE[1:0] = 2,

LCD_CLK[1:0] = 2,

RVLCD = removed,

V3P3 = 3.3V,

LCD_DAC[4:0] = 1F

µA

From LCDADJ0 and LCDADJ12 fuses:

��(��_��)=5��0+��12−��0

12 ��_��

��(��_��)=2.65+2.65��_��31+��(��_��)

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

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

LCD_DAC Error. VLCD-VLCDnom

Zero Scale, with Boost

V3P3 = 3.6 V

V3P3 = 3.0 V

VBAT = 4.0 V, V3P3 = 0 V, BRN Mode

(see note 2)

VBAT = 2.5 V, V3P3 = 0 V, BRN Mode

LCD_VMODE[1:0] = 2,

LCD_DAC[4:0] =0,

LCD_CLK[1:0]=2,

LCD_MODE[2:0]=6

-0.15

0.15

LCD_DAC Error. VLCD-VLCDnom

Full Scale, no Boost

V3P3 = 3.6 V (see note 2)

V3P3 = 3.0 V (see note 2)

VBAT = 4.0 V, V3P3 = 0 V, BRN Mode

VBAT = 2.5 V, V3P3 = 0 V, BRN Mode

LCD_VMODE[1:0] = 1,

LCD_DAC[4:0] = 1F,

LCD_CLK[1:0]=2,

LCD_MODE[2:0]=6

-2.1

-2.8

-1.8

-3.2

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